Doug / smarc-fsl-linux-kernel

slub.c 112 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 
/*
 * SLUB: A slab allocator that limits cache line use instead of queuing
 * objects in per cpu and per node lists.
 *
 * The allocator synchronizes using per slab locks and only
 * uses a centralized lock to manage a pool of partial slabs.
 *
 * (C) 2007 SGI, Christoph Lameter
 */

#include <linux/mm.h>
#include <linux/swap.h> /* struct reclaim_state */
#include <linux/module.h>
#include <linux/bit_spinlock.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kmemtrace.h>
#include <linux/kmemcheck.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/mempolicy.h>
#include <linux/ctype.h>
#include <linux/debugobjects.h>
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/math64.h>
#include <linux/fault-inject.h>

/*
 * Lock order:
 *   1. slab_lock(page)
 *   2. slab->list_lock
 *
 *   The slab_lock protects operations on the object of a particular
 *   slab and its metadata in the page struct. If the slab lock
 *   has been taken then no allocations nor frees can be performed
 *   on the objects in the slab nor can the slab be added or removed
 *   from the partial or full lists since this would mean modifying
 *   the page_struct of the slab.
 *
 *   The list_lock protects the partial and full list on each node and
 *   the partial slab counter. If taken then no new slabs may be added or
 *   removed from the lists nor make the number of partial slabs be modified.
 *   (Note that the total number of slabs is an atomic value that may be
 *   modified without taking the list lock).
 *
 *   The list_lock is a centralized lock and thus we avoid taking it as
 *   much as possible. As long as SLUB does not have to handle partial
 *   slabs, operations can continue without any centralized lock. F.e.
 *   allocating a long series of objects that fill up slabs does not require
 *   the list lock.
 *
 *   The lock order is sometimes inverted when we are trying to get a slab
 *   off a list. We take the list_lock and then look for a page on the list
 *   to use. While we do that objects in the slabs may be freed. We can
 *   only operate on the slab if we have also taken the slab_lock. So we use
 *   a slab_trylock() on the slab. If trylock was successful then no frees
 *   can occur anymore and we can use the slab for allocations etc. If the
 *   slab_trylock() does not succeed then frees are in progress in the slab and
 *   we must stay away from it for a while since we may cause a bouncing
 *   cacheline if we try to acquire the lock. So go onto the next slab.
 *   If all pages are busy then we may allocate a new slab instead of reusing
 *   a partial slab. A new slab has noone operating on it and thus there is
 *   no danger of cacheline contention.
 *
 *   Interrupts are disabled during allocation and deallocation in order to
 *   make the slab allocator safe to use in the context of an irq. In addition
 *   interrupts are disabled to ensure that the processor does not change
 *   while handling per_cpu slabs, due to kernel preemption.
 *
 * SLUB assigns one slab for allocation to each processor.
 * Allocations only occur from these slabs called cpu slabs.
 *
 * Slabs with free elements are kept on a partial list and during regular
 * operations no list for full slabs is used. If an object in a full slab is
 * freed then the slab will show up again on the partial lists.
 * We track full slabs for debugging purposes though because otherwise we
 * cannot scan all objects.
 *
 * Slabs are freed when they become empty. Teardown and setup is
 * minimal so we rely on the page allocators per cpu caches for
 * fast frees and allocs.
 *
 * Overloading of page flags that are otherwise used for LRU management.
 *
 * PageActive 		The slab is frozen and exempt from list processing.
 * 			This means that the slab is dedicated to a purpose
 * 			such as satisfying allocations for a specific
 * 			processor. Objects may be freed in the slab while
 * 			it is frozen but slab_free will then skip the usual
 * 			list operations. It is up to the processor holding
 * 			the slab to integrate the slab into the slab lists
 * 			when the slab is no longer needed.
 *
 * 			One use of this flag is to mark slabs that are
 * 			used for allocations. Then such a slab becomes a cpu
 * 			slab. The cpu slab may be equipped with an additional
 * 			freelist that allows lockless access to
 * 			free objects in addition to the regular freelist
 * 			that requires the slab lock.
 *
 * PageError		Slab requires special handling due to debug
 * 			options set. This moves	slab handling out of
 * 			the fast path and disables lockless freelists.
 */

#ifdef CONFIG_SLUB_DEBUG
#define SLABDEBUG 1
#else
#define SLABDEBUG 0
#endif

/*
 * Issues still to be resolved:
 *
 * - Support PAGE_ALLOC_DEBUG. Should be easy to do.
 *
 * - Variable sizing of the per node arrays
 */

/* Enable to test recovery from slab corruption on boot */
#undef SLUB_RESILIENCY_TEST

/*
 * Mininum number of partial slabs. These will be left on the partial
 * lists even if they are empty. kmem_cache_shrink may reclaim them.
 */
#define MIN_PARTIAL 5

/*
 * Maximum number of desirable partial slabs.
 * The existence of more partial slabs makes kmem_cache_shrink
 * sort the partial list by the number of objects in the.
 */
#define MAX_PARTIAL 10

#define DEBUG_DEFAULT_FLAGS (SLAB_DEBUG_FREE | SLAB_RED_ZONE | \
				SLAB_POISON | SLAB_STORE_USER)

/*
 * Debugging flags that require metadata to be stored in the slab.  These get
 * disabled when slub_debug=O is used and a cache's min order increases with
 * metadata.
 */
#define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)

/*
 * Set of flags that will prevent slab merging
 */
#define SLUB_NEVER_MERGE (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
		SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE)

#define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \
		SLAB_CACHE_DMA | SLAB_NOTRACK)

#ifndef ARCH_KMALLOC_MINALIGN
#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
#endif

#ifndef ARCH_SLAB_MINALIGN
#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
#endif

#define OO_SHIFT	16
#define OO_MASK		((1 << OO_SHIFT) - 1)
#define MAX_OBJS_PER_PAGE	65535 /* since page.objects is u16 */

/* Internal SLUB flags */
#define __OBJECT_POISON		0x80000000 /* Poison object */
#define __SYSFS_ADD_DEFERRED	0x40000000 /* Not yet visible via sysfs */

static int kmem_size = sizeof(struct kmem_cache);

#ifdef CONFIG_SMP
static struct notifier_block slab_notifier;
#endif

static enum {
	DOWN,		/* No slab functionality available */
	PARTIAL,	/* kmem_cache_open() works but kmalloc does not */
	UP,		/* Everything works but does not show up in sysfs */
	SYSFS		/* Sysfs up */
} slab_state = DOWN;

/* A list of all slab caches on the system */
static DECLARE_RWSEM(slub_lock);
static LIST_HEAD(slab_caches);

/*
 * Tracking user of a slab.
 */
struct track {
	unsigned long addr;	/* Called from address */
	int cpu;		/* Was running on cpu */
	int pid;		/* Pid context */
	unsigned long when;	/* When did the operation occur */
};

enum track_item { TRACK_ALLOC, TRACK_FREE };

#ifdef CONFIG_SLUB_DEBUG
static int sysfs_slab_add(struct kmem_cache *);
static int sysfs_slab_alias(struct kmem_cache *, const char *);
static void sysfs_slab_remove(struct kmem_cache *);

#else
static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
							{ return 0; }
static inline void sysfs_slab_remove(struct kmem_cache *s)
{
	kfree(s);
}

#endif

static inline void stat(struct kmem_cache_cpu *c, enum stat_item si)
{
#ifdef CONFIG_SLUB_STATS
	c->stat[si]++;
#endif
}

/********************************************************************
 * 			Core slab cache functions
 *******************************************************************/

int slab_is_available(void)
{
	return slab_state >= UP;
}

static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
{
#ifdef CONFIG_NUMA
	return s->node[node];
#else
	return &s->local_node;
#endif
}

static inline struct kmem_cache_cpu *get_cpu_slab(struct kmem_cache *s, int cpu)
{
#ifdef CONFIG_SMP
	return s->cpu_slab[cpu];
#else
	return &s->cpu_slab;
#endif
}

/* Verify that a pointer has an address that is valid within a slab page */
static inline int check_valid_pointer(struct kmem_cache *s,
				struct page *page, const void *object)
{
	void *base;

	if (!object)
		return 1;

	base = page_address(page);
	if (object < base || object >= base + page->objects * s->size ||
		(object - base) % s->size) {
		return 0;
	}

	return 1;
}

/*
 * Slow version of get and set free pointer.
 *
 * This version requires touching the cache lines of kmem_cache which
 * we avoid to do in the fast alloc free paths. There we obtain the offset
 * from the page struct.
 */
static inline void *get_freepointer(struct kmem_cache *s, void *object)
{
	return *(void **)(object + s->offset);
}

static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp)
{
	*(void **)(object + s->offset) = fp;
}

/* Loop over all objects in a slab */
#define for_each_object(__p, __s, __addr, __objects) \
	for (__p = (__addr); __p < (__addr) + (__objects) * (__s)->size;\
			__p += (__s)->size)

/* Scan freelist */
#define for_each_free_object(__p, __s, __free) \
	for (__p = (__free); __p; __p = get_freepointer((__s), __p))

/* Determine object index from a given position */
static inline int slab_index(void *p, struct kmem_cache *s, void *addr)
{
	return (p - addr) / s->size;
}

static inline struct kmem_cache_order_objects oo_make(int order,
						unsigned long size)
{
	struct kmem_cache_order_objects x = {
		(order << OO_SHIFT) + (PAGE_SIZE << order) / size
	};

	return x;
}

static inline int oo_order(struct kmem_cache_order_objects x)
{
	return x.x >> OO_SHIFT;
}

static inline int oo_objects(struct kmem_cache_order_objects x)
{
	return x.x & OO_MASK;
}

#ifdef CONFIG_SLUB_DEBUG
/*
 * Debug settings:
 */
#ifdef CONFIG_SLUB_DEBUG_ON
static int slub_debug = DEBUG_DEFAULT_FLAGS;
#else
static int slub_debug;
#endif

static char *slub_debug_slabs;
static int disable_higher_order_debug;

/*
 * Object debugging
 */
static void print_section(char *text, u8 *addr, unsigned int length)
{
	int i, offset;
	int newline = 1;
	char ascii[17];

	ascii[16] = 0;

	for (i = 0; i < length; i++) {
		if (newline) {
			printk(KERN_ERR "%8s 0x%p: ", text, addr + i);
			newline = 0;
		}
		printk(KERN_CONT " %02x", addr[i]);
		offset = i % 16;
		ascii[offset] = isgraph(addr[i]) ? addr[i] : '.';
		if (offset == 15) {
			printk(KERN_CONT " %s\n", ascii);
			newline = 1;
		}
	}
	if (!newline) {
		i %= 16;
		while (i < 16) {
			printk(KERN_CONT "   ");
			ascii[i] = ' ';
			i++;
		}
		printk(KERN_CONT " %s\n", ascii);
	}
}

static struct track *get_track(struct kmem_cache *s, void *object,
	enum track_item alloc)
{
	struct track *p;

	if (s->offset)
		p = object + s->offset + sizeof(void *);
	else
		p = object + s->inuse;

	return p + alloc;
}

static void set_track(struct kmem_cache *s, void *object,
			enum track_item alloc, unsigned long addr)
{
	struct track *p = get_track(s, object, alloc);

	if (addr) {
		p->addr = addr;
		p->cpu = smp_processor_id();
		p->pid = current->pid;
		p->when = jiffies;
	} else
		memset(p, 0, sizeof(struct track));
}

static void init_tracking(struct kmem_cache *s, void *object)
{
	if (!(s->flags & SLAB_STORE_USER))
		return;

	set_track(s, object, TRACK_FREE, 0UL);
	set_track(s, object, TRACK_ALLOC, 0UL);
}

static void print_track(const char *s, struct track *t)
{
	if (!t->addr)
		return;

	printk(KERN_ERR "INFO: %s in %pS age=%lu cpu=%u pid=%d\n",
		s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid);
}

static void print_tracking(struct kmem_cache *s, void *object)
{
	if (!(s->flags & SLAB_STORE_USER))
		return;

	print_track("Allocated", get_track(s, object, TRACK_ALLOC));
	print_track("Freed", get_track(s, object, TRACK_FREE));
}

static void print_page_info(struct page *page)
{
	printk(KERN_ERR "INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n",
		page, page->objects, page->inuse, page->freelist, page->flags);

}

static void slab_bug(struct kmem_cache *s, char *fmt, ...)
{
	va_list args;
	char buf[100];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	printk(KERN_ERR "========================================"
			"=====================================\n");
	printk(KERN_ERR "BUG %s: %s\n", s->name, buf);
	printk(KERN_ERR "----------------------------------------"
			"-------------------------------------\n\n");
}

static void slab_fix(struct kmem_cache *s, char *fmt, ...)
{
	va_list args;
	char buf[100];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	printk(KERN_ERR "FIX %s: %s\n", s->name, buf);
}

static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
{
	unsigned int off;	/* Offset of last byte */
	u8 *addr = page_address(page);

	print_tracking(s, p);

	print_page_info(page);

	printk(KERN_ERR "INFO: Object 0x%p @offset=%tu fp=0x%p\n\n",
			p, p - addr, get_freepointer(s, p));

	if (p > addr + 16)
		print_section("Bytes b4", p - 16, 16);

	print_section("Object", p, min_t(unsigned long, s->objsize, PAGE_SIZE));

	if (s->flags & SLAB_RED_ZONE)
		print_section("Redzone", p + s->objsize,
			s->inuse - s->objsize);

	if (s->offset)
		off = s->offset + sizeof(void *);
	else
		off = s->inuse;

	if (s->flags & SLAB_STORE_USER)
		off += 2 * sizeof(struct track);

	if (off != s->size)
		/* Beginning of the filler is the free pointer */
		print_section("Padding", p + off, s->size - off);

	dump_stack();
}

static void object_err(struct kmem_cache *s, struct page *page,
			u8 *object, char *reason)
{
	slab_bug(s, "%s", reason);
	print_trailer(s, page, object);
}

static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...)
{
	va_list args;
	char buf[100];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);
	slab_bug(s, "%s", buf);
	print_page_info(page);
	dump_stack();
}

static void init_object(struct kmem_cache *s, void *object, int active)
{
	u8 *p = object;

	if (s->flags & __OBJECT_POISON) {
		memset(p, POISON_FREE, s->objsize - 1);
		p[s->objsize - 1] = POISON_END;
	}

	if (s->flags & SLAB_RED_ZONE)
		memset(p + s->objsize,
			active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE,
			s->inuse - s->objsize);
}

static u8 *check_bytes(u8 *start, unsigned int value, unsigned int bytes)
{
	while (bytes) {
		if (*start != (u8)value)
			return start;
		start++;
		bytes--;
	}
	return NULL;
}

static void restore_bytes(struct kmem_cache *s, char *message, u8 data,
						void *from, void *to)
{
	slab_fix(s, "Restoring 0x%p-0x%p=0x%x\n", from, to - 1, data);
	memset(from, data, to - from);
}

static int check_bytes_and_report(struct kmem_cache *s, struct page *page,
			u8 *object, char *what,
			u8 *start, unsigned int value, unsigned int bytes)
{
	u8 *fault;
	u8 *end;

	fault = check_bytes(start, value, bytes);
	if (!fault)
		return 1;

	end = start + bytes;
	while (end > fault && end[-1] == value)
		end--;

	slab_bug(s, "%s overwritten", what);
	printk(KERN_ERR "INFO: 0x%p-0x%p. First byte 0x%x instead of 0x%x\n",
					fault, end - 1, fault[0], value);
	print_trailer(s, page, object);

	restore_bytes(s, what, value, fault, end);
	return 0;
}

/*
 * Object layout:
 *
 * object address
 * 	Bytes of the object to be managed.
 * 	If the freepointer may overlay the object then the free
 * 	pointer is the first word of the object.
 *
 * 	Poisoning uses 0x6b (POISON_FREE) and the last byte is
 * 	0xa5 (POISON_END)
 *
 * object + s->objsize
 * 	Padding to reach word boundary. This is also used for Redzoning.
 * 	Padding is extended by another word if Redzoning is enabled and
 * 	objsize == inuse.
 *
 * 	We fill with 0xbb (RED_INACTIVE) for inactive objects and with
 * 	0xcc (RED_ACTIVE) for objects in use.
 *
 * object + s->inuse
 * 	Meta data starts here.
 *
 * 	A. Free pointer (if we cannot overwrite object on free)
 * 	B. Tracking data for SLAB_STORE_USER
 * 	C. Padding to reach required alignment boundary or at mininum
 * 		one word if debugging is on to be able to detect writes
 * 		before the word boundary.
 *
 *	Padding is done using 0x5a (POISON_INUSE)
 *
 * object + s->size
 * 	Nothing is used beyond s->size.
 *
 * If slabcaches are merged then the objsize and inuse boundaries are mostly
 * ignored. And therefore no slab options that rely on these boundaries
 * may be used with merged slabcaches.
 */

static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p)
{
	unsigned long off = s->inuse;	/* The end of info */

	if (s->offset)
		/* Freepointer is placed after the object. */
		off += sizeof(void *);

	if (s->flags & SLAB_STORE_USER)
		/* We also have user information there */
		off += 2 * sizeof(struct track);

	if (s->size == off)
		return 1;

	return check_bytes_and_report(s, page, p, "Object padding",
				p + off, POISON_INUSE, s->size - off);
}

/* Check the pad bytes at the end of a slab page */
static int slab_pad_check(struct kmem_cache *s, struct page *page)
{
	u8 *start;
	u8 *fault;
	u8 *end;
	int length;
	int remainder;

	if (!(s->flags & SLAB_POISON))
		return 1;

	start = page_address(page);
	length = (PAGE_SIZE << compound_order(page));
	end = start + length;
	remainder = length % s->size;
	if (!remainder)
		return 1;

	fault = check_bytes(end - remainder, POISON_INUSE, remainder);
	if (!fault)
		return 1;
	while (end > fault && end[-1] == POISON_INUSE)
		end--;

	slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
	print_section("Padding", end - remainder, remainder);

	restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end);
	return 0;
}

static int check_object(struct kmem_cache *s, struct page *page,
					void *object, int active)
{
	u8 *p = object;
	u8 *endobject = object + s->objsize;

	if (s->flags & SLAB_RED_ZONE) {
		unsigned int red =
			active ? SLUB_RED_ACTIVE : SLUB_RED_INACTIVE;

		if (!check_bytes_and_report(s, page, object, "Redzone",
			endobject, red, s->inuse - s->objsize))
			return 0;
	} else {
		if ((s->flags & SLAB_POISON) && s->objsize < s->inuse) {
			check_bytes_and_report(s, page, p, "Alignment padding",
				endobject, POISON_INUSE, s->inuse - s->objsize);
		}
	}

	if (s->flags & SLAB_POISON) {
		if (!active && (s->flags & __OBJECT_POISON) &&
			(!check_bytes_and_report(s, page, p, "Poison", p,
					POISON_FREE, s->objsize - 1) ||
			 !check_bytes_and_report(s, page, p, "Poison",
				p + s->objsize - 1, POISON_END, 1)))
			return 0;
		/*
		 * check_pad_bytes cleans up on its own.
		 */
		check_pad_bytes(s, page, p);
	}

	if (!s->offset && active)
		/*
		 * Object and freepointer overlap. Cannot check
		 * freepointer while object is allocated.
		 */
		return 1;

	/* Check free pointer validity */
	if (!check_valid_pointer(s, page, get_freepointer(s, p))) {
		object_err(s, page, p, "Freepointer corrupt");
		/*
		 * No choice but to zap it and thus lose the remainder
		 * of the free objects in this slab. May cause
		 * another error because the object count is now wrong.
		 */
		set_freepointer(s, p, NULL);
		return 0;
	}
	return 1;
}

static int check_slab(struct kmem_cache *s, struct page *page)
{
	int maxobj;

	VM_BUG_ON(!irqs_disabled());

	if (!PageSlab(page)) {
		slab_err(s, page, "Not a valid slab page");
		return 0;
	}

	maxobj = (PAGE_SIZE << compound_order(page)) / s->size;
	if (page->objects > maxobj) {
		slab_err(s, page, "objects %u > max %u",
			s->name, page->objects, maxobj);
		return 0;
	}
	if (page->inuse > page->objects) {
		slab_err(s, page, "inuse %u > max %u",
			s->name, page->inuse, page->objects);
		return 0;
	}
	/* Slab_pad_check fixes things up after itself */
	slab_pad_check(s, page);
	return 1;
}

/*
 * Determine if a certain object on a page is on the freelist. Must hold the
 * slab lock to guarantee that the chains are in a consistent state.
 */
static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
{
	int nr = 0;
	void *fp = page->freelist;
	void *object = NULL;
	unsigned long max_objects;

	while (fp && nr <= page->objects) {
		if (fp == search)
			return 1;
		if (!check_valid_pointer(s, page, fp)) {
			if (object) {
				object_err(s, page, object,
					"Freechain corrupt");
				set_freepointer(s, object, NULL);
				break;
			} else {
				slab_err(s, page, "Freepointer corrupt");
				page->freelist = NULL;
				page->inuse = page->objects;
				slab_fix(s, "Freelist cleared");
				return 0;
			}
			break;
		}
		object = fp;
		fp = get_freepointer(s, object);
		nr++;
	}

	max_objects = (PAGE_SIZE << compound_order(page)) / s->size;
	if (max_objects > MAX_OBJS_PER_PAGE)
		max_objects = MAX_OBJS_PER_PAGE;

	if (page->objects != max_objects) {
		slab_err(s, page, "Wrong number of objects. Found %d but "
			"should be %d", page->objects, max_objects);
		page->objects = max_objects;
		slab_fix(s, "Number of objects adjusted.");
	}
	if (page->inuse != page->objects - nr) {
		slab_err(s, page, "Wrong object count. Counter is %d but "
			"counted were %d", page->inuse, page->objects - nr);
		page->inuse = page->objects - nr;
		slab_fix(s, "Object count adjusted.");
	}
	return search == NULL;
}

static void trace(struct kmem_cache *s, struct page *page, void *object,
								int alloc)
{
	if (s->flags & SLAB_TRACE) {
		printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n",
			s->name,
			alloc ? "alloc" : "free",
			object, page->inuse,
			page->freelist);

		if (!alloc)
			print_section("Object", (void *)object, s->objsize);

		dump_stack();
	}
}

/*
 * Tracking of fully allocated slabs for debugging purposes.
 */
static void add_full(struct kmem_cache_node *n, struct page *page)
{
	spin_lock(&n->list_lock);
	list_add(&page->lru, &n->full);
	spin_unlock(&n->list_lock);
}

static void remove_full(struct kmem_cache *s, struct page *page)
{
	struct kmem_cache_node *n;

	if (!(s->flags & SLAB_STORE_USER))
		return;

	n = get_node(s, page_to_nid(page));

	spin_lock(&n->list_lock);
	list_del(&page->lru);
	spin_unlock(&n->list_lock);
}

/* Tracking of the number of slabs for debugging purposes */
static inline unsigned long slabs_node(struct kmem_cache *s, int node)
{
	struct kmem_cache_node *n = get_node(s, node);

	return atomic_long_read(&n->nr_slabs);
}

static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
{
	return atomic_long_read(&n->nr_slabs);
}

static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects)
{
	struct kmem_cache_node *n = get_node(s, node);

	/*
	 * May be called early in order to allocate a slab for the
	 * kmem_cache_node structure. Solve the chicken-egg
	 * dilemma by deferring the increment of the count during
	 * bootstrap (see early_kmem_cache_node_alloc).
	 */
	if (!NUMA_BUILD || n) {
		atomic_long_inc(&n->nr_slabs);
		atomic_long_add(objects, &n->total_objects);
	}
}
static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects)
{
	struct kmem_cache_node *n = get_node(s, node);

	atomic_long_dec(&n->nr_slabs);
	atomic_long_sub(objects, &n->total_objects);
}

/* Object debug checks for alloc/free paths */
static void setup_object_debug(struct kmem_cache *s, struct page *page,
								void *object)
{
	if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON)))
		return;

	init_object(s, object, 0);
	init_tracking(s, object);
}

static int alloc_debug_processing(struct kmem_cache *s, struct page *page,
					void *object, unsigned long addr)
{
	if (!check_slab(s, page))
		goto bad;

	if (!on_freelist(s, page, object)) {
		object_err(s, page, object, "Object already allocated");
		goto bad;
	}

	if (!check_valid_pointer(s, page, object)) {
		object_err(s, page, object, "Freelist Pointer check fails");
		goto bad;
	}

	if (!check_object(s, page, object, 0))
		goto bad;

	/* Success perform special debug activities for allocs */
	if (s->flags & SLAB_STORE_USER)
		set_track(s, object, TRACK_ALLOC, addr);
	trace(s, page, object, 1);
	init_object(s, object, 1);
	return 1;

bad:
	if (PageSlab(page)) {
		/*
		 * If this is a slab page then lets do the best we can
		 * to avoid issues in the future. Marking all objects
		 * as used avoids touching the remaining objects.
		 */
		slab_fix(s, "Marking all objects used");
		page->inuse = page->objects;
		page->freelist = NULL;
	}
	return 0;
}

static int free_debug_processing(struct kmem_cache *s, struct page *page,
					void *object, unsigned long addr)
{
	if (!check_slab(s, page))
		goto fail;

	if (!check_valid_pointer(s, page, object)) {
		slab_err(s, page, "Invalid object pointer 0x%p", object);
		goto fail;
	}

	if (on_freelist(s, page, object)) {
		object_err(s, page, object, "Object already free");
		goto fail;
	}

	if (!check_object(s, page, object, 1))
		return 0;

	if (unlikely(s != page->slab)) {
		if (!PageSlab(page)) {
			slab_err(s, page, "Attempt to free object(0x%p) "
				"outside of slab", object);
		} else if (!page->slab) {
			printk(KERN_ERR
				"SLUB <none>: no slab for object 0x%p.\n",
						object);
			dump_stack();
		} else
			object_err(s, page, object,
					"page slab pointer corrupt.");
		goto fail;
	}

	/* Special debug activities for freeing objects */
	if (!PageSlubFrozen(page) && !page->freelist)
		remove_full(s, page);
	if (s->flags & SLAB_STORE_USER)
		set_track(s, object, TRACK_FREE, addr);
	trace(s, page, object, 0);
	init_object(s, object, 0);
	return 1;

fail:
	slab_fix(s, "Object at 0x%p not freed", object);
	return 0;
}

static int __init setup_slub_debug(char *str)
{
	slub_debug = DEBUG_DEFAULT_FLAGS;
	if (*str++ != '=' || !*str)
		/*
		 * No options specified. Switch on full debugging.
		 */
		goto out;

	if (*str == ',')
		/*
		 * No options but restriction on slabs. This means full
		 * debugging for slabs matching a pattern.
		 */
		goto check_slabs;

	if (tolower(*str) == 'o') {
		/*
		 * Avoid enabling debugging on caches if its minimum order
		 * would increase as a result.
		 */
		disable_higher_order_debug = 1;
		goto out;
	}

	slub_debug = 0;
	if (*str == '-')
		/*
		 * Switch off all debugging measures.
		 */
		goto out;

	/*
	 * Determine which debug features should be switched on
	 */
	for (; *str && *str != ','; str++) {
		switch (tolower(*str)) {
		case 'f':
			slub_debug |= SLAB_DEBUG_FREE;
			break;
		case 'z':
			slub_debug |= SLAB_RED_ZONE;
			break;
		case 'p':
			slub_debug |= SLAB_POISON;
			break;
		case 'u':
			slub_debug |= SLAB_STORE_USER;
			break;
		case 't':
			slub_debug |= SLAB_TRACE;
			break;
		default:
			printk(KERN_ERR "slub_debug option '%c' "
				"unknown. skipped\n", *str);
		}
	}

check_slabs:
	if (*str == ',')
		slub_debug_slabs = str + 1;
out:
	return 1;
}

__setup("slub_debug", setup_slub_debug);

static unsigned long kmem_cache_flags(unsigned long objsize,
	unsigned long flags, const char *name,
	void (*ctor)(void *))
{
	/*
	 * Enable debugging if selected on the kernel commandline.
	 */
	if (slub_debug && (!slub_debug_slabs ||
		!strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs))))
		flags |= slub_debug;

	return flags;
}
#else
static inline void setup_object_debug(struct kmem_cache *s,
			struct page *page, void *object) {}

static inline int alloc_debug_processing(struct kmem_cache *s,
	struct page *page, void *object, unsigned long addr) { return 0; }

static inline int free_debug_processing(struct kmem_cache *s,
	struct page *page, void *object, unsigned long addr) { return 0; }

static inline int slab_pad_check(struct kmem_cache *s, struct page *page)
			{ return 1; }
static inline int check_object(struct kmem_cache *s, struct page *page,
			void *object, int active) { return 1; }
static inline void add_full(struct kmem_cache_node *n, struct page *page) {}
static inline unsigned long kmem_cache_flags(unsigned long objsize,
	unsigned long flags, const char *name,
	void (*ctor)(void *))
{
	return flags;
}
#define slub_debug 0

#define disable_higher_order_debug 0

static inline unsigned long slabs_node(struct kmem_cache *s, int node)
							{ return 0; }
static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
							{ return 0; }
static inline void inc_slabs_node(struct kmem_cache *s, int node,
							int objects) {}
static inline void dec_slabs_node(struct kmem_cache *s, int node,
							int objects) {}
#endif

/*
 * Slab allocation and freeing
 */
static inline struct page *alloc_slab_page(gfp_t flags, int node,
					struct kmem_cache_order_objects oo)
{
	int order = oo_order(oo);

	flags |= __GFP_NOTRACK;

	if (node == -1)
		return alloc_pages(flags, order);
	else
		return alloc_pages_node(node, flags, order);
}

static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
{
	struct page *page;
	struct kmem_cache_order_objects oo = s->oo;
	gfp_t alloc_gfp;

	flags |= s->allocflags;

	/*
	 * Let the initial higher-order allocation fail under memory pressure
	 * so we fall-back to the minimum order allocation.
	 */
	alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL;

	page = alloc_slab_page(alloc_gfp, node, oo);
	if (unlikely(!page)) {
		oo = s->min;
		/*
		 * Allocation may have failed due to fragmentation.
		 * Try a lower order alloc if possible
		 */
		page = alloc_slab_page(flags, node, oo);
		if (!page)
			return NULL;

		stat(get_cpu_slab(s, raw_smp_processor_id()), ORDER_FALLBACK);
	}

	if (kmemcheck_enabled
		&& !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS))) {
		int pages = 1 << oo_order(oo);

		kmemcheck_alloc_shadow(page, oo_order(oo), flags, node);

		/*
		 * Objects from caches that have a constructor don't get
		 * cleared when they're allocated, so we need to do it here.
		 */
		if (s->ctor)
			kmemcheck_mark_uninitialized_pages(page, pages);
		else
			kmemcheck_mark_unallocated_pages(page, pages);
	}

	page->objects = oo_objects(oo);
	mod_zone_page_state(page_zone(page),
		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
		1 << oo_order(oo));

	return page;
}

static void setup_object(struct kmem_cache *s, struct page *page,
				void *object)
{
	setup_object_debug(s, page, object);
	if (unlikely(s->ctor))
		s->ctor(object);
}

static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
{
	struct page *page;
	void *start;
	void *last;
	void *p;

	BUG_ON(flags & GFP_SLAB_BUG_MASK);

	page = allocate_slab(s,
		flags & (GFP_RECLAIM_MASK | GFP_CONSTRAINT_MASK), node);
	if (!page)
		goto out;

	inc_slabs_node(s, page_to_nid(page), page->objects);
	page->slab = s;
	page->flags |= 1 << PG_slab;
	if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON |
			SLAB_STORE_USER | SLAB_TRACE))
		__SetPageSlubDebug(page);

	start = page_address(page);

	if (unlikely(s->flags & SLAB_POISON))
		memset(start, POISON_INUSE, PAGE_SIZE << compound_order(page));

	last = start;
	for_each_object(p, s, start, page->objects) {
		setup_object(s, page, last);
		set_freepointer(s, last, p);
		last = p;
	}
	setup_object(s, page, last);
	set_freepointer(s, last, NULL);

	page->freelist = start;
	page->inuse = 0;
out:
	return page;
}

static void __free_slab(struct kmem_cache *s, struct page *page)
{
	int order = compound_order(page);
	int pages = 1 << order;

	if (unlikely(SLABDEBUG && PageSlubDebug(page))) {
		void *p;

		slab_pad_check(s, page);
		for_each_object(p, s, page_address(page),
						page->objects)
			check_object(s, page, p, 0);
		__ClearPageSlubDebug(page);
	}

	kmemcheck_free_shadow(page, compound_order(page));

	mod_zone_page_state(page_zone(page),
		(s->flags & SLAB_RECLAIM_ACCOUNT) ?
		NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
		-pages);

	__ClearPageSlab(page);
	reset_page_mapcount(page);
	if (current->reclaim_state)
		current->reclaim_state->reclaimed_slab += pages;
	__free_pages(page, order);
}

static void rcu_free_slab(struct rcu_head *h)
{
	struct page *page;

	page = container_of((struct list_head *)h, struct page, lru);
	__free_slab(page->slab, page);
}

static void free_slab(struct kmem_cache *s, struct page *page)
{
	if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) {
		/*
		 * RCU free overloads the RCU head over the LRU
		 */
		struct rcu_head *head = (void *)&page->lru;

		call_rcu(head, rcu_free_slab);
	} else
		__free_slab(s, page);
}

static void discard_slab(struct kmem_cache *s, struct page *page)
{
	dec_slabs_node(s, page_to_nid(page), page->objects);
	free_slab(s, page);
}

/*
 * Per slab locking using the pagelock
 */
static __always_inline void slab_lock(struct page *page)
{
	bit_spin_lock(PG_locked, &page->flags);
}

static __always_inline void slab_unlock(struct page *page)
{
	__bit_spin_unlock(PG_locked, &page->flags);
}

static __always_inline int slab_trylock(struct page *page)
{
	int rc = 1;

	rc = bit_spin_trylock(PG_locked, &page->flags);
	return rc;
}

/*
 * Management of partially allocated slabs
 */
static void add_partial(struct kmem_cache_node *n,
				struct page *page, int tail)
{
	spin_lock(&n->list_lock);
	n->nr_partial++;
	if (tail)
		list_add_tail(&page->lru, &n->partial);
	else
		list_add(&page->lru, &n->partial);
	spin_unlock(&n->list_lock);
}

static void remove_partial(struct kmem_cache *s, struct page *page)
{
	struct kmem_cache_node *n = get_node(s, page_to_nid(page));

	spin_lock(&n->list_lock);
	list_del(&page->lru);
	n->nr_partial--;
	spin_unlock(&n->list_lock);
}

/*
 * Lock slab and remove from the partial list.
 *
 * Must hold list_lock.
 */
static inline int lock_and_freeze_slab(struct kmem_cache_node *n,
							struct page *page)
{
	if (slab_trylock(page)) {
		list_del(&page->lru);
		n->nr_partial--;
		__SetPageSlubFrozen(page);
		return 1;
	}
	return 0;
}

/*
 * Try to allocate a partial slab from a specific node.
 */
static struct page *get_partial_node(struct kmem_cache_node *n)
{
	struct page *page;

	/*
	 * Racy check. If we mistakenly see no partial slabs then we
	 * just allocate an empty slab. If we mistakenly try to get a
	 * partial slab and there is none available then get_partials()
	 * will return NULL.
	 */
	if (!n || !n->nr_partial)
		return NULL;

	spin_lock(&n->list_lock);
	list_for_each_entry(page, &n->partial, lru)
		if (lock_and_freeze_slab(n, page))
			goto out;
	page = NULL;
out:
	spin_unlock(&n->list_lock);
	return page;
}

/*
 * Get a page from somewhere. Search in increasing NUMA distances.
 */
static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
{
#ifdef CONFIG_NUMA
	struct zonelist *zonelist;
	struct zoneref *z;
	struct zone *zone;
	enum zone_type high_zoneidx = gfp_zone(flags);
	struct page *page;

	/*
	 * The defrag ratio allows a configuration of the tradeoffs between
	 * inter node defragmentation and node local allocations. A lower
	 * defrag_ratio increases the tendency to do local allocations
	 * instead of attempting to obtain partial slabs from other nodes.
	 *
	 * If the defrag_ratio is set to 0 then kmalloc() always
	 * returns node local objects. If the ratio is higher then kmalloc()
	 * may return off node objects because partial slabs are obtained
	 * from other nodes and filled up.
	 *
	 * If /sys/kernel/slab/xx/defrag_ratio is set to 100 (which makes
	 * defrag_ratio = 1000) then every (well almost) allocation will
	 * first attempt to defrag slab caches on other nodes. This means
	 * scanning over all nodes to look for partial slabs which may be
	 * expensive if we do it every time we are trying to find a slab
	 * with available objects.
	 */
	if (!s->remote_node_defrag_ratio ||
			get_cycles() % 1024 > s->remote_node_defrag_ratio)
		return NULL;

	zonelist = node_zonelist(slab_node(current->mempolicy), flags);
	for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
		struct kmem_cache_node *n;

		n = get_node(s, zone_to_nid(zone));

		if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
				n->nr_partial > s->min_partial) {
			page = get_partial_node(n);
			if (page)
				return page;
		}
	}
#endif
	return NULL;
}

/*
 * Get a partial page, lock it and return it.
 */
static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node)
{
	struct page *page;
	int searchnode = (node == -1) ? numa_node_id() : node;

	page = get_partial_node(get_node(s, searchnode));
	if (page || (flags & __GFP_THISNODE))
		return page;

	return get_any_partial(s, flags);
}

/*
 * Move a page back to the lists.
 *
 * Must be called with the slab lock held.
 *
 * On exit the slab lock will have been dropped.
 */
static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
{
	struct kmem_cache_node *n = get_node(s, page_to_nid(page));
	struct kmem_cache_cpu *c = get_cpu_slab(s, smp_processor_id());

	__ClearPageSlubFrozen(page);
	if (page->inuse) {

		if (page->freelist) {
			add_partial(n, page, tail);
			stat(c, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD);
		} else {
			stat(c, DEACTIVATE_FULL);
			if (SLABDEBUG && PageSlubDebug(page) &&
						(s->flags & SLAB_STORE_USER))
				add_full(n, page);
		}
		slab_unlock(page);
	} else {
		stat(c, DEACTIVATE_EMPTY);
		if (n->nr_partial < s->min_partial) {
			/*
			 * Adding an empty slab to the partial slabs in order
			 * to avoid page allocator overhead. This slab needs
			 * to come after the other slabs with objects in
			 * so that the others get filled first. That way the
			 * size of the partial list stays small.
			 *
			 * kmem_cache_shrink can reclaim any empty slabs from
			 * the partial list.
			 */
			add_partial(n, page, 1);
			slab_unlock(page);
		} else {
			slab_unlock(page);
			stat(get_cpu_slab(s, raw_smp_processor_id()), FREE_SLAB);
			discard_slab(s, page);
		}
	}
}

/*
 * Remove the cpu slab
 */
static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
{
	struct page *page = c->page;
	int tail = 1;

	if (page->freelist)
		stat(c, DEACTIVATE_REMOTE_FREES);
	/*
	 * Merge cpu freelist into slab freelist. Typically we get here
	 * because both freelists are empty. So this is unlikely
	 * to occur.
	 */
	while (unlikely(c->freelist)) {
		void **object;

		tail = 0;	/* Hot objects. Put the slab first */

		/* Retrieve object from cpu_freelist */
		object = c->freelist;
		c->freelist = c->freelist[c->offset];

		/* And put onto the regular freelist */
		object[c->offset] = page->freelist;
		page->freelist = object;
		page->inuse--;
	}
	c->page = NULL;
	unfreeze_slab(s, page, tail);
}

static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
{
	stat(c, CPUSLAB_FLUSH);
	slab_lock(c->page);
	deactivate_slab(s, c);
}

/*
 * Flush cpu slab.
 *
 * Called from IPI handler with interrupts disabled.
 */
static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu)
{
	struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);

	if (likely(c && c->page))
		flush_slab(s, c);
}

static void flush_cpu_slab(void *d)
{
	struct kmem_cache *s = d;

	__flush_cpu_slab(s, smp_processor_id());
}

static void flush_all(struct kmem_cache *s)
{
	on_each_cpu(flush_cpu_slab, s, 1);
}

/*
 * Check if the objects in a per cpu structure fit numa
 * locality expectations.
 */
static inline int node_match(struct kmem_cache_cpu *c, int node)
{
#ifdef CONFIG_NUMA
	if (node != -1 && c->node != node)
		return 0;
#endif
	return 1;
}

static int count_free(struct page *page)
{
	return page->objects - page->inuse;
}

static unsigned long count_partial(struct kmem_cache_node *n,
					int (*get_count)(struct page *))
{
	unsigned long flags;
	unsigned long x = 0;
	struct page *page;

	spin_lock_irqsave(&n->list_lock, flags);
	list_for_each_entry(page, &n->partial, lru)
		x += get_count(page);
	spin_unlock_irqrestore(&n->list_lock, flags);
	return x;
}

static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
{
#ifdef CONFIG_SLUB_DEBUG
	return atomic_long_read(&n->total_objects);
#else
	return 0;
#endif
}

static noinline void
slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
{
	int node;

	printk(KERN_WARNING
		"SLUB: Unable to allocate memory on node %d (gfp=0x%x)\n",
		nid, gfpflags);
	printk(KERN_WARNING "  cache: %s, object size: %d, buffer size: %d, "
		"default order: %d, min order: %d\n", s->name, s->objsize,
		s->size, oo_order(s->oo), oo_order(s->min));

	if (oo_order(s->min) > get_order(s->objsize))
		printk(KERN_WARNING "  %s debugging increased min order, use "
		       "slub_debug=O to disable.\n", s->name);

	for_each_online_node(node) {
		struct kmem_cache_node *n = get_node(s, node);
		unsigned long nr_slabs;
		unsigned long nr_objs;
		unsigned long nr_free;

		if (!n)
			continue;

		nr_free  = count_partial(n, count_free);
		nr_slabs = node_nr_slabs(n);
		nr_objs  = node_nr_objs(n);

		printk(KERN_WARNING
			"  node %d: slabs: %ld, objs: %ld, free: %ld\n",
			node, nr_slabs, nr_objs, nr_free);
	}
}

/*
 * Slow path. The lockless freelist is empty or we need to perform
 * debugging duties.
 *
 * Interrupts are disabled.
 *
 * Processing is still very fast if new objects have been freed to the
 * regular freelist. In that case we simply take over the regular freelist
 * as the lockless freelist and zap the regular freelist.
 *
 * If that is not working then we fall back to the partial lists. We take the
 * first element of the freelist as the object to allocate now and move the
 * rest of the freelist to the lockless freelist.
 *
 * And if we were unable to get a new slab from the partial slab lists then
 * we need to allocate a new slab. This is the slowest path since it involves
 * a call to the page allocator and the setup of a new slab.
 */
static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
			  unsigned long addr, struct kmem_cache_cpu *c)
{
	void **object;
	struct page *new;

	/* We handle __GFP_ZERO in the caller */
	gfpflags &= ~__GFP_ZERO;

	if (!c->page)
		goto new_slab;

	slab_lock(c->page);
	if (unlikely(!node_match(c, node)))
		goto another_slab;

	stat(c, ALLOC_REFILL);

load_freelist:
	object = c->page->freelist;
	if (unlikely(!object))
		goto another_slab;
	if (unlikely(SLABDEBUG && PageSlubDebug(c->page)))
		goto debug;

	c->freelist = object[c->offset];
	c->page->inuse = c->page->objects;
	c->page->freelist = NULL;
	c->node = page_to_nid(c->page);
unlock_out:
	slab_unlock(c->page);
	stat(c, ALLOC_SLOWPATH);
	return object;

another_slab:
	deactivate_slab(s, c);

new_slab:
	new = get_partial(s, gfpflags, node);
	if (new) {
		c->page = new;
		stat(c, ALLOC_FROM_PARTIAL);
		goto load_freelist;
	}

	if (gfpflags & __GFP_WAIT)
		local_irq_enable();

	new = new_slab(s, gfpflags, node);

	if (gfpflags & __GFP_WAIT)
		local_irq_disable();

	if (new) {
		c = get_cpu_slab(s, smp_processor_id());
		stat(c, ALLOC_SLAB);
		if (c->page)
			flush_slab(s, c);
		slab_lock(new);
		__SetPageSlubFrozen(new);
		c->page = new;
		goto load_freelist;
	}
	if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
		slab_out_of_memory(s, gfpflags, node);
	return NULL;
debug:
	if (!alloc_debug_processing(s, c->page, object, addr))
		goto another_slab;

	c->page->inuse++;
	c->page->freelist = object[c->offset];
	c->node = -1;
	goto unlock_out;
}

/*
 * Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc)
 * have the fastpath folded into their functions. So no function call
 * overhead for requests that can be satisfied on the fastpath.
 *
 * The fastpath works by first checking if the lockless freelist can be used.
 * If not then __slab_alloc is called for slow processing.
 *
 * Otherwise we can simply pick the next object from the lockless free list.
 */
static __always_inline void *slab_alloc(struct kmem_cache *s,
		gfp_t gfpflags, int node, unsigned long addr)
{
	void **object;
	struct kmem_cache_cpu *c;
	unsigned long flags;
	unsigned int objsize;

	gfpflags &= gfp_allowed_mask;

	lockdep_trace_alloc(gfpflags);
	might_sleep_if(gfpflags & __GFP_WAIT);

	if (should_failslab(s->objsize, gfpflags))
		return NULL;

	local_irq_save(flags);
	c = get_cpu_slab(s, smp_processor_id());
	objsize = c->objsize;
	if (unlikely(!c->freelist || !node_match(c, node)))

		object = __slab_alloc(s, gfpflags, node, addr, c);

	else {
		object = c->freelist;
		c->freelist = object[c->offset];
		stat(c, ALLOC_FASTPATH);
	}
	local_irq_restore(flags);

	if (unlikely((gfpflags & __GFP_ZERO) && object))
		memset(object, 0, objsize);

	kmemcheck_slab_alloc(s, gfpflags, object, c->objsize);
	kmemleak_alloc_recursive(object, objsize, 1, s->flags, gfpflags);

	return object;
}

void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
{
	void *ret = slab_alloc(s, gfpflags, -1, _RET_IP_);

	trace_kmem_cache_alloc(_RET_IP_, ret, s->objsize, s->size, gfpflags);

	return ret;
}
EXPORT_SYMBOL(kmem_cache_alloc);

#ifdef CONFIG_KMEMTRACE
void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
{
	return slab_alloc(s, gfpflags, -1, _RET_IP_);
}
EXPORT_SYMBOL(kmem_cache_alloc_notrace);
#endif

#ifdef CONFIG_NUMA
void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
{
	void *ret = slab_alloc(s, gfpflags, node, _RET_IP_);

	trace_kmem_cache_alloc_node(_RET_IP_, ret,
				    s->objsize, s->size, gfpflags, node);

	return ret;
}
EXPORT_SYMBOL(kmem_cache_alloc_node);
#endif

#ifdef CONFIG_KMEMTRACE
void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
				    gfp_t gfpflags,
				    int node)
{
	return slab_alloc(s, gfpflags, node, _RET_IP_);
}
EXPORT_SYMBOL(kmem_cache_alloc_node_notrace);
#endif

/*
 * Slow patch handling. This may still be called frequently since objects
 * have a longer lifetime than the cpu slabs in most processing loads.
 *
 * So we still attempt to reduce cache line usage. Just take the slab
 * lock and free the item. If there is no additional partial page
 * handling required then we can return immediately.
 */
static void __slab_free(struct kmem_cache *s, struct page *page,
			void *x, unsigned long addr, unsigned int offset)
{
	void *prior;
	void **object = (void *)x;
	struct kmem_cache_cpu *c;

	c = get_cpu_slab(s, raw_smp_processor_id());
	stat(c, FREE_SLOWPATH);
	slab_lock(page);

	if (unlikely(SLABDEBUG && PageSlubDebug(page)))
		goto debug;

checks_ok:
	prior = object[offset] = page->freelist;
	page->freelist = object;
	page->inuse--;

	if (unlikely(PageSlubFrozen(page))) {
		stat(c, FREE_FROZEN);
		goto out_unlock;
	}

	if (unlikely(!page->inuse))
		goto slab_empty;

	/*
	 * Objects left in the slab. If it was not on the partial list before
	 * then add it.
	 */
	if (unlikely(!prior)) {
		add_partial(get_node(s, page_to_nid(page)), page, 1);
		stat(c, FREE_ADD_PARTIAL);
	}

out_unlock:
	slab_unlock(page);
	return;

slab_empty:
	if (prior) {
		/*
		 * Slab still on the partial list.
		 */
		remove_partial(s, page);
		stat(c, FREE_REMOVE_PARTIAL);
	}
	slab_unlock(page);
	stat(c, FREE_SLAB);
	discard_slab(s, page);
	return;

debug:
	if (!free_debug_processing(s, page, x, addr))
		goto out_unlock;
	goto checks_ok;
}

/*
 * Fastpath with forced inlining to produce a kfree and kmem_cache_free that
 * can perform fastpath freeing without additional function calls.
 *
 * The fastpath is only possible if we are freeing to the current cpu slab
 * of this processor. This typically the case if we have just allocated
 * the item before.
 *
 * If fastpath is not possible then fall back to __slab_free where we deal
 * with all sorts of special processing.
 */
static __always_inline void slab_free(struct kmem_cache *s,
			struct page *page, void *x, unsigned long addr)
{
	void **object = (void *)x;
	struct kmem_cache_cpu *c;
	unsigned long flags;

	kmemleak_free_recursive(x, s->flags);
	local_irq_save(flags);
	c = get_cpu_slab(s, smp_processor_id());
	kmemcheck_slab_free(s, object, c->objsize);
	debug_check_no_locks_freed(object, c->objsize);
	if (!(s->flags & SLAB_DEBUG_OBJECTS))
		debug_check_no_obj_freed(object, c->objsize);
	if (likely(page == c->page && c->node >= 0)) {
		object[c->offset] = c->freelist;
		c->freelist = object;
		stat(c, FREE_FASTPATH);
	} else
		__slab_free(s, page, x, addr, c->offset);

	local_irq_restore(flags);
}

void kmem_cache_free(struct kmem_cache *s, void *x)
{
	struct page *page;

	page = virt_to_head_page(x);

	slab_free(s, page, x, _RET_IP_);

	trace_kmem_cache_free(_RET_IP_, x);
}
EXPORT_SYMBOL(kmem_cache_free);

/* Figure out on which slab page the object resides */
static struct page *get_object_page(const void *x)
{
	struct page *page = virt_to_head_page(x);

	if (!PageSlab(page))
		return NULL;

	return page;
}

/*
 * Object placement in a slab is made very easy because we always start at
 * offset 0. If we tune the size of the object to the alignment then we can
 * get the required alignment by putting one properly sized object after
 * another.
 *
 * Notice that the allocation order determines the sizes of the per cpu
 * caches. Each processor has always one slab available for allocations.
 * Increasing the allocation order reduces the number of times that slabs
 * must be moved on and off the partial lists and is therefore a factor in
 * locking overhead.
 */

/*
 * Mininum / Maximum order of slab pages. This influences locking overhead
 * and slab fragmentation. A higher order reduces the number of partial slabs
 * and increases the number of allocations possible without having to
 * take the list_lock.
 */
static int slub_min_order;
static int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
static int slub_min_objects;

/*
 * Merge control. If this is set then no merging of slab caches will occur.
 * (Could be removed. This was introduced to pacify the merge skeptics.)
 */
static int slub_nomerge;

/*
 * Calculate the order of allocation given an slab object size.
 *
 * The order of allocation has significant impact on performance and other
 * system components. Generally order 0 allocations should be preferred since
 * order 0 does not cause fragmentation in the page allocator. Larger objects
 * be problematic to put into order 0 slabs because there may be too much
 * unused space left. We go to a higher order if more than 1/16th of the slab
 * would be wasted.
 *
 * In order to reach satisfactory performance we must ensure that a minimum
 * number of objects is in one slab. Otherwise we may generate too much
 * activity on the partial lists which requires taking the list_lock. This is
 * less a concern for large slabs though which are rarely used.
 *
 * slub_max_order specifies the order where we begin to stop considering the
 * number of objects in a slab as critical. If we reach slub_max_order then
 * we try to keep the page order as low as possible. So we accept more waste
 * of space in favor of a small page order.
 *
 * Higher order allocations also allow the placement of more objects in a
 * slab and thereby reduce object handling overhead. If the user has
 * requested a higher mininum order then we start with that one instead of
 * the smallest order which will fit the object.
 */
static inline int slab_order(int size, int min_objects,
				int max_order, int fract_leftover)
{
	int order;
	int rem;
	int min_order = slub_min_order;

	if ((PAGE_SIZE << min_order) / size > MAX_OBJS_PER_PAGE)
		return get_order(size * MAX_OBJS_PER_PAGE) - 1;

	for (order = max(min_order,
				fls(min_objects * size - 1) - PAGE_SHIFT);
			order <= max_order; order++) {

		unsigned long slab_size = PAGE_SIZE << order;

		if (slab_size < min_objects * size)
			continue;

		rem = slab_size % size;

		if (rem <= slab_size / fract_leftover)
			break;

	}

	return order;
}

static inline int calculate_order(int size)
{
	int order;
	int min_objects;
	int fraction;
	int max_objects;

	/*
	 * Attempt to find best configuration for a slab. This
	 * works by first attempting to generate a layout with
	 * the best configuration and backing off gradually.
	 *
	 * First we reduce the acceptable waste in a slab. Then
	 * we reduce the minimum objects required in a slab.
	 */
	min_objects = slub_min_objects;
	if (!min_objects)
		min_objects = 4 * (fls(nr_cpu_ids) + 1);
	max_objects = (PAGE_SIZE << slub_max_order)/size;
	min_objects = min(min_objects, max_objects);

	while (min_objects > 1) {
		fraction = 16;
		while (fraction >= 4) {
			order = slab_order(size, min_objects,
						slub_max_order, fraction);
			if (order <= slub_max_order)
				return order;
			fraction /= 2;
		}
		min_objects--;
	}

	/*
	 * We were unable to place multiple objects in a slab. Now
	 * lets see if we can place a single object there.
	 */
	order = slab_order(size, 1, slub_max_order, 1);
	if (order <= slub_max_order)
		return order;

	/*
	 * Doh this slab cannot be placed using slub_max_order.
	 */
	order = slab_order(size, 1, MAX_ORDER, 1);
	if (order < MAX_ORDER)
		return order;
	return -ENOSYS;
}

/*
 * Figure out what the alignment of the objects will be.
 */
static unsigned long calculate_alignment(unsigned long flags,
		unsigned long align, unsigned long size)
{
	/*
	 * If the user wants hardware cache aligned objects then follow that
	 * suggestion if the object is sufficiently large.
	 *
	 * The hardware cache alignment cannot override the specified
	 * alignment though. If that is greater then use it.
	 */
	if (flags & SLAB_HWCACHE_ALIGN) {
		unsigned long ralign = cache_line_size();
		while (size <= ralign / 2)
			ralign /= 2;
		align = max(align, ralign);
	}

	if (align < ARCH_SLAB_MINALIGN)
		align = ARCH_SLAB_MINALIGN;

	return ALIGN(align, sizeof(void *));
}

static void init_kmem_cache_cpu(struct kmem_cache *s,
			struct kmem_cache_cpu *c)
{
	c->page = NULL;
	c->freelist = NULL;
	c->node = 0;
	c->offset = s->offset / sizeof(void *);
	c->objsize = s->objsize;
#ifdef CONFIG_SLUB_STATS
	memset(c->stat, 0, NR_SLUB_STAT_ITEMS * sizeof(unsigned));
#endif
}

static void
init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s)
{
	n->nr_partial = 0;
	spin_lock_init(&n->list_lock);
	INIT_LIST_HEAD(&n->partial);
#ifdef CONFIG_SLUB_DEBUG
	atomic_long_set(&n->nr_slabs, 0);
	atomic_long_set(&n->total_objects, 0);
	INIT_LIST_HEAD(&n->full);
#endif
}

#ifdef CONFIG_SMP
/*
 * Per cpu array for per cpu structures.
 *
 * The per cpu array places all kmem_cache_cpu structures from one processor
 * close together meaning that it becomes possible that multiple per cpu
 * structures are contained in one cacheline. This may be particularly
 * beneficial for the kmalloc caches.
 *
 * A desktop system typically has around 60-80 slabs. With 100 here we are
 * likely able to get per cpu structures for all caches from the array defined
 * here. We must be able to cover all kmalloc caches during bootstrap.
 *
 * If the per cpu array is exhausted then fall back to kmalloc
 * of individual cachelines. No sharing is possible then.
 */
#define NR_KMEM_CACHE_CPU 100

static DEFINE_PER_CPU(struct kmem_cache_cpu [NR_KMEM_CACHE_CPU],
		      kmem_cache_cpu);

static DEFINE_PER_CPU(struct kmem_cache_cpu *, kmem_cache_cpu_free);
static DECLARE_BITMAP(kmem_cach_cpu_free_init_once, CONFIG_NR_CPUS);

static struct kmem_cache_cpu *alloc_kmem_cache_cpu(struct kmem_cache *s,
							int cpu, gfp_t flags)
{
	struct kmem_cache_cpu *c = per_cpu(kmem_cache_cpu_free, cpu);

	if (c)
		per_cpu(kmem_cache_cpu_free, cpu) =
				(void *)c->freelist;
	else {
		/* Table overflow: So allocate ourselves */
		c = kmalloc_node(
			ALIGN(sizeof(struct kmem_cache_cpu), cache_line_size()),
			flags, cpu_to_node(cpu));
		if (!c)
			return NULL;
	}

	init_kmem_cache_cpu(s, c);
	return c;
}

static void free_kmem_cache_cpu(struct kmem_cache_cpu *c, int cpu)
{
	if (c < per_cpu(kmem_cache_cpu, cpu) ||
			c >= per_cpu(kmem_cache_cpu, cpu) + NR_KMEM_CACHE_CPU) {
		kfree(c);
		return;
	}
	c->freelist = (void *)per_cpu(kmem_cache_cpu_free, cpu);
	per_cpu(kmem_cache_cpu_free, cpu) = c;
}

static void free_kmem_cache_cpus(struct kmem_cache *s)
{
	int cpu;

	for_each_online_cpu(cpu) {
		struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);

		if (c) {
			s->cpu_slab[cpu] = NULL;
			free_kmem_cache_cpu(c, cpu);
		}
	}
}

static int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags)
{
	int cpu;

	for_each_online_cpu(cpu) {
		struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);

		if (c)
			continue;

		c = alloc_kmem_cache_cpu(s, cpu, flags);
		if (!c) {
			free_kmem_cache_cpus(s);
			return 0;
		}
		s->cpu_slab[cpu] = c;
	}
	return 1;
}

/*
 * Initialize the per cpu array.
 */
static void init_alloc_cpu_cpu(int cpu)
{
	int i;

	if (cpumask_test_cpu(cpu, to_cpumask(kmem_cach_cpu_free_init_once)))
		return;

	for (i = NR_KMEM_CACHE_CPU - 1; i >= 0; i--)
		free_kmem_cache_cpu(&per_cpu(kmem_cache_cpu, cpu)[i], cpu);

	cpumask_set_cpu(cpu, to_cpumask(kmem_cach_cpu_free_init_once));
}

static void __init init_alloc_cpu(void)
{
	int cpu;

	for_each_online_cpu(cpu)
		init_alloc_cpu_cpu(cpu);
  }

#else
static inline void free_kmem_cache_cpus(struct kmem_cache *s) {}
static inline void init_alloc_cpu(void) {}

static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags)
{
	init_kmem_cache_cpu(s, &s->cpu_slab);
	return 1;
}
#endif

#ifdef CONFIG_NUMA
/*
 * No kmalloc_node yet so do it by hand. We know that this is the first
 * slab on the node for this slabcache. There are no concurrent accesses
 * possible.
 *
 * Note that this function only works on the kmalloc_node_cache
 * when allocating for the kmalloc_node_cache. This is used for bootstrapping
 * memory on a fresh node that has no slab structures yet.
 */
static void early_kmem_cache_node_alloc(gfp_t gfpflags, int node)
{
	struct page *page;
	struct kmem_cache_node *n;
	unsigned long flags;

	BUG_ON(kmalloc_caches->size < sizeof(struct kmem_cache_node));

	page = new_slab(kmalloc_caches, gfpflags, node);

	BUG_ON(!page);
	if (page_to_nid(page) != node) {
		printk(KERN_ERR "SLUB: Unable to allocate memory from "
				"node %d\n", node);
		printk(KERN_ERR "SLUB: Allocating a useless per node structure "
				"in order to be able to continue\n");
	}

	n = page->freelist;
	BUG_ON(!n);
	page->freelist = get_freepointer(kmalloc_caches, n);
	page->inuse++;
	kmalloc_caches->node[node] = n;
#ifdef CONFIG_SLUB_DEBUG
	init_object(kmalloc_caches, n, 1);
	init_tracking(kmalloc_caches, n);
#endif
	init_kmem_cache_node(n, kmalloc_caches);
	inc_slabs_node(kmalloc_caches, node, page->objects);

	/*
	 * lockdep requires consistent irq usage for each lock
	 * so even though there cannot be a race this early in
	 * the boot sequence, we still disable irqs.
	 */
	local_irq_save(flags);
	add_partial(n, page, 0);
	local_irq_restore(flags);
}

static void free_kmem_cache_nodes(struct kmem_cache *s)
{
	int node;

	for_each_node_state(node, N_NORMAL_MEMORY) {
		struct kmem_cache_node *n = s->node[node];
		if (n && n != &s->local_node)
			kmem_cache_free(kmalloc_caches, n);
		s->node[node] = NULL;
	}
}

static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags)
{
	int node;
	int local_node;

	if (slab_state >= UP)
		local_node = page_to_nid(virt_to_page(s));
	else
		local_node = 0;

	for_each_node_state(node, N_NORMAL_MEMORY) {
		struct kmem_cache_node *n;

		if (local_node == node)
			n = &s->local_node;
		else {
			if (slab_state == DOWN) {
				early_kmem_cache_node_alloc(gfpflags, node);
				continue;
			}
			n = kmem_cache_alloc_node(kmalloc_caches,
							gfpflags, node);

			if (!n) {
				free_kmem_cache_nodes(s);
				return 0;
			}

		}
		s->node[node] = n;
		init_kmem_cache_node(n, s);
	}
	return 1;
}
#else
static void free_kmem_cache_nodes(struct kmem_cache *s)
{
}

static int init_kmem_cache_nodes(struct kmem_cache *s, gfp_t gfpflags)
{
	init_kmem_cache_node(&s->local_node, s);
	return 1;
}
#endif

static void set_min_partial(struct kmem_cache *s, unsigned long min)
{
	if (min < MIN_PARTIAL)
		min = MIN_PARTIAL;
	else if (min > MAX_PARTIAL)
		min = MAX_PARTIAL;
	s->min_partial = min;
}

/*
 * calculate_sizes() determines the order and the distribution of data within
 * a slab object.
 */
static int calculate_sizes(struct kmem_cache *s, int forced_order)
{
	unsigned long flags = s->flags;
	unsigned long size = s->objsize;
	unsigned long align = s->align;
	int order;

	/*
	 * Round up object size to the next word boundary. We can only
	 * place the free pointer at word boundaries and this determines
	 * the possible location of the free pointer.
	 */
	size = ALIGN(size, sizeof(void *));

#ifdef CONFIG_SLUB_DEBUG
	/*
	 * Determine if we can poison the object itself. If the user of
	 * the slab may touch the object after free or before allocation
	 * then we should never poison the object itself.
	 */
	if ((flags & SLAB_POISON) && !(flags & SLAB_DESTROY_BY_RCU) &&
			!s->ctor)
		s->flags |= __OBJECT_POISON;
	else
		s->flags &= ~__OBJECT_POISON;


	/*
	 * If we are Redzoning then check if there is some space between the
	 * end of the object and the free pointer. If not then add an
	 * additional word to have some bytes to store Redzone information.
	 */
	if ((flags & SLAB_RED_ZONE) && size == s->objsize)
		size += sizeof(void *);
#endif

	/*
	 * With that we have determined the number of bytes in actual use
	 * by the object. This is the potential offset to the free pointer.
	 */
	s->inuse = size;

	if (((flags & (SLAB_DESTROY_BY_RCU | SLAB_POISON)) ||
		s->ctor)) {
		/*
		 * Relocate free pointer after the object if it is not
		 * permitted to overwrite the first word of the object on
		 * kmem_cache_free.
		 *
		 * This is the case if we do RCU, have a constructor or
		 * destructor or are poisoning the objects.
		 */
		s->offset = size;
		size += sizeof(void *);
	}

#ifdef CONFIG_SLUB_DEBUG
	if (flags & SLAB_STORE_USER)
		/*
		 * Need to store information about allocs and frees after
		 * the object.
		 */
		size += 2 * sizeof(struct track);

	if (flags & SLAB_RED_ZONE)
		/*
		 * Add some empty padding so that we can catch
		 * overwrites from earlier objects rather than let
		 * tracking information or the free pointer be
		 * corrupted if a user writes before the start
		 * of the object.
		 */
		size += sizeof(void *);
#endif

	/*
	 * Determine the alignment based on various parameters that the
	 * user specified and the dynamic determination of cache line size
	 * on bootup.
	 */
	align = calculate_alignment(flags, align, s->objsize);
	s->align = align;

	/*
	 * SLUB stores one object immediately after another beginning from
	 * offset 0. In order to align the objects we have to simply size
	 * each object to conform to the alignment.
	 */
	size = ALIGN(size, align);
	s->size = size;
	if (forced_order >= 0)
		order = forced_order;
	else
		order = calculate_order(size);

	if (order < 0)
		return 0;

	s->allocflags = 0;
	if (order)
		s->allocflags |= __GFP_COMP;

	if (s->flags & SLAB_CACHE_DMA)
		s->allocflags |= SLUB_DMA;

	if (s->flags & SLAB_RECLAIM_ACCOUNT)
		s->allocflags |= __GFP_RECLAIMABLE;

	/*
	 * Determine the number of objects per slab
	 */
	s->oo = oo_make(order, size);
	s->min = oo_make(get_order(size), size);
	if (oo_objects(s->oo) > oo_objects(s->max))
		s->max = s->oo;

	return !!oo_objects(s->oo);

}

static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags,
		const char *name, size_t size,
		size_t align, unsigned long flags,
		void (*ctor)(void *))
{
	memset(s, 0, kmem_size);
	s->name = name;
	s->ctor = ctor;
	s->objsize = size;
	s->align = align;
	s->flags = kmem_cache_flags(size, flags, name, ctor);

	if (!calculate_sizes(s, -1))
		goto error;
	if (disable_higher_order_debug) {
		/*
		 * Disable debugging flags that store metadata if the min slab
		 * order increased.
		 */
		if (get_order(s->size) > get_order(s->objsize)) {
			s->flags &= ~DEBUG_METADATA_FLAGS;
			s->offset = 0;
			if (!calculate_sizes(s, -1))
				goto error;
		}
	}

	/*
	 * The larger the object size is, the more pages we want on the partial
	 * list to avoid pounding the page allocator excessively.
	 */
	set_min_partial(s, ilog2(s->size));
	s->refcount = 1;
#ifdef CONFIG_NUMA
	s->remote_node_defrag_ratio = 1000;
#endif
	if (!init_kmem_cache_nodes(s, gfpflags & ~SLUB_DMA))
		goto error;

	if (alloc_kmem_cache_cpus(s, gfpflags & ~SLUB_DMA))
		return 1;
	free_kmem_cache_nodes(s);
error:
	if (flags & SLAB_PANIC)
		panic("Cannot create slab %s size=%lu realsize=%u "
			"order=%u offset=%u flags=%lx\n",
			s->name, (unsigned long)size, s->size, oo_order(s->oo),
			s->offset, flags);
	return 0;
}

/*
 * Check if a given pointer is valid
 */
int kmem_ptr_validate(struct kmem_cache *s, const void *object)
{
	struct page *page;

	page = get_object_page(object);

	if (!page || s != page->slab)
		/* No slab or wrong slab */
		return 0;

	if (!check_valid_pointer(s, page, object))
		return 0;

	/*
	 * We could also check if the object is on the slabs freelist.
	 * But this would be too expensive and it seems that the main
	 * purpose of kmem_ptr_valid() is to check if the object belongs
	 * to a certain slab.
	 */
	return 1;
}
EXPORT_SYMBOL(kmem_ptr_validate);

/*
 * Determine the size of a slab object
 */
unsigned int kmem_cache_size(struct kmem_cache *s)
{
	return s->objsize;
}
EXPORT_SYMBOL(kmem_cache_size);

const char *kmem_cache_name(struct kmem_cache *s)
{
	return s->name;
}
EXPORT_SYMBOL(kmem_cache_name);

static void list_slab_objects(struct kmem_cache *s, struct page *page,
							const char *text)
{
#ifdef CONFIG_SLUB_DEBUG
	void *addr = page_address(page);
	void *p;
	DECLARE_BITMAP(map, page->objects);

	bitmap_zero(map, page->objects);
	slab_err(s, page, "%s", text);
	slab_lock(page);
	for_each_free_object(p, s, page->freelist)
		set_bit(slab_index(p, s, addr), map);

	for_each_object(p, s, addr, page->objects) {

		if (!test_bit(slab_index(p, s, addr), map)) {
			printk(KERN_ERR "INFO: Object 0x%p @offset=%tu\n",
							p, p - addr);
			print_tracking(s, p);
		}
	}
	slab_unlock(page);
#endif
}

/*
 * Attempt to free all partial slabs on a node.
 */
static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
{
	unsigned long flags;
	struct page *page, *h;

	spin_lock_irqsave(&n->list_lock, flags);
	list_for_each_entry_safe(page, h, &n->partial, lru) {
		if (!page->inuse) {
			list_del(&page->lru);
			discard_slab(s, page);
			n->nr_partial--;
		} else {
			list_slab_objects(s, page,
				"Objects remaining on kmem_cache_close()");
		}
	}
	spin_unlock_irqrestore(&n->list_lock, flags);
}

/*
 * Release all resources used by a slab cache.
 */
static inline int kmem_cache_close(struct kmem_cache *s)
{
	int node;

	flush_all(s);

	/* Attempt to free all objects */
	free_kmem_cache_cpus(s);
	for_each_node_state(node, N_NORMAL_MEMORY) {
		struct kmem_cache_node *n = get_node(s, node);

		free_partial(s, n);
		if (n->nr_partial || slabs_node(s, node))
			return 1;
	}
	free_kmem_cache_nodes(s);
	return 0;
}

/*
 * Close a cache and release the kmem_cache structure
 * (must be used for caches created using kmem_cache_create)
 */
void kmem_cache_destroy(struct kmem_cache *s)
{
	down_write(&slub_lock);
	s->refcount--;
	if (!s->refcount) {
		list_del(&s->list);
		up_write(&slub_lock);
		if (kmem_cache_close(s)) {
			printk(KERN_ERR "SLUB %s: %s called for cache that "
				"still has objects.\n", s->name, __func__);
			dump_stack();
		}
		if (s->flags & SLAB_DESTROY_BY_RCU)
			rcu_barrier();
		sysfs_slab_remove(s);
	} else
		up_write(&slub_lock);
}
EXPORT_SYMBOL(kmem_cache_destroy);

/********************************************************************
 *		Kmalloc subsystem
 *******************************************************************/

struct kmem_cache kmalloc_caches[SLUB_PAGE_SHIFT] __cacheline_aligned;
EXPORT_SYMBOL(kmalloc_caches);

static int __init setup_slub_min_order(char *str)
{
	get_option(&str, &slub_min_order);

	return 1;
}

__setup("slub_min_order=", setup_slub_min_order);

static int __init setup_slub_max_order(char *str)
{
	get_option(&str, &slub_max_order);
	slub_max_order = min(slub_max_order, MAX_ORDER - 1);

	return 1;
}

__setup("slub_max_order=", setup_slub_max_order);

static int __init setup_slub_min_objects(char *str)
{
	get_option(&str, &slub_min_objects);

	return 1;
}

__setup("slub_min_objects=", setup_slub_min_objects);

static int __init setup_slub_nomerge(char *str)
{
	slub_nomerge = 1;
	return 1;
}

__setup("slub_nomerge", setup_slub_nomerge);

static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s,
		const char *name, int size, gfp_t gfp_flags)
{
	unsigned int flags = 0;

	if (gfp_flags & SLUB_DMA)
		flags = SLAB_CACHE_DMA;

	/*
	 * This function is called with IRQs disabled during early-boot on
	 * single CPU so there's no need to take slub_lock here.
	 */
	if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN,
								flags, NULL))
		goto panic;

	list_add(&s->list, &slab_caches);

	if (sysfs_slab_add(s))
		goto panic;
	return s;

panic:
	panic("Creation of kmalloc slab %s size=%d failed.\n", name, size);
}

#ifdef CONFIG_ZONE_DMA
static struct kmem_cache *kmalloc_caches_dma[SLUB_PAGE_SHIFT];

static void sysfs_add_func(struct work_struct *w)
{
	struct kmem_cache *s;

	down_write(&slub_lock);
	list_for_each_entry(s, &slab_caches, list) {
		if (s->flags & __SYSFS_ADD_DEFERRED) {
			s->flags &= ~__SYSFS_ADD_DEFERRED;
			sysfs_slab_add(s);
		}
	}
	up_write(&slub_lock);
}

static DECLARE_WORK(sysfs_add_work, sysfs_add_func);

static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags)
{
	struct kmem_cache *s;
	char *text;
	size_t realsize;
	unsigned long slabflags;

	s = kmalloc_caches_dma[index];
	if (s)
		return s;

	/* Dynamically create dma cache */
	if (flags & __GFP_WAIT)
		down_write(&slub_lock);
	else {
		if (!down_write_trylock(&slub_lock))
			goto out;
	}

	if (kmalloc_caches_dma[index])
		goto unlock_out;

	realsize = kmalloc_caches[index].objsize;
	text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d",
			 (unsigned int)realsize);
	s = kmalloc(kmem_size, flags & ~SLUB_DMA);

	/*
	 * Must defer sysfs creation to a workqueue because we don't know
	 * what context we are called from. Before sysfs comes up, we don't
	 * need to do anything because our sysfs initcall will start by
	 * adding all existing slabs to sysfs.
	 */
	slabflags = SLAB_CACHE_DMA|SLAB_NOTRACK;
	if (slab_state >= SYSFS)
		slabflags |= __SYSFS_ADD_DEFERRED;

	if (!s || !text || !kmem_cache_open(s, flags, text,
			realsize, ARCH_KMALLOC_MINALIGN, slabflags, NULL)) {
		kfree(s);
		kfree(text);
		goto unlock_out;
	}

	list_add(&s->list, &slab_caches);
	kmalloc_caches_dma[index] = s;

	if (slab_state >= SYSFS)
		schedule_work(&sysfs_add_work);

unlock_out:
	up_write(&slub_lock);
out:
	return kmalloc_caches_dma[index];
}
#endif

/*
 * Conversion table for small slabs sizes / 8 to the index in the
 * kmalloc array. This is necessary for slabs < 192 since we have non power
 * of two cache sizes there. The size of larger slabs can be determined using
 * fls.
 */
static s8 size_index[24] = {
	3,	/* 8 */
	4,	/* 16 */
	5,	/* 24 */
	5,	/* 32 */
	6,	/* 40 */
	6,	/* 48 */
	6,	/* 56 */
	6,	/* 64 */
	1,	/* 72 */
	1,	/* 80 */
	1,	/* 88 */
	1,	/* 96 */
	7,	/* 104 */
	7,	/* 112 */
	7,	/* 120 */
	7,	/* 128 */
	2,	/* 136 */
	2,	/* 144 */
	2,	/* 152 */
	2,	/* 160 */
	2,	/* 168 */
	2,	/* 176 */
	2,	/* 184 */
	2	/* 192 */
};

static inline int size_index_elem(size_t bytes)
{
	return (bytes - 1) / 8;
}

static struct kmem_cache *get_slab(size_t size, gfp_t flags)
{
	int index;

	if (size <= 192) {
		if (!size)
			return ZERO_SIZE_PTR;

		index = size_index[size_index_elem(size)];
	} else
		index = fls(size - 1);

#ifdef CONFIG_ZONE_DMA
	if (unlikely((flags & SLUB_DMA)))
		return dma_kmalloc_cache(index, flags);

#endif
	return &kmalloc_caches[index];
}

void *__kmalloc(size_t size, gfp_t flags)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > SLUB_MAX_SIZE))
		return kmalloc_large(size, flags);

	s = get_slab(size, flags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc(s, flags, -1, _RET_IP_);

	trace_kmalloc(_RET_IP_, ret, size, s->size, flags);

	return ret;
}
EXPORT_SYMBOL(__kmalloc);

static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
{
	struct page *page;
	void *ptr = NULL;

	flags |= __GFP_COMP | __GFP_NOTRACK;
	page = alloc_pages_node(node, flags, get_order(size));
	if (page)
		ptr = page_address(page);

	kmemleak_alloc(ptr, size, 1, flags);
	return ptr;
}

#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > SLUB_MAX_SIZE)) {
		ret = kmalloc_large_node(size, flags, node);

		trace_kmalloc_node(_RET_IP_, ret,
				   size, PAGE_SIZE << get_order(size),
				   flags, node);

		return ret;
	}

	s = get_slab(size, flags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc(s, flags, node, _RET_IP_);

	trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node);

	return ret;
}
EXPORT_SYMBOL(__kmalloc_node);
#endif

size_t ksize(const void *object)
{
	struct page *page;
	struct kmem_cache *s;

	if (unlikely(object == ZERO_SIZE_PTR))
		return 0;

	page = virt_to_head_page(object);

	if (unlikely(!PageSlab(page))) {
		WARN_ON(!PageCompound(page));
		return PAGE_SIZE << compound_order(page);
	}
	s = page->slab;

#ifdef CONFIG_SLUB_DEBUG
	/*
	 * Debugging requires use of the padding between object
	 * and whatever may come after it.
	 */
	if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
		return s->objsize;

#endif
	/*
	 * If we have the need to store the freelist pointer
	 * back there or track user information then we can
	 * only use the space before that information.
	 */
	if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
		return s->inuse;
	/*
	 * Else we can use all the padding etc for the allocation
	 */
	return s->size;
}
EXPORT_SYMBOL(ksize);

void kfree(const void *x)
{
	struct page *page;
	void *object = (void *)x;

	trace_kfree(_RET_IP_, x);

	if (unlikely(ZERO_OR_NULL_PTR(x)))
		return;

	page = virt_to_head_page(x);
	if (unlikely(!PageSlab(page))) {
		BUG_ON(!PageCompound(page));
		kmemleak_free(x);
		put_page(page);
		return;
	}
	slab_free(page->slab, page, object, _RET_IP_);
}
EXPORT_SYMBOL(kfree);

/*
 * kmem_cache_shrink removes empty slabs from the partial lists and sorts
 * the remaining slabs by the number of items in use. The slabs with the
 * most items in use come first. New allocations will then fill those up
 * and thus they can be removed from the partial lists.
 *
 * The slabs with the least items are placed last. This results in them
 * being allocated from last increasing the chance that the last objects
 * are freed in them.
 */
int kmem_cache_shrink(struct kmem_cache *s)
{
	int node;
	int i;
	struct kmem_cache_node *n;
	struct page *page;
	struct page *t;
	int objects = oo_objects(s->max);
	struct list_head *slabs_by_inuse =
		kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL);
	unsigned long flags;

	if (!slabs_by_inuse)
		return -ENOMEM;

	flush_all(s);
	for_each_node_state(node, N_NORMAL_MEMORY) {
		n = get_node(s, node);

		if (!n->nr_partial)
			continue;

		for (i = 0; i < objects; i++)
			INIT_LIST_HEAD(slabs_by_inuse + i);

		spin_lock_irqsave(&n->list_lock, flags);

		/*
		 * Build lists indexed by the items in use in each slab.
		 *
		 * Note that concurrent frees may occur while we hold the
		 * list_lock. page->inuse here is the upper limit.
		 */
		list_for_each_entry_safe(page, t, &n->partial, lru) {
			if (!page->inuse && slab_trylock(page)) {
				/*
				 * Must hold slab lock here because slab_free
				 * may have freed the last object and be
				 * waiting to release the slab.
				 */
				list_del(&page->lru);
				n->nr_partial--;
				slab_unlock(page);
				discard_slab(s, page);
			} else {
				list_move(&page->lru,
				slabs_by_inuse + page->inuse);
			}
		}

		/*
		 * Rebuild the partial list with the slabs filled up most
		 * first and the least used slabs at the end.
		 */
		for (i = objects - 1; i >= 0; i--)
			list_splice(slabs_by_inuse + i, n->partial.prev);

		spin_unlock_irqrestore(&n->list_lock, flags);
	}

	kfree(slabs_by_inuse);
	return 0;
}
EXPORT_SYMBOL(kmem_cache_shrink);

#if defined(CONFIG_NUMA) && defined(CONFIG_MEMORY_HOTPLUG)
static int slab_mem_going_offline_callback(void *arg)
{
	struct kmem_cache *s;

	down_read(&slub_lock);
	list_for_each_entry(s, &slab_caches, list)
		kmem_cache_shrink(s);
	up_read(&slub_lock);

	return 0;
}

static void slab_mem_offline_callback(void *arg)
{
	struct kmem_cache_node *n;
	struct kmem_cache *s;
	struct memory_notify *marg = arg;
	int offline_node;

	offline_node = marg->status_change_nid;

	/*
	 * If the node still has available memory. we need kmem_cache_node
	 * for it yet.
	 */
	if (offline_node < 0)
		return;

	down_read(&slub_lock);
	list_for_each_entry(s, &slab_caches, list) {
		n = get_node(s, offline_node);
		if (n) {
			/*
			 * if n->nr_slabs > 0, slabs still exist on the node
			 * that is going down. We were unable to free them,
			 * and offline_pages() function shoudn't call this
			 * callback. So, we must fail.
			 */
			BUG_ON(slabs_node(s, offline_node));

			s->node[offline_node] = NULL;
			kmem_cache_free(kmalloc_caches, n);
		}
	}
	up_read(&slub_lock);
}

static int slab_mem_going_online_callback(void *arg)
{
	struct kmem_cache_node *n;
	struct kmem_cache *s;
	struct memory_notify *marg = arg;
	int nid = marg->status_change_nid;
	int ret = 0;

	/*
	 * If the node's memory is already available, then kmem_cache_node is
	 * already created. Nothing to do.
	 */
	if (nid < 0)
		return 0;

	/*
	 * We are bringing a node online. No memory is available yet. We must
	 * allocate a kmem_cache_node structure in order to bring the node
	 * online.
	 */
	down_read(&slub_lock);
	list_for_each_entry(s, &slab_caches, list) {
		/*
		 * XXX: kmem_cache_alloc_node will fallback to other nodes
		 *      since memory is not yet available from the node that
		 *      is brought up.
		 */
		n = kmem_cache_alloc(kmalloc_caches, GFP_KERNEL);
		if (!n) {
			ret = -ENOMEM;
			goto out;
		}
		init_kmem_cache_node(n, s);
		s->node[nid] = n;
	}
out:
	up_read(&slub_lock);
	return ret;
}

static int slab_memory_callback(struct notifier_block *self,
				unsigned long action, void *arg)
{
	int ret = 0;

	switch (action) {
	case MEM_GOING_ONLINE:
		ret = slab_mem_going_online_callback(arg);
		break;
	case MEM_GOING_OFFLINE:
		ret = slab_mem_going_offline_callback(arg);
		break;
	case MEM_OFFLINE:
	case MEM_CANCEL_ONLINE:
		slab_mem_offline_callback(arg);
		break;
	case MEM_ONLINE:
	case MEM_CANCEL_OFFLINE:
		break;
	}
	if (ret)
		ret = notifier_from_errno(ret);
	else
		ret = NOTIFY_OK;
	return ret;
}

#endif /* CONFIG_MEMORY_HOTPLUG */

/********************************************************************
 *			Basic setup of slabs
 *******************************************************************/

void __init kmem_cache_init(void)
{
	int i;
	int caches = 0;

	init_alloc_cpu();

#ifdef CONFIG_NUMA
	/*
	 * Must first have the slab cache available for the allocations of the
	 * struct kmem_cache_node's. There is special bootstrap code in
	 * kmem_cache_open for slab_state == DOWN.
	 */
	create_kmalloc_cache(&kmalloc_caches[0], "kmem_cache_node",
		sizeof(struct kmem_cache_node), GFP_NOWAIT);
	kmalloc_caches[0].refcount = -1;
	caches++;

	hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
#endif

	/* Able to allocate the per node structures */
	slab_state = PARTIAL;

	/* Caches that are not of the two-to-the-power-of size */
	if (KMALLOC_MIN_SIZE <= 32) {
		create_kmalloc_cache(&kmalloc_caches[1],
				"kmalloc-96", 96, GFP_NOWAIT);
		caches++;
	}
	if (KMALLOC_MIN_SIZE <= 64) {
		create_kmalloc_cache(&kmalloc_caches[2],
				"kmalloc-192", 192, GFP_NOWAIT);
		caches++;
	}

	for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) {
		create_kmalloc_cache(&kmalloc_caches[i],
			"kmalloc", 1 << i, GFP_NOWAIT);
		caches++;
	}


	/*
	 * Patch up the size_index table if we have strange large alignment
	 * requirements for the kmalloc array. This is only the case for
	 * MIPS it seems. The standard arches will not generate any code here.
	 *
	 * Largest permitted alignment is 256 bytes due to the way we
	 * handle the index determination for the smaller caches.
	 *
	 * Make sure that nothing crazy happens if someone starts tinkering
	 * around with ARCH_KMALLOC_MINALIGN
	 */
	BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 ||
		(KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1)));

	for (i = 8; i < KMALLOC_MIN_SIZE; i += 8) {
		int elem = size_index_elem(i);
		if (elem >= ARRAY_SIZE(size_index))
			break;
		size_index[elem] = KMALLOC_SHIFT_LOW;
	}

	if (KMALLOC_MIN_SIZE == 64) {
		/*
		 * The 96 byte size cache is not used if the alignment
		 * is 64 byte.
		 */
		for (i = 64 + 8; i <= 96; i += 8)
			size_index[size_index_elem(i)] = 7;
	} else if (KMALLOC_MIN_SIZE == 128) {
		/*
		 * The 192 byte sized cache is not used if the alignment
		 * is 128 byte. Redirect kmalloc to use the 256 byte cache
		 * instead.
		 */
		for (i = 128 + 8; i <= 192; i += 8)
			size_index[size_index_elem(i)] = 8;
	}

	slab_state = UP;

	/* Provide the correct kmalloc names now that the caches are up */
	for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++)
		kmalloc_caches[i]. name =
			kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i);

#ifdef CONFIG_SMP
	register_cpu_notifier(&slab_notifier);
	kmem_size = offsetof(struct kmem_cache, cpu_slab) +
				nr_cpu_ids * sizeof(struct kmem_cache_cpu *);
#else
	kmem_size = sizeof(struct kmem_cache);
#endif

	printk(KERN_INFO
		"SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
		" CPUs=%d, Nodes=%d\n",
		caches, cache_line_size(),
		slub_min_order, slub_max_order, slub_min_objects,
		nr_cpu_ids, nr_node_ids);
}

void __init kmem_cache_init_late(void)
{
}

/*
 * Find a mergeable slab cache
 */
static int slab_unmergeable(struct kmem_cache *s)
{
	if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE))
		return 1;

	if (s->ctor)
		return 1;

	/*
	 * We may have set a slab to be unmergeable during bootstrap.
	 */
	if (s->refcount < 0)
		return 1;

	return 0;
}

static struct kmem_cache *find_mergeable(size_t size,
		size_t align, unsigned long flags, const char *name,
		void (*ctor)(void *))
{
	struct kmem_cache *s;

	if (slub_nomerge || (flags & SLUB_NEVER_MERGE))
		return NULL;

	if (ctor)
		return NULL;

	size = ALIGN(size, sizeof(void *));
	align = calculate_alignment(flags, align, size);
	size = ALIGN(size, align);
	flags = kmem_cache_flags(size, flags, name, NULL);

	list_for_each_entry(s, &slab_caches, list) {
		if (slab_unmergeable(s))
			continue;

		if (size > s->size)
			continue;

		if ((flags & SLUB_MERGE_SAME) != (s->flags & SLUB_MERGE_SAME))
				continue;
		/*
		 * Check if alignment is compatible.
		 * Courtesy of Adrian Drzewiecki
		 */
		if ((s->size & ~(align - 1)) != s->size)
			continue;

		if (s->size - size >= sizeof(void *))
			continue;

		return s;
	}
	return NULL;
}

struct kmem_cache *kmem_cache_create(const char *name, size_t size,
		size_t align, unsigned long flags, void (*ctor)(void *))
{
	struct kmem_cache *s;

	if (WARN_ON(!name))
		return NULL;

	down_write(&slub_lock);
	s = find_mergeable(size, align, flags, name, ctor);
	if (s) {
		int cpu;

		s->refcount++;
		/*
		 * Adjust the object sizes so that we clear
		 * the complete object on kzalloc.
		 */
		s->objsize = max(s->objsize, (int)size);

		/*
		 * And then we need to update the object size in the
		 * per cpu structures
		 */
		for_each_online_cpu(cpu)
			get_cpu_slab(s, cpu)->objsize = s->objsize;

		s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
		up_write(&slub_lock);

		if (sysfs_slab_alias(s, name)) {
			down_write(&slub_lock);
			s->refcount--;
			up_write(&slub_lock);
			goto err;
		}
		return s;
	}

	s = kmalloc(kmem_size, GFP_KERNEL);
	if (s) {
		if (kmem_cache_open(s, GFP_KERNEL, name,
				size, align, flags, ctor)) {
			list_add(&s->list, &slab_caches);
			up_write(&slub_lock);
			if (sysfs_slab_add(s)) {
				down_write(&slub_lock);
				list_del(&s->list);
				up_write(&slub_lock);
				kfree(s);
				goto err;
			}
			return s;
		}
		kfree(s);
	}
	up_write(&slub_lock);

err:
	if (flags & SLAB_PANIC)
		panic("Cannot create slabcache %s\n", name);
	else
		s = NULL;
	return s;
}
EXPORT_SYMBOL(kmem_cache_create);

#ifdef CONFIG_SMP
/*
 * Use the cpu notifier to insure that the cpu slabs are flushed when
 * necessary.
 */
static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb,
		unsigned long action, void *hcpu)
{
	long cpu = (long)hcpu;
	struct kmem_cache *s;
	unsigned long flags;

	switch (action) {
	case CPU_UP_PREPARE:
	case CPU_UP_PREPARE_FROZEN:
		init_alloc_cpu_cpu(cpu);
		down_read(&slub_lock);
		list_for_each_entry(s, &slab_caches, list)
			s->cpu_slab[cpu] = alloc_kmem_cache_cpu(s, cpu,
							GFP_KERNEL);
		up_read(&slub_lock);
		break;

	case CPU_UP_CANCELED:
	case CPU_UP_CANCELED_FROZEN:
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		down_read(&slub_lock);
		list_for_each_entry(s, &slab_caches, list) {
			struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);

			local_irq_save(flags);
			__flush_cpu_slab(s, cpu);
			local_irq_restore(flags);
			free_kmem_cache_cpu(c, cpu);
			s->cpu_slab[cpu] = NULL;
		}
		up_read(&slub_lock);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block __cpuinitdata slab_notifier = {
	.notifier_call = slab_cpuup_callback
};

#endif

void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > SLUB_MAX_SIZE))
		return kmalloc_large(size, gfpflags);

	s = get_slab(size, gfpflags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc(s, gfpflags, -1, caller);

	/* Honor the call site pointer we recieved. */
	trace_kmalloc(caller, ret, size, s->size, gfpflags);

	return ret;
}

void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
					int node, unsigned long caller)
{
	struct kmem_cache *s;
	void *ret;

	if (unlikely(size > SLUB_MAX_SIZE))
		return kmalloc_large_node(size, gfpflags, node);

	s = get_slab(size, gfpflags);

	if (unlikely(ZERO_OR_NULL_PTR(s)))
		return s;

	ret = slab_alloc(s, gfpflags, node, caller);

	/* Honor the call site pointer we recieved. */
	trace_kmalloc_node(caller, ret, size, s->size, gfpflags, node);

	return ret;
}

#ifdef CONFIG_SLUB_DEBUG
static int count_inuse(struct page *page)
{
	return page->inuse;
}

static int count_total(struct page *page)
{
	return page->objects;
}

static int validate_slab(struct kmem_cache *s, struct page *page,
						unsigned long *map)
{
	void *p;
	void *addr = page_address(page);

	if (!check_slab(s, page) ||
			!on_freelist(s, page, NULL))
		return 0;

	/* Now we know that a valid freelist exists */
	bitmap_zero(map, page->objects);

	for_each_free_object(p, s, page->freelist) {
		set_bit(slab_index(p, s, addr), map);
		if (!check_object(s, page, p, 0))
			return 0;
	}

	for_each_object(p, s, addr, page->objects)
		if (!test_bit(slab_index(p, s, addr), map))
			if (!check_object(s, page, p, 1))
				return 0;
	return 1;
}

static void validate_slab_slab(struct kmem_cache *s, struct page *page,
						unsigned long *map)
{
	if (slab_trylock(page)) {
		validate_slab(s, page, map);
		slab_unlock(page);
	} else
		printk(KERN_INFO "SLUB %s: Skipped busy slab 0x%p\n",
			s->name, page);

	if (s->flags & DEBUG_DEFAULT_FLAGS) {
		if (!PageSlubDebug(page))
			printk(KERN_ERR "SLUB %s: SlubDebug not set "
				"on slab 0x%p\n", s->name, page);
	} else {
		if (PageSlubDebug(page))
			printk(KERN_ERR "SLUB %s: SlubDebug set on "
				"slab 0x%p\n", s->name, page);
	}
}

static int validate_slab_node(struct kmem_cache *s,
		struct kmem_cache_node *n, unsigned long *map)
{
	unsigned long count = 0;
	struct page *page;
	unsigned long flags;

	spin_lock_irqsave(&n->list_lock, flags);

	list_for_each_entry(page, &n->partial, lru) {
		validate_slab_slab(s, page, map);
		count++;
	}
	if (count != n->nr_partial)
		printk(KERN_ERR "SLUB %s: %ld partial slabs counted but "
			"counter=%ld\n", s->name, count, n->nr_partial);

	if (!(s->flags & SLAB_STORE_USER))
		goto out;

	list_for_each_entry(page, &n->full, lru) {
		validate_slab_slab(s, page, map);
		count++;
	}
	if (count != atomic_long_read(&n->nr_slabs))
		printk(KERN_ERR "SLUB: %s %ld slabs counted but "
			"counter=%ld\n", s->name, count,
			atomic_long_read(&n->nr_slabs));

out:
	spin_unlock_irqrestore(&n->list_lock, flags);
	return count;
}

static long validate_slab_cache(struct kmem_cache *s)
{
	int node;
	unsigned long count = 0;
	unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) *
				sizeof(unsigned long), GFP_KERNEL);

	if (!map)
		return -ENOMEM;

	flush_all(s);
	for_each_node_state(node, N_NORMAL_MEMORY) {
		struct kmem_cache_node *n = get_node(s, node);

		count += validate_slab_node(s, n, map);
	}
	kfree(map);
	return count;
}

#ifdef SLUB_RESILIENCY_TEST
static void resiliency_test(void)
{
	u8 *p;

	printk(KERN_ERR "SLUB resiliency testing\n");
	printk(KERN_ERR "-----------------------\n");
	printk(KERN_ERR "A. Corruption after allocation\n");

	p = kzalloc(16, GFP_KERNEL);
	p[16] = 0x12;
	printk(KERN_ERR "\n1. kmalloc-16: Clobber Redzone/next pointer"
			" 0x12->0x%p\n\n", p + 16);

	validate_slab_cache(kmalloc_caches + 4);

	/* Hmmm... The next two are dangerous */
	p = kzalloc(32, GFP_KERNEL);
	p[32 + sizeof(void *)] = 0x34;
	printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab"
			" 0x34 -> -0x%p\n", p);
	printk(KERN_ERR
		"If allocated object is overwritten then not detectable\n\n");

	validate_slab_cache(kmalloc_caches + 5);
	p = kzalloc(64, GFP_KERNEL);
	p += 64 + (get_cycles() & 0xff) * sizeof(void *);
	*p = 0x56;
	printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
									p);
	printk(KERN_ERR
		"If allocated object is overwritten then not detectable\n\n");
	validate_slab_cache(kmalloc_caches + 6);

	printk(KERN_ERR "\nB. Corruption after free\n");
	p = kzalloc(128, GFP_KERNEL);
	kfree(p);
	*p = 0x78;
	printk(KERN_ERR "1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p);
	validate_slab_cache(kmalloc_caches + 7);

	p = kzalloc(256, GFP_KERNEL);
	kfree(p);
	p[50] = 0x9a;
	printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n",
			p);
	validate_slab_cache(kmalloc_caches + 8);

	p = kzalloc(512, GFP_KERNEL);
	kfree(p);
	p[512] = 0xab;
	printk(KERN_ERR "\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p);
	validate_slab_cache(kmalloc_caches + 9);
}
#else
static void resiliency_test(void) {};
#endif

/*
 * Generate lists of code addresses where slabcache objects are allocated
 * and freed.
 */

struct location {
	unsigned long count;
	unsigned long addr;
	long long sum_time;
	long min_time;
	long max_time;
	long min_pid;
	long max_pid;
	DECLARE_BITMAP(cpus, NR_CPUS);
	nodemask_t nodes;
};

struct loc_track {
	unsigned long max;
	unsigned long count;
	struct location *loc;
};

static void free_loc_track(struct loc_track *t)
{
	if (t->max)
		free_pages((unsigned long)t->loc,
			get_order(sizeof(struct location) * t->max));
}

static int alloc_loc_track(struct loc_track *t, unsigned long max, gfp_t flags)
{
	struct location *l;
	int order;

	order = get_order(sizeof(struct location) * max);

	l = (void *)__get_free_pages(flags, order);
	if (!l)
		return 0;

	if (t->count) {
		memcpy(l, t->loc, sizeof(struct location) * t->count);
		free_loc_track(t);
	}
	t->max = max;
	t->loc = l;
	return 1;
}

static int add_location(struct loc_track *t, struct kmem_cache *s,
				const struct track *track)
{
	long start, end, pos;
	struct location *l;
	unsigned long caddr;
	unsigned long age = jiffies - track->when;

	start = -1;
	end = t->count;

	for ( ; ; ) {
		pos = start + (end - start + 1) / 2;

		/*
		 * There is nothing at "end". If we end up there
		 * we need to add something to before end.
		 */
		if (pos == end)
			break;

		caddr = t->loc[pos].addr;
		if (track->addr == caddr) {

			l = &t->loc[pos];
			l->count++;
			if (track->when) {
				l->sum_time += age;
				if (age < l->min_time)
					l->min_time = age;
				if (age > l->max_time)
					l->max_time = age;

				if (track->pid < l->min_pid)
					l->min_pid = track->pid;
				if (track->pid > l->max_pid)
					l->max_pid = track->pid;

				cpumask_set_cpu(track->cpu,
						to_cpumask(l->cpus));
			}
			node_set(page_to_nid(virt_to_page(track)), l->nodes);
			return 1;
		}

		if (track->addr < caddr)
			end = pos;
		else
			start = pos;
	}

	/*
	 * Not found. Insert new tracking element.
	 */
	if (t->count >= t->max && !alloc_loc_track(t, 2 * t->max, GFP_ATOMIC))
		return 0;

	l = t->loc + pos;
	if (pos < t->count)
		memmove(l + 1, l,
			(t->count - pos) * sizeof(struct location));
	t->count++;
	l->count = 1;
	l->addr = track->addr;
	l->sum_time = age;
	l->min_time = age;
	l->max_time = age;
	l->min_pid = track->pid;
	l->max_pid = track->pid;
	cpumask_clear(to_cpumask(l->cpus));
	cpumask_set_cpu(track->cpu, to_cpumask(l->cpus));
	nodes_clear(l->nodes);
	node_set(page_to_nid(virt_to_page(track)), l->nodes);
	return 1;
}

static void process_slab(struct loc_track *t, struct kmem_cache *s,
		struct page *page, enum track_item alloc)
{
	void *addr = page_address(page);
	DECLARE_BITMAP(map, page->objects);
	void *p;

	bitmap_zero(map, page->objects);
	for_each_free_object(p, s, page->freelist)
		set_bit(slab_index(p, s, addr), map);

	for_each_object(p, s, addr, page->objects)
		if (!test_bit(slab_index(p, s, addr), map))
			add_location(t, s, get_track(s, p, alloc));
}

static int list_locations(struct kmem_cache *s, char *buf,
					enum track_item alloc)
{
	int len = 0;
	unsigned long i;
	struct loc_track t = { 0, 0, NULL };
	int node;

	if (!alloc_loc_track(&t, PAGE_SIZE / sizeof(struct location),
			GFP_TEMPORARY))
		return sprintf(buf, "Out of memory\n");

	/* Push back cpu slabs */
	flush_all(s);

	for_each_node_state(node, N_NORMAL_MEMORY) {
		struct kmem_cache_node *n = get_node(s, node);
		unsigned long flags;
		struct page *page;

		if (!atomic_long_read(&n->nr_slabs))
			continue;

		spin_lock_irqsave(&n->list_lock, flags);
		list_for_each_entry(page, &n->partial, lru)
			process_slab(&t, s, page, alloc);
		list_for_each_entry(page, &n->full, lru)
			process_slab(&t, s, page, alloc);
		spin_unlock_irqrestore(&n->list_lock, flags);
	}

	for (i = 0; i < t.count; i++) {
		struct location *l = &t.loc[i];

		if (len > PAGE_SIZE - KSYM_SYMBOL_LEN - 100)
			break;
		len += sprintf(buf + len, "%7ld ", l->count);

		if (l->addr)
			len += sprint_symbol(buf + len, (unsigned long)l->addr);
		else
			len += sprintf(buf + len, "<not-available>");

		if (l->sum_time != l->min_time) {
			len += sprintf(buf + len, " age=%ld/%ld/%ld",
				l->min_time,
				(long)div_u64(l->sum_time, l->count),
				l->max_time);
		} else
			len += sprintf(buf + len, " age=%ld",
				l->min_time);

		if (l->min_pid != l->max_pid)
			len += sprintf(buf + len, " pid=%ld-%ld",
				l->min_pid, l->max_pid);
		else
			len += sprintf(buf + len, " pid=%ld",
				l->min_pid);

		if (num_online_cpus() > 1 &&
				!cpumask_empty(to_cpumask(l->cpus)) &&
				len < PAGE_SIZE - 60) {
			len += sprintf(buf + len, " cpus=");
			len += cpulist_scnprintf(buf + len, PAGE_SIZE - len - 50,
						 to_cpumask(l->cpus));
		}

		if (nr_online_nodes > 1 && !nodes_empty(l->nodes) &&
				len < PAGE_SIZE - 60) {
			len += sprintf(buf + len, " nodes=");
			len += nodelist_scnprintf(buf + len, PAGE_SIZE - len - 50,
					l->nodes);
		}

		len += sprintf(buf + len, "\n");
	}

	free_loc_track(&t);
	if (!t.count)
		len += sprintf(buf, "No data\n");
	return len;
}

enum slab_stat_type {
	SL_ALL,			/* All slabs */
	SL_PARTIAL,		/* Only partially allocated slabs */
	SL_CPU,			/* Only slabs used for cpu caches */
	SL_OBJECTS,		/* Determine allocated objects not slabs */
	SL_TOTAL		/* Determine object capacity not slabs */
};

#define SO_ALL		(1 << SL_ALL)
#define SO_PARTIAL	(1 << SL_PARTIAL)
#define SO_CPU		(1 << SL_CPU)
#define SO_OBJECTS	(1 << SL_OBJECTS)
#define SO_TOTAL	(1 << SL_TOTAL)

static ssize_t show_slab_objects(struct kmem_cache *s,
			    char *buf, unsigned long flags)
{
	unsigned long total = 0;
	int node;
	int x;
	unsigned long *nodes;
	unsigned long *per_cpu;

	nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
	if (!nodes)
		return -ENOMEM;
	per_cpu = nodes + nr_node_ids;

	if (flags & SO_CPU) {
		int cpu;

		for_each_possible_cpu(cpu) {
			struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);

			if (!c || c->node < 0)
				continue;

			if (c->page) {
					if (flags & SO_TOTAL)
						x = c->page->objects;
				else if (flags & SO_OBJECTS)
					x = c->page->inuse;
				else
					x = 1;

				total += x;
				nodes[c->node] += x;
			}
			per_cpu[c->node]++;
		}
	}

	if (flags & SO_ALL) {
		for_each_node_state(node, N_NORMAL_MEMORY) {
			struct kmem_cache_node *n = get_node(s, node);

		if (flags & SO_TOTAL)
			x = atomic_long_read(&n->total_objects);
		else if (flags & SO_OBJECTS)
			x = atomic_long_read(&n->total_objects) -
				count_partial(n, count_free);

			else
				x = atomic_long_read(&n->nr_slabs);
			total += x;
			nodes[node] += x;
		}

	} else if (flags & SO_PARTIAL) {
		for_each_node_state(node, N_NORMAL_MEMORY) {
			struct kmem_cache_node *n = get_node(s, node);

			if (flags & SO_TOTAL)
				x = count_partial(n, count_total);
			else if (flags & SO_OBJECTS)
				x = count_partial(n, count_inuse);
			else
				x = n->nr_partial;
			total += x;
			nodes[node] += x;
		}
	}
	x = sprintf(buf, "%lu", total);
#ifdef CONFIG_NUMA
	for_each_node_state(node, N_NORMAL_MEMORY)
		if (nodes[node])
			x += sprintf(buf + x, " N%d=%lu",
					node, nodes[node]);
#endif
	kfree(nodes);
	return x + sprintf(buf + x, "\n");
}

static int any_slab_objects(struct kmem_cache *s)
{
	int node;

	for_each_online_node(node) {
		struct kmem_cache_node *n = get_node(s, node);

		if (!n)
			continue;

		if (atomic_long_read(&n->total_objects))
			return 1;
	}
	return 0;
}

#define to_slab_attr(n) container_of(n, struct slab_attribute, attr)
#define to_slab(n) container_of(n, struct kmem_cache, kobj);

struct slab_attribute {
	struct attribute attr;
	ssize_t (*show)(struct kmem_cache *s, char *buf);
	ssize_t (*store)(struct kmem_cache *s, const char *x, size_t count);
};

#define SLAB_ATTR_RO(_name) \
	static struct slab_attribute _name##_attr = __ATTR_RO(_name)

#define SLAB_ATTR(_name) \
	static struct slab_attribute _name##_attr =  \
	__ATTR(_name, 0644, _name##_show, _name##_store)

static ssize_t slab_size_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", s->size);
}
SLAB_ATTR_RO(slab_size);

static ssize_t align_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", s->align);
}
SLAB_ATTR_RO(align);

static ssize_t object_size_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", s->objsize);
}
SLAB_ATTR_RO(object_size);

static ssize_t objs_per_slab_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", oo_objects(s->oo));
}
SLAB_ATTR_RO(objs_per_slab);

static ssize_t order_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	unsigned long order;
	int err;

	err = strict_strtoul(buf, 10, &order);
	if (err)
		return err;

	if (order > slub_max_order || order < slub_min_order)
		return -EINVAL;

	calculate_sizes(s, order);
	return length;
}

static ssize_t order_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", oo_order(s->oo));
}
SLAB_ATTR(order);

static ssize_t min_partial_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%lu\n", s->min_partial);
}

static ssize_t min_partial_store(struct kmem_cache *s, const char *buf,
				 size_t length)
{
	unsigned long min;
	int err;

	err = strict_strtoul(buf, 10, &min);
	if (err)
		return err;

	set_min_partial(s, min);
	return length;
}
SLAB_ATTR(min_partial);

static ssize_t ctor_show(struct kmem_cache *s, char *buf)
{
	if (s->ctor) {
		int n = sprint_symbol(buf, (unsigned long)s->ctor);

		return n + sprintf(buf + n, "\n");
	}
	return 0;
}
SLAB_ATTR_RO(ctor);

static ssize_t aliases_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", s->refcount - 1);
}
SLAB_ATTR_RO(aliases);

static ssize_t slabs_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_ALL);
}
SLAB_ATTR_RO(slabs);

static ssize_t partial_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_PARTIAL);
}
SLAB_ATTR_RO(partial);

static ssize_t cpu_slabs_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_CPU);
}
SLAB_ATTR_RO(cpu_slabs);

static ssize_t objects_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS);
}
SLAB_ATTR_RO(objects);

static ssize_t objects_partial_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS);
}
SLAB_ATTR_RO(objects_partial);

static ssize_t total_objects_show(struct kmem_cache *s, char *buf)
{
	return show_slab_objects(s, buf, SO_ALL|SO_TOTAL);
}
SLAB_ATTR_RO(total_objects);

static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE));
}

static ssize_t sanity_checks_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	s->flags &= ~SLAB_DEBUG_FREE;
	if (buf[0] == '1')
		s->flags |= SLAB_DEBUG_FREE;
	return length;
}
SLAB_ATTR(sanity_checks);

static ssize_t trace_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_TRACE));
}

static ssize_t trace_store(struct kmem_cache *s, const char *buf,
							size_t length)
{
	s->flags &= ~SLAB_TRACE;
	if (buf[0] == '1')
		s->flags |= SLAB_TRACE;
	return length;
}
SLAB_ATTR(trace);

static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT));
}

static ssize_t reclaim_account_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	s->flags &= ~SLAB_RECLAIM_ACCOUNT;
	if (buf[0] == '1')
		s->flags |= SLAB_RECLAIM_ACCOUNT;
	return length;
}
SLAB_ATTR(reclaim_account);

static ssize_t hwcache_align_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_HWCACHE_ALIGN));
}
SLAB_ATTR_RO(hwcache_align);

#ifdef CONFIG_ZONE_DMA
static ssize_t cache_dma_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA));
}
SLAB_ATTR_RO(cache_dma);
#endif

static ssize_t destroy_by_rcu_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_DESTROY_BY_RCU));
}
SLAB_ATTR_RO(destroy_by_rcu);

static ssize_t red_zone_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_RED_ZONE));
}

static ssize_t red_zone_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	if (any_slab_objects(s))
		return -EBUSY;

	s->flags &= ~SLAB_RED_ZONE;
	if (buf[0] == '1')
		s->flags |= SLAB_RED_ZONE;
	calculate_sizes(s, -1);
	return length;
}
SLAB_ATTR(red_zone);

static ssize_t poison_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_POISON));
}

static ssize_t poison_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	if (any_slab_objects(s))
		return -EBUSY;

	s->flags &= ~SLAB_POISON;
	if (buf[0] == '1')
		s->flags |= SLAB_POISON;
	calculate_sizes(s, -1);
	return length;
}
SLAB_ATTR(poison);

static ssize_t store_user_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", !!(s->flags & SLAB_STORE_USER));
}

static ssize_t store_user_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	if (any_slab_objects(s))
		return -EBUSY;

	s->flags &= ~SLAB_STORE_USER;
	if (buf[0] == '1')
		s->flags |= SLAB_STORE_USER;
	calculate_sizes(s, -1);
	return length;
}
SLAB_ATTR(store_user);

static ssize_t validate_show(struct kmem_cache *s, char *buf)
{
	return 0;
}

static ssize_t validate_store(struct kmem_cache *s,
			const char *buf, size_t length)
{
	int ret = -EINVAL;

	if (buf[0] == '1') {
		ret = validate_slab_cache(s);
		if (ret >= 0)
			ret = length;
	}
	return ret;
}
SLAB_ATTR(validate);

static ssize_t shrink_show(struct kmem_cache *s, char *buf)
{
	return 0;
}

static ssize_t shrink_store(struct kmem_cache *s,
			const char *buf, size_t length)
{
	if (buf[0] == '1') {
		int rc = kmem_cache_shrink(s);

		if (rc)
			return rc;
	} else
		return -EINVAL;
	return length;
}
SLAB_ATTR(shrink);

static ssize_t alloc_calls_show(struct kmem_cache *s, char *buf)
{
	if (!(s->flags & SLAB_STORE_USER))
		return -ENOSYS;
	return list_locations(s, buf, TRACK_ALLOC);
}
SLAB_ATTR_RO(alloc_calls);

static ssize_t free_calls_show(struct kmem_cache *s, char *buf)
{
	if (!(s->flags & SLAB_STORE_USER))
		return -ENOSYS;
	return list_locations(s, buf, TRACK_FREE);
}
SLAB_ATTR_RO(free_calls);

#ifdef CONFIG_NUMA
static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf)
{
	return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10);
}

static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s,
				const char *buf, size_t length)
{
	unsigned long ratio;
	int err;

	err = strict_strtoul(buf, 10, &ratio);
	if (err)
		return err;

	if (ratio <= 100)
		s->remote_node_defrag_ratio = ratio * 10;

	return length;
}
SLAB_ATTR(remote_node_defrag_ratio);
#endif

#ifdef CONFIG_SLUB_STATS
static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si)
{
	unsigned long sum  = 0;
	int cpu;
	int len;
	int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL);

	if (!data)
		return -ENOMEM;

	for_each_online_cpu(cpu) {
		unsigned x = get_cpu_slab(s, cpu)->stat[si];

		data[cpu] = x;
		sum += x;
	}

	len = sprintf(buf, "%lu", sum);

#ifdef CONFIG_SMP
	for_each_online_cpu(cpu) {
		if (data[cpu] && len < PAGE_SIZE - 20)
			len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]);
	}
#endif
	kfree(data);
	return len + sprintf(buf + len, "\n");
}

#define STAT_ATTR(si, text) 					\
static ssize_t text##_show(struct kmem_cache *s, char *buf)	\
{								\
	return show_stat(s, buf, si);				\
}								\
SLAB_ATTR_RO(text);						\

STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath);
STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath);
STAT_ATTR(FREE_FASTPATH, free_fastpath);
STAT_ATTR(FREE_SLOWPATH, free_slowpath);
STAT_ATTR(FREE_FROZEN, free_frozen);
STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial);
STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial);
STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial);
STAT_ATTR(ALLOC_SLAB, alloc_slab);
STAT_ATTR(ALLOC_REFILL, alloc_refill);
STAT_ATTR(FREE_SLAB, free_slab);
STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush);
STAT_ATTR(DEACTIVATE_FULL, deactivate_full);
STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty);
STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head);
STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail);
STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees);
STAT_ATTR(ORDER_FALLBACK, order_fallback);
#endif

static struct attribute *slab_attrs[] = {
	&slab_size_attr.attr,
	&object_size_attr.attr,
	&objs_per_slab_attr.attr,
	&order_attr.attr,
	&min_partial_attr.attr,
	&objects_attr.attr,
	&objects_partial_attr.attr,
	&total_objects_attr.attr,
	&slabs_attr.attr,
	&partial_attr.attr,
	&cpu_slabs_attr.attr,
	&ctor_attr.attr,
	&aliases_attr.attr,
	&align_attr.attr,
	&sanity_checks_attr.attr,
	&trace_attr.attr,
	&hwcache_align_attr.attr,
	&reclaim_account_attr.attr,
	&destroy_by_rcu_attr.attr,
	&red_zone_attr.attr,
	&poison_attr.attr,
	&store_user_attr.attr,
	&validate_attr.attr,
	&shrink_attr.attr,
	&alloc_calls_attr.attr,
	&free_calls_attr.attr,
#ifdef CONFIG_ZONE_DMA
	&cache_dma_attr.attr,
#endif
#ifdef CONFIG_NUMA
	&remote_node_defrag_ratio_attr.attr,
#endif
#ifdef CONFIG_SLUB_STATS
	&alloc_fastpath_attr.attr,
	&alloc_slowpath_attr.attr,
	&free_fastpath_attr.attr,
	&free_slowpath_attr.attr,
	&free_frozen_attr.attr,
	&free_add_partial_attr.attr,
	&free_remove_partial_attr.attr,
	&alloc_from_partial_attr.attr,
	&alloc_slab_attr.attr,
	&alloc_refill_attr.attr,
	&free_slab_attr.attr,
	&cpuslab_flush_attr.attr,
	&deactivate_full_attr.attr,
	&deactivate_empty_attr.attr,
	&deactivate_to_head_attr.attr,
	&deactivate_to_tail_attr.attr,
	&deactivate_remote_frees_attr.attr,
	&order_fallback_attr.attr,
#endif
	NULL
};

static struct attribute_group slab_attr_group = {
	.attrs = slab_attrs,
};

static ssize_t slab_attr_show(struct kobject *kobj,
				struct attribute *attr,
				char *buf)
{
	struct slab_attribute *attribute;
	struct kmem_cache *s;
	int err;

	attribute = to_slab_attr(attr);
	s = to_slab(kobj);

	if (!attribute->show)
		return -EIO;

	err = attribute->show(s, buf);

	return err;
}

static ssize_t slab_attr_store(struct kobject *kobj,
				struct attribute *attr,
				const char *buf, size_t len)
{
	struct slab_attribute *attribute;
	struct kmem_cache *s;
	int err;

	attribute = to_slab_attr(attr);
	s = to_slab(kobj);

	if (!attribute->store)
		return -EIO;

	err = attribute->store(s, buf, len);

	return err;
}

static void kmem_cache_release(struct kobject *kobj)
{
	struct kmem_cache *s = to_slab(kobj);

	kfree(s);
}

static struct sysfs_ops slab_sysfs_ops = {
	.show = slab_attr_show,
	.store = slab_attr_store,
};

static struct kobj_type slab_ktype = {
	.sysfs_ops = &slab_sysfs_ops,
	.release = kmem_cache_release
};

static int uevent_filter(struct kset *kset, struct kobject *kobj)
{
	struct kobj_type *ktype = get_ktype(kobj);

	if (ktype == &slab_ktype)
		return 1;
	return 0;
}

static struct kset_uevent_ops slab_uevent_ops = {
	.filter = uevent_filter,
};

static struct kset *slab_kset;

#define ID_STR_LENGTH 64

/* Create a unique string id for a slab cache:
 *
 * Format	:[flags-]size
 */
static char *create_unique_id(struct kmem_cache *s)
{
	char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL);
	char *p = name;

	BUG_ON(!name);

	*p++ = ':';
	/*
	 * First flags affecting slabcache operations. We will only
	 * get here for aliasable slabs so we do not need to support
	 * too many flags. The flags here must cover all flags that
	 * are matched during merging to guarantee that the id is
	 * unique.
	 */
	if (s->flags & SLAB_CACHE_DMA)
		*p++ = 'd';
	if (s->flags & SLAB_RECLAIM_ACCOUNT)
		*p++ = 'a';
	if (s->flags & SLAB_DEBUG_FREE)
		*p++ = 'F';
	if (!(s->flags & SLAB_NOTRACK))
		*p++ = 't';
	if (p != name + 1)
		*p++ = '-';
	p += sprintf(p, "%07d", s->size);
	BUG_ON(p > name + ID_STR_LENGTH - 1);
	return name;
}

static int sysfs_slab_add(struct kmem_cache *s)
{
	int err;
	const char *name;
	int unmergeable;

	if (slab_state < SYSFS)
		/* Defer until later */
		return 0;

	unmergeable = slab_unmergeable(s);
	if (unmergeable) {
		/*
		 * Slabcache can never be merged so we can use the name proper.
		 * This is typically the case for debug situations. In that
		 * case we can catch duplicate names easily.
		 */
		sysfs_remove_link(&slab_kset->kobj, s->name);
		name = s->name;
	} else {
		/*
		 * Create a unique name for the slab as a target
		 * for the symlinks.
		 */
		name = create_unique_id(s);
	}

	s->kobj.kset = slab_kset;
	err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, name);
	if (err) {
		kobject_put(&s->kobj);
		return err;
	}

	err = sysfs_create_group(&s->kobj, &slab_attr_group);
	if (err) {
		kobject_del(&s->kobj);
		kobject_put(&s->kobj);
		return err;
	}
	kobject_uevent(&s->kobj, KOBJ_ADD);
	if (!unmergeable) {
		/* Setup first alias */
		sysfs_slab_alias(s, s->name);
		kfree(name);
	}
	return 0;
}

static void sysfs_slab_remove(struct kmem_cache *s)
{
	kobject_uevent(&s->kobj, KOBJ_REMOVE);
	kobject_del(&s->kobj);
	kobject_put(&s->kobj);
}

/*
 * Need to buffer aliases during bootup until sysfs becomes
 * available lest we lose that information.
 */
struct saved_alias {
	struct kmem_cache *s;
	const char *name;
	struct saved_alias *next;
};

static struct saved_alias *alias_list;

static int sysfs_slab_alias(struct kmem_cache *s, const char *name)
{
	struct saved_alias *al;

	if (slab_state == SYSFS) {
		/*
		 * If we have a leftover link then remove it.
		 */
		sysfs_remove_link(&slab_kset->kobj, name);
		return sysfs_create_link(&slab_kset->kobj, &s->kobj, name);
	}

	al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL);
	if (!al)
		return -ENOMEM;

	al->s = s;
	al->name = name;
	al->next = alias_list;
	alias_list = al;
	return 0;
}

static int __init slab_sysfs_init(void)
{
	struct kmem_cache *s;
	int err;

	slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj);
	if (!slab_kset) {
		printk(KERN_ERR "Cannot register slab subsystem.\n");
		return -ENOSYS;
	}

	slab_state = SYSFS;

	list_for_each_entry(s, &slab_caches, list) {
		err = sysfs_slab_add(s);
		if (err)
			printk(KERN_ERR "SLUB: Unable to add boot slab %s"
						" to sysfs\n", s->name);
	}

	while (alias_list) {
		struct saved_alias *al = alias_list;

		alias_list = alias_list->next;
		err = sysfs_slab_alias(al->s, al->name);
		if (err)
			printk(KERN_ERR "SLUB: Unable to add boot slab alias"
					" %s to sysfs\n", s->name);
		kfree(al);
	}

	resiliency_test();
	return 0;
}

__initcall(slab_sysfs_init);
#endif

/*
 * The /proc/slabinfo ABI
 */
#ifdef CONFIG_SLABINFO
static void print_slabinfo_header(struct seq_file *m)
{
	seq_puts(m, "slabinfo - version: 2.1\n");
	seq_puts(m, "# name            <active_objs> <num_objs> <objsize> "
		 "<objperslab> <pagesperslab>");
	seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
	seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
	seq_putc(m, '\n');
}

static void *s_start(struct seq_file *m, loff_t *pos)
{
	loff_t n = *pos;

	down_read(&slub_lock);
	if (!n)
		print_slabinfo_header(m);

	return seq_list_start(&slab_caches, *pos);
}

static void *s_next(struct seq_file *m, void *p, loff_t *pos)
{
	return seq_list_next(p, &slab_caches, pos);
}

static void s_stop(struct seq_file *m, void *p)
{
	up_read(&slub_lock);
}

static int s_show(struct seq_file *m, void *p)
{
	unsigned long nr_partials = 0;
	unsigned long nr_slabs = 0;
	unsigned long nr_inuse = 0;
	unsigned long nr_objs = 0;
	unsigned long nr_free = 0;
	struct kmem_cache *s;
	int node;

	s = list_entry(p, struct kmem_cache, list);

	for_each_online_node(node) {
		struct kmem_cache_node *n = get_node(s, node);

		if (!n)
			continue;

		nr_partials += n->nr_partial;
		nr_slabs += atomic_long_read(&n->nr_slabs);
		nr_objs += atomic_long_read(&n->total_objects);
		nr_free += count_partial(n, count_free);
	}

	nr_inuse = nr_objs - nr_free;

	seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", s->name, nr_inuse,
		   nr_objs, s->size, oo_objects(s->oo),
		   (1 << oo_order(s->oo)));
	seq_printf(m, " : tunables %4u %4u %4u", 0, 0, 0);
	seq_printf(m, " : slabdata %6lu %6lu %6lu", nr_slabs, nr_slabs,
		   0UL);
	seq_putc(m, '\n');
	return 0;
}

static const struct seq_operations slabinfo_op = {
	.start = s_start,
	.next = s_next,
	.stop = s_stop,
	.show = s_show,
};

static int slabinfo_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &slabinfo_op);
}

static const struct file_operations proc_slabinfo_operations = {
	.open		= slabinfo_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int __init slab_proc_init(void)
{
	proc_create("slabinfo", S_IRUGO, NULL, &proc_slabinfo_operations);
	return 0;
}
module_init(slab_proc_init);
#endif /* CONFIG_SLABINFO */