linux/kernel.h: import more macros

These macros seem to be useful for U-Boot too (or at least harmless). Imported from Linux 3.18-rc2. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

linux/kernel.h: import more macros
These macros seem to be useful for U-Boot too (or at least harmless). Imported from Linux 3.18-rc2. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Masahiro Yamada · Tom Rini
1 parent cba1da495d
Showing 1 changed file with 92 additions and 0 deletions Side-by-side Diff
include/linux/kernel.h
@@ -4,16 +4,41 @@
  
 #include <linux/types.h>
  
+#define USHRT_MAX	((u16)(~0U))
+#define SHRT_MAX	((s16)(USHRT_MAX>>1))
+#define SHRT_MIN	((s16)(-SHRT_MAX - 1))
 #define INT_MAX		((int)(~0U>>1))
 #define INT_MIN		(-INT_MAX - 1)
+#define UINT_MAX	(~0U)
+#define LONG_MAX	((long)(~0UL>>1))
+#define LONG_MIN	(-LONG_MAX - 1)
+#define ULONG_MAX	(~0UL)
 #define LLONG_MAX	((long long)(~0ULL>>1))
+#define LLONG_MIN	(-LLONG_MAX - 1)
+#define ULLONG_MAX	(~0ULL)
+#define SIZE_MAX	(~(size_t)0)
  
 #define U8_MAX		((u8)~0U)
+#define S8_MAX		((s8)(U8_MAX>>1))
+#define S8_MIN		((s8)(-S8_MAX - 1))
+#define U16_MAX		((u16)~0U)
+#define S16_MAX		((s16)(U16_MAX>>1))
+#define S16_MIN		((s16)(-S16_MAX - 1))
 #define U32_MAX		((u32)~0U)
+#define S32_MAX		((s32)(U32_MAX>>1))
+#define S32_MIN		((s32)(-S32_MAX - 1))
 #define U64_MAX		((u64)~0ULL)
+#define S64_MAX		((s64)(U64_MAX>>1))
+#define S64_MIN		((s64)(-S64_MAX - 1))
  
+#define STACK_MAGIC	0xdeadbeef
+
+#define REPEAT_BYTE(x)	((~0ul / 0xff) * (x))
+
 #define ALIGN(x,a)		__ALIGN_MASK((x),(typeof(x))(a)-1)
 #define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
+#define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
+#define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)
  
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  
  
  
@@ -27,10 +52,24 @@
 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 #define round_down(x, y) ((x) & ~__round_mask(x, y))
  
+#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  
+#if BITS_PER_LONG == 32
+# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
+#else
+# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
+#endif
+
 #define roundup(x, y)		((((x) + ((y) - 1)) / (y)) * (y))
  
+#define rounddown(x, y) (				\
+{							\
+	typeof(x) __x = (x);				\
+	__x - (__x % (y));				\
+}							\
+)
+
 /*
  * Divide positive or negative dividend by positive divisor and round
  * to closest integer. Result is undefined for negative divisors and
@@ -127,6 +166,27 @@
 	_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
 		(_max2 > _max3 ? _max2 : _max3); })
  
+/**
+ * min_not_zero - return the minimum that is _not_ zero, unless both are zero
+ * @x: value1
+ * @y: value2
+ */
+#define min_not_zero(x, y) ({			\
+	typeof(x) __x = (x);			\
+	typeof(y) __y = (y);			\
+	__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
+
+/**
+ * clamp - return a value clamped to a given range with strict typechecking
+ * @val: current value
+ * @lo: lowest allowable value
+ * @hi: highest allowable value
+ *
+ * This macro does strict typechecking of lo/hi to make sure they are of the
+ * same type as val.  See the unnecessary pointer comparisons.
+ */
+#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
+
 /*
  * ..and if you can't take the strict
  * types, you can specify one yourself.
@@ -142,6 +202,38 @@
 	type __max1 = (x);			\
 	type __max2 = (y);			\
 	__max1 > __max2 ? __max1: __max2; })
+
+/**
+ * clamp_t - return a value clamped to a given range using a given type
+ * @type: the type of variable to use
+ * @val: current value
+ * @lo: minimum allowable value
+ * @hi: maximum allowable value
+ *
+ * This macro does no typechecking and uses temporary variables of type
+ * 'type' to make all the comparisons.
+ */
+#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
+
+/**
+ * clamp_val - return a value clamped to a given range using val's type
+ * @val: current value
+ * @lo: minimum allowable value
+ * @hi: maximum allowable value
+ *
+ * This macro does no typechecking and uses temporary variables of whatever
+ * type the input argument 'val' is.  This is useful when val is an unsigned
+ * type and min and max are literals that will otherwise be assigned a signed
+ * integer type.
+ */
+#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
+
+
+/*
+ * swap - swap value of @a and @b
+ */
+#define swap(a, b) \
+	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
  
 /**
  * container_of - cast a member of a structure out to the containing structure
...	...	@@ -4,16 +4,41 @@
4	4
5	5	#include <linux/types.h>
6	6
	7	+#define USHRT_MAX ((u16)(~0U))
	8	+#define SHRT_MAX ((s16)(USHRT_MAX>>1))
	9	+#define SHRT_MIN ((s16)(-SHRT_MAX - 1))
7	10	#define INT_MAX ((int)(~0U>>1))
8	11	#define INT_MIN (-INT_MAX - 1)
	12	+#define UINT_MAX (~0U)
	13	+#define LONG_MAX ((long)(~0UL>>1))
	14	+#define LONG_MIN (-LONG_MAX - 1)
	15	+#define ULONG_MAX (~0UL)
9	16	#define LLONG_MAX ((long long)(~0ULL>>1))
	17	+#define LLONG_MIN (-LLONG_MAX - 1)
	18	+#define ULLONG_MAX (~0ULL)
	19	+#define SIZE_MAX (~(size_t)0)
10	20
11	21	#define U8_MAX ((u8)~0U)
	22	+#define S8_MAX ((s8)(U8_MAX>>1))
	23	+#define S8_MIN ((s8)(-S8_MAX - 1))
	24	+#define U16_MAX ((u16)~0U)
	25	+#define S16_MAX ((s16)(U16_MAX>>1))
	26	+#define S16_MIN ((s16)(-S16_MAX - 1))
12	27	#define U32_MAX ((u32)~0U)
	28	+#define S32_MAX ((s32)(U32_MAX>>1))
	29	+#define S32_MIN ((s32)(-S32_MAX - 1))
13	30	#define U64_MAX ((u64)~0ULL)
	31	+#define S64_MAX ((s64)(U64_MAX>>1))
	32	+#define S64_MIN ((s64)(-S64_MAX - 1))
14	33
	34	+#define STACK_MAGIC 0xdeadbeef
	35	+
	36	+#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
	37	+
15	38	#define ALIGN(x,a) __ALIGN_MASK((x),(typeof(x))(a)-1)
16	39	#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
	40	+#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
	41	+#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
17	42
18	43	#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
19	44
20	45
21	46
...	...	@@ -27,10 +52,24 @@
27	52	#define round_up(x, y) ((((x)-1) \| __round_mask(x, y))+1)
28	53	#define round_down(x, y) ((x) & ~__round_mask(x, y))
29	54
	55	+#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
30	56	#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
31	57
	58	+#if BITS_PER_LONG == 32
	59	+# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP_ULL(ll, d)
	60	+#else
	61	+# define DIV_ROUND_UP_SECTOR_T(ll,d) DIV_ROUND_UP(ll,d)
	62	+#endif
	63	+
32	64	#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
33	65
	66	+#define rounddown(x, y) ( \
	67	+{ \
	68	+ typeof(x) __x = (x); \
	69	+ __x - (__x % (y)); \
	70	+} \
	71	+)
	72	+
34	73	/*
35	74	* Divide positive or negative dividend by positive divisor and round
36	75	* to closest integer. Result is undefined for negative divisors and
...	...	@@ -127,6 +166,27 @@
127	166	_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
128	167	(_max2 > _max3 ? _max2 : _max3); })
129	168
	169	+/**
	170	+ * min_not_zero - return the minimum that is _not_ zero, unless both are zero
	171	+ * @x: value1
	172	+ * @y: value2
	173	+ */
	174	+#define min_not_zero(x, y) ({ \
	175	+ typeof(x) __x = (x); \
	176	+ typeof(y) __y = (y); \
	177	+ __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
	178	+
	179	+/**
	180	+ * clamp - return a value clamped to a given range with strict typechecking
	181	+ * @val: current value
	182	+ * @lo: lowest allowable value
	183	+ * @hi: highest allowable value
	184	+ *
	185	+ * This macro does strict typechecking of lo/hi to make sure they are of the
	186	+ * same type as val. See the unnecessary pointer comparisons.
	187	+ */
	188	+#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
	189	+
130	190	/*
131	191	* ..and if you can't take the strict
132	192	* types, you can specify one yourself.
...	...	@@ -142,6 +202,38 @@
142	202	type __max1 = (x); \
143	203	type __max2 = (y); \
144	204	__max1 > __max2 ? __max1: __max2; })
	205	+
	206	+/**
	207	+ * clamp_t - return a value clamped to a given range using a given type
	208	+ * @type: the type of variable to use
	209	+ * @val: current value
	210	+ * @lo: minimum allowable value
	211	+ * @hi: maximum allowable value
	212	+ *
	213	+ * This macro does no typechecking and uses temporary variables of type
	214	+ * 'type' to make all the comparisons.
	215	+ */
	216	+#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
	217	+
	218	+/**
	219	+ * clamp_val - return a value clamped to a given range using val's type
	220	+ * @val: current value
	221	+ * @lo: minimum allowable value
	222	+ * @hi: maximum allowable value
	223	+ *
	224	+ * This macro does no typechecking and uses temporary variables of whatever
	225	+ * type the input argument 'val' is. This is useful when val is an unsigned
	226	+ * type and min and max are literals that will otherwise be assigned a signed
	227	+ * integer type.
	228	+ */
	229	+#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
	230	+
	231	+
	232	+/*
	233	+ * swap - swap value of @a and @b
	234	+ */
	235	+#define swap(a, b) \
	236	+ do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
145	237
146	238	/**
147	239	* container_of - cast a member of a structure out to the containing structure