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Commit f3beeb4a51d3aa16571e6c3774b929209e9956bf

Authored by Jiang Liu 2013-04-30 06:06:25 +0800

Committed by Linus Torvalds 2013-04-30 06:54:29 +0800

Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches

mm/alpha: use common help functions to free reserved pages

Use common help functions to free reserved pages.  Also include
<asm/sections.h> to avoid local declarations.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Showing 3 changed files with 6 additions and 26 deletions Inline Diff

arch/alpha/kernel/sys_nautilus.c
arch/alpha/mm/init.c
arch/alpha/mm/numa.c

arch/alpha/kernel/sys_nautilus.c

Diff comments View file @ f3beeb4

 /*
  *	linux/arch/alpha/kernel/sys_nautilus.c
  *
  *	Copyright (C) 1995 David A Rusling
  *	Copyright (C) 1998 Richard Henderson
  *	Copyright (C) 1999 Alpha Processor, Inc.,
  *		(David Daniel, Stig Telfer, Soohoon Lee)
  *
  * Code supporting NAUTILUS systems.
  *
  *
  * NAUTILUS has the following I/O features:
  *
  * a) Driven by AMD 751 aka IRONGATE (northbridge):
  *     4 PCI slots
  *     1 AGP slot
  *
  * b) Driven by ALI M1543C (southbridge)
  *     2 ISA slots
  *     2 IDE connectors
  *     1 dual drive capable FDD controller
  *     2 serial ports
  *     1 ECP/EPP/SP parallel port
  *     2 USB ports
  */
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/reboot.h>
 #include <linux/bootmem.h>
 #include <linux/bitops.h>
 #include <asm/ptrace.h>
 #include <asm/dma.h>
 #include <asm/irq.h>
 #include <asm/mmu_context.h>
 #include <asm/io.h>
 #include <asm/pci.h>
 #include <asm/pgtable.h>
 #include <asm/core_irongate.h>
 #include <asm/hwrpb.h>
 #include <asm/tlbflush.h>
 #include "proto.h"
 #include "err_impl.h"
 #include "irq_impl.h"
 #include "pci_impl.h"
 #include "machvec_impl.h"
 static void __init
 nautilus_init_irq(void)
 {
 	if (alpha_using_srm) {
 		alpha_mv.device_interrupt = srm_device_interrupt;
 	}
 	init_i8259a_irqs();
 	common_init_isa_dma();
 }
 static int __init
 nautilus_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	/* Preserve the IRQ set up by the console.  */
 	u8 irq;
 	/* UP1500: AGP INTA is actually routed to IRQ 5, not IRQ 10 as
 	   console reports. Check the device id of AGP bridge to distinguish
 	   UP1500 from UP1000/1100. Note: 'pin' is 2 due to bridge swizzle. */
 	if (slot == 1 && pin == 2 &&
 	    dev->bus->self && dev->bus->self->device == 0x700f)
 		return 5;
 	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
 	return irq;
 }
 void
 nautilus_kill_arch(int mode)
 {
 	struct pci_bus *bus = pci_isa_hose->bus;
 	u32 pmuport;
 	int off;
 	switch (mode) {
 	case LINUX_REBOOT_CMD_RESTART:
 		if (! alpha_using_srm) {
 			u8 t8;
 			pci_bus_read_config_byte(bus, 0x38, 0x43, &t8);
 			pci_bus_write_config_byte(bus, 0x38, 0x43, t8 | 0x80);
 			outb(1, 0x92);
 			outb(0, 0x92);
 			/* NOTREACHED */
 		}
 		break;
 	case LINUX_REBOOT_CMD_POWER_OFF:
 		/* Assume M1543C */
 		off = 0x2000;		/* SLP_TYPE = 0, SLP_EN = 1 */
 		pci_bus_read_config_dword(bus, 0x88, 0x10, &pmuport);
 		if (!pmuport) {
 			/* M1535D/D+ */
 			off = 0x3400;	/* SLP_TYPE = 5, SLP_EN = 1 */
 			pci_bus_read_config_dword(bus, 0x88, 0xe0, &pmuport);
 		}
 		pmuport &= 0xfffe;
 		outw(0xffff, pmuport);	/* Clear pending events. */
 		outw(off, pmuport + 4);
 		/* NOTREACHED */
 		break;
 	}
 }
 /* Perform analysis of a machine check that arrived from the system (NMI) */
 static void
 naut_sys_machine_check(unsigned long vector, unsigned long la_ptr,
 		       struct pt_regs *regs)
 {
 	printk("PC %lx RA %lx\n", regs->pc, regs->r26);
 	irongate_pci_clr_err();
 }
 /* Machine checks can come from two sources - those on the CPU and those
    in the system.  They are analysed separately but all starts here.  */
 void
 nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
 {
 	char *mchk_class;
 	/* Now for some analysis.  Machine checks fall into two classes --
 	   those picked up by the system, and those picked up by the CPU.
 	   Add to that the two levels of severity - correctable or not.  */
 	if (vector == SCB_Q_SYSMCHK
 	    && ((IRONGATE0->dramms & 0x300) == 0x300)) {
 		unsigned long nmi_ctl;
 		/* Clear ALI NMI */
 		nmi_ctl = inb(0x61);
 		nmi_ctl |= 0x0c;
 		outb(nmi_ctl, 0x61);
 		nmi_ctl &= ~0x0c;
 		outb(nmi_ctl, 0x61);
 		/* Write again clears error bits.  */
 		IRONGATE0->stat_cmd = IRONGATE0->stat_cmd & ~0x100;
 		mb();
 		IRONGATE0->stat_cmd;
 		/* Write again clears error bits.  */
 		IRONGATE0->dramms = IRONGATE0->dramms;
 		mb();
 		IRONGATE0->dramms;
 		draina();
 		wrmces(0x7);
 		mb();
 		return;
 	}
 	if (vector == SCB_Q_SYSERR)
 		mchk_class = "Correctable";
 	else if (vector == SCB_Q_SYSMCHK)
 		mchk_class = "Fatal";
 	else {
 		ev6_machine_check(vector, la_ptr);
 		return;
 	}
 	printk(KERN_CRIT "NAUTILUS Machine check 0x%lx "
 			 "[%s System Machine Check (NMI)]\n",
 	       vector, mchk_class);
 	naut_sys_machine_check(vector, la_ptr, get_irq_regs());
 	/* Tell the PALcode to clear the machine check */
 	draina();
 	wrmces(0x7);
 	mb();
 }
-extern void free_reserved_mem(void *, void *);
 extern void pcibios_claim_one_bus(struct pci_bus *);
 static struct resource irongate_io = {
 	.name	= "Irongate PCI IO",
 	.flags	= IORESOURCE_IO,
 };
 static struct resource irongate_mem = {
 	.name	= "Irongate PCI MEM",
 	.flags	= IORESOURCE_MEM,
 };
 void __init
 nautilus_init_pci(void)
 {
 	struct pci_controller *hose = hose_head;
 	struct pci_bus *bus;
 	struct pci_dev *irongate;
 	unsigned long bus_align, bus_size, pci_mem;
 	unsigned long memtop = max_low_pfn << PAGE_SHIFT;
 	/* Scan our single hose.  */
 	bus = pci_scan_bus(0, alpha_mv.pci_ops, hose);
 	hose->bus = bus;
 	pcibios_claim_one_bus(bus);
 	irongate = pci_get_bus_and_slot(0, 0);
 	bus->self = irongate;
 	bus->resource[0] = &irongate_io;
 	bus->resource[1] = &irongate_mem;
 	pci_bus_size_bridges(bus);
 	/* IO port range. */
 	bus->resource[0]->start = 0;
 	bus->resource[0]->end = 0xffff;
 	/* Set up PCI memory range - limit is hardwired to 0xffffffff,
 	   base must be at aligned to 16Mb. */
 	bus_align = bus->resource[1]->start;
 	bus_size = bus->resource[1]->end + 1 - bus_align;
 	if (bus_align < 0x1000000UL)
 		bus_align = 0x1000000UL;
 	pci_mem = (0x100000000UL - bus_size) & -bus_align;
 	bus->resource[1]->start = pci_mem;
 	bus->resource[1]->end = 0xffffffffUL;
 	if (request_resource(&iomem_resource, bus->resource[1]) < 0)
 		printk(KERN_ERR "Failed to request MEM on hose 0\n");
 	if (pci_mem < memtop)
 		memtop = pci_mem;
 	if (memtop > alpha_mv.min_mem_address) {
-		free_reserved_mem(__va(alpha_mv.min_mem_address),
+		free_reserved_area((unsigned long)__va(alpha_mv.min_mem_address),
-				  __va(memtop));
+				   (unsigned long)__va(memtop), 0, NULL);
 		printk("nautilus_init_pci: %ldk freed\n",
 			(memtop - alpha_mv.min_mem_address) >> 10);
 	}
 	if ((IRONGATE0->dev_vendor >> 16) > 0x7006)	/* Albacore? */
 		IRONGATE0->pci_mem = pci_mem;
 	pci_bus_assign_resources(bus);
 	/* pci_common_swizzle() relies on bus->self being NULL
 	   for the root bus, so just clear it. */
 	bus->self = NULL;
 	pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
 }
 /*
  * The System Vectors
  */
 struct alpha_machine_vector nautilus_mv __initmv = {
 	.vector_name		= "Nautilus",
 	DO_EV6_MMU,
 	DO_DEFAULT_RTC,
 	DO_IRONGATE_IO,
 	.machine_check		= nautilus_machine_check,
 	.max_isa_dma_address	= ALPHA_MAX_ISA_DMA_ADDRESS,
 	.min_io_address		= DEFAULT_IO_BASE,
 	.min_mem_address	= IRONGATE_DEFAULT_MEM_BASE,
 	.nr_irqs		= 16,
 	.device_interrupt	= isa_device_interrupt,
 	.init_arch		= irongate_init_arch,
 	.init_irq		= nautilus_init_irq,
 	.init_rtc		= common_init_rtc,
 	.init_pci		= nautilus_init_pci,
 	.kill_arch		= nautilus_kill_arch,
 	.pci_map_irq		= nautilus_map_irq,
 	.pci_swizzle		= common_swizzle,
 };
 ALIAS_MV(nautilus)

arch/alpha/mm/init.c

Diff comments View file @ f3beeb4

 /*
  *  linux/arch/alpha/mm/init.c
  *
  *  Copyright (C) 1995  Linus Torvalds
  */
 /* 2.3.x zone allocator, 1999 Andrea Arcangeli <andrea@suse.de> */
 #include <linux/pagemap.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/ptrace.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
 #include <linux/init.h>
 #include <linux/bootmem.h> /* max_low_pfn */
 #include <linux/vmalloc.h>
 #include <linux/gfp.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
 #include <asm/hwrpb.h>
 #include <asm/dma.h>
 #include <asm/mmu_context.h>
 #include <asm/console.h>
 #include <asm/tlb.h>
 #include <asm/setup.h>
+#include <asm/sections.h>
 extern void die_if_kernel(char *,struct pt_regs *,long);
 static struct pcb_struct original_pcb;
 pgd_t *
 pgd_alloc(struct mm_struct *mm)
 {
 	pgd_t *ret, *init;
 	ret = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 	init = pgd_offset(&init_mm, 0UL);
 	if (ret) {
 #ifdef CONFIG_ALPHA_LARGE_VMALLOC
 		memcpy (ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
 			(PTRS_PER_PGD - USER_PTRS_PER_PGD - 1)*sizeof(pgd_t));
 #else
 		pgd_val(ret[PTRS_PER_PGD-2]) = pgd_val(init[PTRS_PER_PGD-2]);
 #endif
 		/* The last PGD entry is the VPTB self-map.  */
 		pgd_val(ret[PTRS_PER_PGD-1])
 		  = pte_val(mk_pte(virt_to_page(ret), PAGE_KERNEL));
 	}
 	return ret;
 }
 /*
  * BAD_PAGE is the page that is used for page faults when linux
  * is out-of-memory. Older versions of linux just did a
  * do_exit(), but using this instead means there is less risk
  * for a process dying in kernel mode, possibly leaving an inode
  * unused etc..
  *
  * BAD_PAGETABLE is the accompanying page-table: it is initialized
  * to point to BAD_PAGE entries.
  *
  * ZERO_PAGE is a special page that is used for zero-initialized
  * data and COW.
  */
 pmd_t *
 __bad_pagetable(void)
 {
 	memset((void *) EMPTY_PGT, 0, PAGE_SIZE);
 	return (pmd_t *) EMPTY_PGT;
 }
 pte_t
 __bad_page(void)
 {
 	memset((void *) EMPTY_PGE, 0, PAGE_SIZE);
 	return pte_mkdirty(mk_pte(virt_to_page(EMPTY_PGE), PAGE_SHARED));
 }
 static inline unsigned long
 load_PCB(struct pcb_struct *pcb)
 {
 	register unsigned long sp __asm__("$30");
 	pcb->ksp = sp;
 	return __reload_thread(pcb);
 }
 /* Set up initial PCB, VPTB, and other such nicities.  */
 static inline void
 switch_to_system_map(void)
 {
 	unsigned long newptbr;
 	unsigned long original_pcb_ptr;
 	/* Initialize the kernel's page tables.  Linux puts the vptb in
 	   the last slot of the L1 page table.  */
 	memset(swapper_pg_dir, 0, PAGE_SIZE);
 	newptbr = ((unsigned long) swapper_pg_dir - PAGE_OFFSET) >> PAGE_SHIFT;
 	pgd_val(swapper_pg_dir[1023]) =
 		(newptbr << 32) | pgprot_val(PAGE_KERNEL);
 	/* Set the vptb.  This is often done by the bootloader, but
 	   shouldn't be required.  */
 	if (hwrpb->vptb != 0xfffffffe00000000UL) {
 		wrvptptr(0xfffffffe00000000UL);
 		hwrpb->vptb = 0xfffffffe00000000UL;
 		hwrpb_update_checksum(hwrpb);
 	}
 	/* Also set up the real kernel PCB while we're at it.  */
 	init_thread_info.pcb.ptbr = newptbr;
 	init_thread_info.pcb.flags = 1;	/* set FEN, clear everything else */
 	original_pcb_ptr = load_PCB(&init_thread_info.pcb);
 	tbia();
 	/* Save off the contents of the original PCB so that we can
 	   restore the original console's page tables for a clean reboot.
 	   Note that the PCB is supposed to be a physical address, but
 	   since KSEG values also happen to work, folks get confused.
 	   Check this here.  */
 	if (original_pcb_ptr < PAGE_OFFSET) {
 		original_pcb_ptr = (unsigned long)
 			phys_to_virt(original_pcb_ptr);
 	}
 	original_pcb = *(struct pcb_struct *) original_pcb_ptr;
 }
 int callback_init_done;
 void * __init
 callback_init(void * kernel_end)
 {
 	struct crb_struct * crb;
 	pgd_t *pgd;
 	pmd_t *pmd;
 	void *two_pages;
 	/* Starting at the HWRPB, locate the CRB. */
 	crb = (struct crb_struct *)((char *)hwrpb + hwrpb->crb_offset);
 	if (alpha_using_srm) {
 		/* Tell the console whither it is to be remapped. */
 		if (srm_fixup(VMALLOC_START, (unsigned long)hwrpb))
 			__halt();		/* "We're boned."  --Bender */
 		/* Edit the procedure descriptors for DISPATCH and FIXUP. */
 		crb->dispatch_va = (struct procdesc_struct *)
 			(VMALLOC_START + (unsigned long)crb->dispatch_va
 			 - crb->map[0].va);
 		crb->fixup_va = (struct procdesc_struct *)
 			(VMALLOC_START + (unsigned long)crb->fixup_va
 			 - crb->map[0].va);
 	}
 	switch_to_system_map();
 	/* Allocate one PGD and one PMD.  In the case of SRM, we'll need
 	   these to actually remap the console.  There is an assumption
 	   here that only one of each is needed, and this allows for 8MB.
 	   On systems with larger consoles, additional pages will be
 	   allocated as needed during the mapping process.
 	   In the case of not SRM, but not CONFIG_ALPHA_LARGE_VMALLOC,
 	   we need to allocate the PGD we use for vmalloc before we start
 	   forking other tasks.  */
 	two_pages = (void *)
 	  (((unsigned long)kernel_end + ~PAGE_MASK) & PAGE_MASK);
 	kernel_end = two_pages + 2*PAGE_SIZE;
 	memset(two_pages, 0, 2*PAGE_SIZE);
 	pgd = pgd_offset_k(VMALLOC_START);
 	pgd_set(pgd, (pmd_t *)two_pages);
 	pmd = pmd_offset(pgd, VMALLOC_START);
 	pmd_set(pmd, (pte_t *)(two_pages + PAGE_SIZE));
 	if (alpha_using_srm) {
 		static struct vm_struct console_remap_vm;
 		unsigned long nr_pages = 0;
 		unsigned long vaddr;
 		unsigned long i, j;
 		/* calculate needed size */
 		for (i = 0; i < crb->map_entries; ++i)
 			nr_pages += crb->map[i].count;
 		/* register the vm area */
 		console_remap_vm.flags = VM_ALLOC;
 		console_remap_vm.size = nr_pages << PAGE_SHIFT;
 		vm_area_register_early(&console_remap_vm, PAGE_SIZE);
 		vaddr = (unsigned long)console_remap_vm.addr;
 		/* Set up the third level PTEs and update the virtual
 		   addresses of the CRB entries.  */
 		for (i = 0; i < crb->map_entries; ++i) {
 			unsigned long pfn = crb->map[i].pa >> PAGE_SHIFT;
 			crb->map[i].va = vaddr;
 			for (j = 0; j < crb->map[i].count; ++j) {
 				/* Newer consoles (especially on larger
 				   systems) may require more pages of
 				   PTEs. Grab additional pages as needed. */
 				if (pmd != pmd_offset(pgd, vaddr)) {
 					memset(kernel_end, 0, PAGE_SIZE);
 					pmd = pmd_offset(pgd, vaddr);
 					pmd_set(pmd, (pte_t *)kernel_end);
 					kernel_end += PAGE_SIZE;
 				}
 				set_pte(pte_offset_kernel(pmd, vaddr),
 					pfn_pte(pfn, PAGE_KERNEL));
 				pfn++;
 				vaddr += PAGE_SIZE;
 			}
 		}
 	}
 	callback_init_done = 1;
 	return kernel_end;
 }
 #ifndef CONFIG_DISCONTIGMEM
 /*
  * paging_init() sets up the memory map.
  */
 void __init paging_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES] = {0, };
 	unsigned long dma_pfn, high_pfn;
 	dma_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 	high_pfn = max_pfn = max_low_pfn;
 	if (dma_pfn >= high_pfn)
 		zones_size[ZONE_DMA] = high_pfn;
 	else {
 		zones_size[ZONE_DMA] = dma_pfn;
 		zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
 	}
 	/* Initialize mem_map[].  */
 	free_area_init(zones_size);
 	/* Initialize the kernel's ZERO_PGE. */
 	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
 }
 #endif /* CONFIG_DISCONTIGMEM */
 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM)
 void
 srm_paging_stop (void)
 {
 	/* Move the vptb back to where the SRM console expects it.  */
 	swapper_pg_dir[1] = swapper_pg_dir[1023];
 	tbia();
 	wrvptptr(0x200000000UL);
 	hwrpb->vptb = 0x200000000UL;
 	hwrpb_update_checksum(hwrpb);
 	/* Reload the page tables that the console had in use.  */
 	load_PCB(&original_pcb);
 	tbia();
 }
 #endif
 #ifndef CONFIG_DISCONTIGMEM
 static void __init
 printk_memory_info(void)
 {
 	unsigned long codesize, reservedpages, datasize, initsize, tmp;
 	extern int page_is_ram(unsigned long) __init;
-	extern char _text, _etext, _data, _edata;
-	extern char __init_begin, __init_end;
 	/* printk all informations */
 	reservedpages = 0;
 	for (tmp = 0; tmp < max_low_pfn; tmp++)
 		/*
 		 * Only count reserved RAM pages
 		 */
 		if (page_is_ram(tmp) && PageReserved(mem_map+tmp))
 			reservedpages++;
 	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 	datasize =  (unsigned long) &_edata - (unsigned long) &_data;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 	printk("Memory: %luk/%luk available (%luk kernel code, %luk reserved, %luk data, %luk init)\n",
 	       nr_free_pages() << (PAGE_SHIFT-10),
 	       max_mapnr << (PAGE_SHIFT-10),
 	       codesize >> 10,
 	       reservedpages << (PAGE_SHIFT-10),
 	       datasize >> 10,
 	       initsize >> 10);
 }
 void __init
 mem_init(void)
 {
 	max_mapnr = num_physpages = max_low_pfn;
 	totalram_pages += free_all_bootmem();
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 	printk_memory_info();
 }
 #endif /* CONFIG_DISCONTIGMEM */
 void
-free_reserved_mem(void *start, void *end)
-{
-	void *__start = start;
-	for (; __start < end; __start += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(__start));
-		init_page_count(virt_to_page(__start));
-		free_page((long)__start);
-		totalram_pages++;
-	}
-}
-void
 free_initmem(void)
 {
-	extern char __init_begin, __init_end;
+	free_initmem_default(0);
-	free_reserved_mem(&__init_begin, &__init_end);
-	printk ("Freeing unused kernel memory: %ldk freed\n",
-		(&__init_end - &__init_begin) >> 10);
 }
 #ifdef CONFIG_BLK_DEV_INITRD
 void
 free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_mem((void *)start, (void *)end);
+	free_reserved_area(start, end, 0, "initrd");
-	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 }
 #endif

arch/alpha/mm/numa.c

Diff comments View file @ f3beeb4

 /*
  *  linux/arch/alpha/mm/numa.c
  *
  *  DISCONTIGMEM NUMA alpha support.
  *
  *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
  */
 #include <linux/types.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/swap.h>
 #include <linux/initrd.h>
 #include <linux/pfn.h>
 #include <linux/module.h>
 #include <asm/hwrpb.h>
 #include <asm/pgalloc.h>
+#include <asm/sections.h>
 pg_data_t node_data[MAX_NUMNODES];
 EXPORT_SYMBOL(node_data);
 #undef DEBUG_DISCONTIG
 #ifdef DEBUG_DISCONTIG
 #define DBGDCONT(args...) printk(args)
 #else
 #define DBGDCONT(args...)
 #endif
 #define for_each_mem_cluster(memdesc, _cluster, i)		\
 	for ((_cluster) = (memdesc)->cluster, (i) = 0;		\
 	     (i) < (memdesc)->numclusters; (i)++, (_cluster)++)
 static void __init show_mem_layout(void)
 {
 	struct memclust_struct * cluster;
 	struct memdesc_struct * memdesc;
 	int i;
 	/* Find free clusters, and init and free the bootmem accordingly.  */
 	memdesc = (struct memdesc_struct *)
 	  (hwrpb->mddt_offset + (unsigned long) hwrpb);
 	printk("Raw memory layout:\n");
 	for_each_mem_cluster(memdesc, cluster, i) {
 		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
 		       i, cluster->usage, cluster->start_pfn,
 		       cluster->start_pfn + cluster->numpages);
 	}
 }
 static void __init
 setup_memory_node(int nid, void *kernel_end)
 {
 	extern unsigned long mem_size_limit;
 	struct memclust_struct * cluster;
 	struct memdesc_struct * memdesc;
 	unsigned long start_kernel_pfn, end_kernel_pfn;
 	unsigned long bootmap_size, bootmap_pages, bootmap_start;
 	unsigned long start, end;
 	unsigned long node_pfn_start, node_pfn_end;
 	unsigned long node_min_pfn, node_max_pfn;
 	int i;
 	unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
 	int show_init = 0;
 	/* Find the bounds of current node */
 	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
 	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
 	/* Find free clusters, and init and free the bootmem accordingly.  */
 	memdesc = (struct memdesc_struct *)
 	  (hwrpb->mddt_offset + (unsigned long) hwrpb);
 	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
 	node_min_pfn = ~0UL;
 	node_max_pfn = 0UL;
 	for_each_mem_cluster(memdesc, cluster, i) {
 		/* Bit 0 is console/PALcode reserved.  Bit 1 is
 		   non-volatile memory -- we might want to mark
 		   this for later.  */
 		if (cluster->usage & 3)
 			continue;
 		start = cluster->start_pfn;
 		end = start + cluster->numpages;
 		if (start >= node_pfn_end || end <= node_pfn_start)
 			continue;
 		if (!show_init) {
 			show_init = 1;
 			printk("Initializing bootmem allocator on Node ID %d\n", nid);
 		}
 		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
 		       i, cluster->usage, cluster->start_pfn,
 		       cluster->start_pfn + cluster->numpages);
 		if (start < node_pfn_start)
 			start = node_pfn_start;
 		if (end > node_pfn_end)
 			end = node_pfn_end;
 		if (start < node_min_pfn)
 			node_min_pfn = start;
 		if (end > node_max_pfn)
 			node_max_pfn = end;
 	}
 	if (mem_size_limit && node_max_pfn > mem_size_limit) {
 		static int msg_shown = 0;
 		if (!msg_shown) {
 			msg_shown = 1;
 			printk("setup: forcing memory size to %ldK (from %ldK).\n",
 			       mem_size_limit << (PAGE_SHIFT - 10),
 			       node_max_pfn    << (PAGE_SHIFT - 10));
 		}
 		node_max_pfn = mem_size_limit;
 	}
 	if (node_min_pfn >= node_max_pfn)
 		return;
 	/* Update global {min,max}_low_pfn from node information. */
 	if (node_min_pfn < min_low_pfn)
 		min_low_pfn = node_min_pfn;
 	if (node_max_pfn > max_low_pfn)
 		max_pfn = max_low_pfn = node_max_pfn;
 	num_physpages += node_max_pfn - node_min_pfn;
 #if 0 /* we'll try this one again in a little while */
 	/* Cute trick to make sure our local node data is on local memory */
 	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
 #endif
 	/* Quasi-mark the pg_data_t as in-use */
 	node_min_pfn += node_datasz;
 	if (node_min_pfn >= node_max_pfn) {
 		printk(" not enough mem to reserve NODE_DATA");
 		return;
 	}
 	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
 	printk(" Detected node memory:   start %8lu, end %8lu\n",
 	       node_min_pfn, node_max_pfn);
 	DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
 	DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
 	/* Find the bounds of kernel memory.  */
 	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
 	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
 	bootmap_start = -1;
 	if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
 		panic("kernel loaded out of ram");
 	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
 	   Note that we round this down, not up - node memory
 	   has much larger alignment than 8Mb, so it's safe. */
 	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 	/* We need to know how many physically contiguous pages
 	   we'll need for the bootmap.  */
 	bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
 	/* Now find a good region where to allocate the bootmap.  */
 	for_each_mem_cluster(memdesc, cluster, i) {
 		if (cluster->usage & 3)
 			continue;
 		start = cluster->start_pfn;
 		end = start + cluster->numpages;
 		if (start >= node_max_pfn || end <= node_min_pfn)
 			continue;
 		if (end > node_max_pfn)
 			end = node_max_pfn;
 		if (start < node_min_pfn)
 			start = node_min_pfn;
 		if (start < start_kernel_pfn) {
 			if (end > end_kernel_pfn
 			    && end - end_kernel_pfn >= bootmap_pages) {
 				bootmap_start = end_kernel_pfn;
 				break;
 			} else if (end > start_kernel_pfn)
 				end = start_kernel_pfn;
 		} else if (start < end_kernel_pfn)
 			start = end_kernel_pfn;
 		if (end - start >= bootmap_pages) {
 			bootmap_start = start;
 			break;
 		}
 	}
 	if (bootmap_start == -1)
 		panic("couldn't find a contiguous place for the bootmap");
 	/* Allocate the bootmap and mark the whole MM as reserved.  */
 	bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
 					 node_min_pfn, node_max_pfn);
 	DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
 		 bootmap_start, bootmap_size, bootmap_pages);
 	/* Mark the free regions.  */
 	for_each_mem_cluster(memdesc, cluster, i) {
 		if (cluster->usage & 3)
 			continue;
 		start = cluster->start_pfn;
 		end = cluster->start_pfn + cluster->numpages;
 		if (start >= node_max_pfn || end <= node_min_pfn)
 			continue;
 		if (end > node_max_pfn)
 			end = node_max_pfn;
 		if (start < node_min_pfn)
 			start = node_min_pfn;
 		if (start < start_kernel_pfn) {
 			if (end > end_kernel_pfn) {
 				free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
 					     (PFN_PHYS(start_kernel_pfn)
 					      - PFN_PHYS(start)));
 				printk(" freeing pages %ld:%ld\n",
 				       start, start_kernel_pfn);
 				start = end_kernel_pfn;
 			} else if (end > start_kernel_pfn)
 				end = start_kernel_pfn;
 		} else if (start < end_kernel_pfn)
 			start = end_kernel_pfn;
 		if (start >= end)
 			continue;
 		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
 		printk(" freeing pages %ld:%ld\n", start, end);
 	}
 	/* Reserve the bootmap memory.  */
 	reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
 			bootmap_size, BOOTMEM_DEFAULT);
 	printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
 	node_set_online(nid);
 }
 void __init
 setup_memory(void *kernel_end)
 {
 	int nid;
 	show_mem_layout();
 	nodes_clear(node_online_map);
 	min_low_pfn = ~0UL;
 	max_low_pfn = 0UL;
 	for (nid = 0; nid < MAX_NUMNODES; nid++)
 		setup_memory_node(nid, kernel_end);
 #ifdef CONFIG_BLK_DEV_INITRD
 	initrd_start = INITRD_START;
 	if (initrd_start) {
 		extern void *move_initrd(unsigned long);
 		initrd_end = initrd_start+INITRD_SIZE;
 		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
 		       (void *) initrd_start, INITRD_SIZE);
 		if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
 			if (!move_initrd(PFN_PHYS(max_low_pfn)))
 				printk("initrd extends beyond end of memory "
 				       "(0x%08lx > 0x%p)\ndisabling initrd\n",
 				       initrd_end,
 				       phys_to_virt(PFN_PHYS(max_low_pfn)));
 		} else {
 			nid = kvaddr_to_nid(initrd_start);
 			reserve_bootmem_node(NODE_DATA(nid),
 					     virt_to_phys((void *)initrd_start),
 					     INITRD_SIZE, BOOTMEM_DEFAULT);
 		}
 	}
 #endif /* CONFIG_BLK_DEV_INITRD */
 }
 void __init paging_init(void)
 {
 	unsigned int    nid;
 	unsigned long   zones_size[MAX_NR_ZONES] = {0, };
 	unsigned long	dma_local_pfn;
 	/*
 	 * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
 	 * in the NUMA model, for now we convert it to a pfn and
 	 * we interpret this pfn as a local per-node information.
 	 * This issue isn't very important since none of these machines
 	 * have legacy ISA slots anyways.
 	 */
 	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 	for_each_online_node(nid) {
 		bootmem_data_t *bdata = &bootmem_node_data[nid];
 		unsigned long start_pfn = bdata->node_min_pfn;
 		unsigned long end_pfn = bdata->node_low_pfn;
 		if (dma_local_pfn >= end_pfn - start_pfn)
 			zones_size[ZONE_DMA] = end_pfn - start_pfn;
 		else {
 			zones_size[ZONE_DMA] = dma_local_pfn;
 			zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
 		}
 		node_set_state(nid, N_NORMAL_MEMORY);
 		free_area_init_node(nid, zones_size, start_pfn, NULL);
 	}
 	/* Initialize the kernel's ZERO_PGE. */
 	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
 }
 void __init mem_init(void)
 {
 	unsigned long codesize, reservedpages, datasize, initsize, pfn;
 	extern int page_is_ram(unsigned long) __init;
-	extern char _text, _etext, _data, _edata;
-	extern char __init_begin, __init_end;
 	unsigned long nid, i;
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 	reservedpages = 0;
 	for_each_online_node(nid) {
 		/*
 		 * This will free up the bootmem, ie, slot 0 memory
 		 */
 		totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
 		pfn = NODE_DATA(nid)->node_start_pfn;
 		for (i = 0; i < node_spanned_pages(nid); i++, pfn++)
 			if (page_is_ram(pfn) &&
 			    PageReserved(nid_page_nr(nid, i)))
 				reservedpages++;
 	}
 	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 	datasize =  (unsigned long) &_edata - (unsigned long) &_data;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 	printk("Memory: %luk/%luk available (%luk kernel code, %luk reserved, "
 	       "%luk data, %luk init)\n",
 	       nr_free_pages() << (PAGE_SHIFT-10),
 	       num_physpages << (PAGE_SHIFT-10),
 	       codesize >> 10,
 	       reservedpages << (PAGE_SHIFT-10),
 	       datasize >> 10,
 	       initsize >> 10);
 #if 0
 	mem_stress();
 #endif
 }