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linux-next/arch/m32r/mm/init.c
Dave Hansen 208d54e551 [PATCH] memory hotplug locking: node_size_lock 
pgdat->node_size_lock is basically only neeeded in one place in the normal
code: show_mem(), which is the arch-specific sysrq-m printing function.

Strictly speaking, the architectures not doing memory hotplug do no need this
locking in show_mem().  However, they are all included for completeness.  This
should also make any future consolidation of all of the implementations a
little more straightforward.

This lock is also held in the sparsemem code during a memory removal, as
sections are invalidated.  This is the place there pfn_valid() is made false
for a memory area that's being removed.  The lock is only required when doing
pfn_valid() operations on memory which the user does not already have a
reference on the page, such as in show_mem().

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:44 -07:00

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/*
* linux/arch/m32r/mm/init.c
*
* Copyright (c) 2001, 2002 Hitoshi Yamamoto
*
* Some code taken from sh version.
* Copyright (C) 1999 Niibe Yutaka
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/swap.h>
#include <linux/highmem.h>
#include <linux/bitops.h>
#include <linux/nodemask.h>
#include <asm/types.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/tlb.h>
/* References to section boundaries */
extern char _text, _etext, _edata;
extern char __init_begin, __init_end;
pgd_t swapper_pg_dir[1024];
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
void show_mem(void)
{
int total = 0, reserved = 0;
int shared = 0, cached = 0;
int highmem = 0;
struct page *page;
pg_data_t *pgdat;
unsigned long i;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
for_each_pgdat(pgdat) {
unsigned long flags;
pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; ++i) {
page = pgdat_page_nr(pgdat, i);
total++;
if (PageHighMem(page))
highmem++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (page_count(page))
shared += page_count(page) - 1;
}
pgdat_resize_unlock(pgdat, &flags);
}
printk("%d pages of RAM\n", total);
printk("%d pages of HIGHMEM\n",highmem);
printk("%d reserved pages\n",reserved);
printk("%d pages shared\n",shared);
printk("%d pages swap cached\n",cached);
}
/*
* Cache of MMU context last used.
*/
#ifndef CONFIG_SMP
unsigned long mmu_context_cache_dat;
#else
unsigned long mmu_context_cache_dat[NR_CPUS];
#endif
static unsigned long hole_pages;
/*
* function prototype
*/
void __init paging_init(void);
void __init mem_init(void);
void free_initmem(void);
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long, unsigned long);
#endif
/* It'd be good if these lines were in the standard header file. */
#define START_PFN(nid) \
(NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
#ifndef CONFIG_DISCONTIGMEM
unsigned long __init zone_sizes_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
unsigned long max_dma;
unsigned long low;
unsigned long start_pfn;
#ifdef CONFIG_MMU
start_pfn = START_PFN(0);
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
low = MAX_LOW_PFN(0);
if (low < max_dma){
zones_size[ZONE_DMA] = low - start_pfn;
zones_size[ZONE_NORMAL] = 0;
} else {
zones_size[ZONE_DMA] = low - start_pfn;
zones_size[ZONE_NORMAL] = low - max_dma;
}
#else
zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
start_pfn = __MEMORY_START >> PAGE_SHIFT;
#endif /* CONFIG_MMU */
free_area_init_node(0, NODE_DATA(0), zones_size, start_pfn, 0);
return 0;
}
#else /* CONFIG_DISCONTIGMEM */
extern unsigned long zone_sizes_init(void);
#endif /* CONFIG_DISCONTIGMEM */
/*======================================================================*
* paging_init() : sets up the page tables
*======================================================================*/
void __init paging_init(void)
{
#ifdef CONFIG_MMU
int i;
pgd_t *pg_dir;
/* We don't need kernel mapping as hardware support that. */
pg_dir = swapper_pg_dir;
for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
pgd_val(pg_dir[i]) = 0;
#endif /* CONFIG_MMU */
hole_pages = zone_sizes_init();
}
int __init reservedpages_count(void)
{
int reservedpages, nid, i;
reservedpages = 0;
for_each_online_node(nid) {
unsigned long flags;
pgdat_resize_lock(NODE_DATA(nid), &flags);
for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
if (PageReserved(nid_page_nr(nid, i)))
reservedpages++;
pgdat_resize_unlock(NODE_DATA(nid), &flags);
}
return reservedpages;
}
/*======================================================================*
* mem_init() :
* orig : arch/sh/mm/init.c
*======================================================================*/
void __init mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
int nid;
#ifndef CONFIG_MMU
extern unsigned long memory_end;
#endif
num_physpages = 0;
for_each_online_node(nid)
num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
num_physpages -= hole_pages;
#ifndef CONFIG_DISCONTIGMEM
max_mapnr = num_physpages;
#endif /* CONFIG_DISCONTIGMEM */
#ifdef CONFIG_MMU
high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
#else
high_memory = (void *)(memory_end & PAGE_MASK);
#endif /* CONFIG_MMU */
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
/* this will put all low memory onto the freelists */
for_each_online_node(nid)
totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
reservedpages = reservedpages_count() - hole_pages;
codesize = (unsigned long) &_etext - (unsigned long)&_text;
datasize = (unsigned long) &_edata - (unsigned long)&_etext;
initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk reserved, %dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10);
}
/*======================================================================*
* free_initmem() :
* orig : arch/sh/mm/init.c
*======================================================================*/
void free_initmem(void)
{
unsigned long addr;
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
set_page_count(virt_to_page(addr), 1);
free_page(addr);
totalram_pages++;
}
printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
(int)(&__init_end - &__init_begin) >> 10);
}
#ifdef CONFIG_BLK_DEV_INITRD
/*======================================================================*
* free_initrd_mem() :
* orig : arch/sh/mm/init.c
*======================================================================*/
void free_initrd_mem(unsigned long start, unsigned long end)
{
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
set_page_count(virt_to_page(p), 1);
free_page(p);
totalram_pages++;
}
printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
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