208d54e551
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>
255 lines
6.6 KiB
C
255 lines
6.6 KiB
C
/*
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* linux/arch/m32r/mm/init.c
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*
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* Copyright (c) 2001, 2002 Hitoshi Yamamoto
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*
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* Some code taken from sh version.
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* Copyright (C) 1999 Niibe Yutaka
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* Based on linux/arch/i386/mm/init.c:
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/swap.h>
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#include <linux/highmem.h>
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#include <linux/bitops.h>
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#include <linux/nodemask.h>
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#include <asm/types.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/setup.h>
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#include <asm/tlb.h>
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/* References to section boundaries */
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extern char _text, _etext, _edata;
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extern char __init_begin, __init_end;
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pgd_t swapper_pg_dir[1024];
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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void show_mem(void)
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{
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int total = 0, reserved = 0;
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int shared = 0, cached = 0;
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int highmem = 0;
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struct page *page;
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pg_data_t *pgdat;
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unsigned long i;
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printk("Mem-info:\n");
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show_free_areas();
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printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
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for_each_pgdat(pgdat) {
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unsigned long flags;
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pgdat_resize_lock(pgdat, &flags);
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for (i = 0; i < pgdat->node_spanned_pages; ++i) {
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page = pgdat_page_nr(pgdat, i);
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total++;
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if (PageHighMem(page))
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highmem++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (page_count(page))
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shared += page_count(page) - 1;
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}
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pgdat_resize_unlock(pgdat, &flags);
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}
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printk("%d pages of RAM\n", total);
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printk("%d pages of HIGHMEM\n",highmem);
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printk("%d reserved pages\n",reserved);
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printk("%d pages shared\n",shared);
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printk("%d pages swap cached\n",cached);
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}
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/*
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* Cache of MMU context last used.
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*/
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#ifndef CONFIG_SMP
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unsigned long mmu_context_cache_dat;
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#else
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unsigned long mmu_context_cache_dat[NR_CPUS];
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#endif
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static unsigned long hole_pages;
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/*
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* function prototype
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*/
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void __init paging_init(void);
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void __init mem_init(void);
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void free_initmem(void);
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long, unsigned long);
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#endif
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/* It'd be good if these lines were in the standard header file. */
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#define START_PFN(nid) \
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(NODE_DATA(nid)->bdata->node_boot_start >> PAGE_SHIFT)
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#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
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#ifndef CONFIG_DISCONTIGMEM
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unsigned long __init zone_sizes_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
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unsigned long max_dma;
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unsigned long low;
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unsigned long start_pfn;
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#ifdef CONFIG_MMU
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start_pfn = START_PFN(0);
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max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
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low = MAX_LOW_PFN(0);
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if (low < max_dma){
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zones_size[ZONE_DMA] = low - start_pfn;
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zones_size[ZONE_NORMAL] = 0;
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} else {
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zones_size[ZONE_DMA] = low - start_pfn;
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zones_size[ZONE_NORMAL] = low - max_dma;
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}
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#else
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zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
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zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
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start_pfn = __MEMORY_START >> PAGE_SHIFT;
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#endif /* CONFIG_MMU */
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free_area_init_node(0, NODE_DATA(0), zones_size, start_pfn, 0);
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return 0;
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}
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#else /* CONFIG_DISCONTIGMEM */
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extern unsigned long zone_sizes_init(void);
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#endif /* CONFIG_DISCONTIGMEM */
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/*======================================================================*
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* paging_init() : sets up the page tables
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*======================================================================*/
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void __init paging_init(void)
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{
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#ifdef CONFIG_MMU
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int i;
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pgd_t *pg_dir;
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/* We don't need kernel mapping as hardware support that. */
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pg_dir = swapper_pg_dir;
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for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
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pgd_val(pg_dir[i]) = 0;
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#endif /* CONFIG_MMU */
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hole_pages = zone_sizes_init();
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}
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int __init reservedpages_count(void)
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{
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int reservedpages, nid, i;
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reservedpages = 0;
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for_each_online_node(nid) {
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unsigned long flags;
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pgdat_resize_lock(NODE_DATA(nid), &flags);
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for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
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if (PageReserved(nid_page_nr(nid, i)))
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reservedpages++;
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pgdat_resize_unlock(NODE_DATA(nid), &flags);
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}
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return reservedpages;
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}
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/*======================================================================*
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* mem_init() :
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* orig : arch/sh/mm/init.c
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*======================================================================*/
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void __init mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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int nid;
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#ifndef CONFIG_MMU
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extern unsigned long memory_end;
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#endif
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num_physpages = 0;
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for_each_online_node(nid)
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num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
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num_physpages -= hole_pages;
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#ifndef CONFIG_DISCONTIGMEM
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max_mapnr = num_physpages;
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#endif /* CONFIG_DISCONTIGMEM */
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#ifdef CONFIG_MMU
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high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
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#else
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high_memory = (void *)(memory_end & PAGE_MASK);
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#endif /* CONFIG_MMU */
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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/* this will put all low memory onto the freelists */
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for_each_online_node(nid)
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totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
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reservedpages = reservedpages_count() - hole_pages;
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codesize = (unsigned long) &_etext - (unsigned long)&_text;
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datasize = (unsigned long) &_edata - (unsigned long)&_etext;
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initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
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printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
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"%dk reserved, %dk data, %dk init)\n",
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(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
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num_physpages << (PAGE_SHIFT-10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT-10),
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datasize >> 10,
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initsize >> 10);
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}
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/*======================================================================*
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* free_initmem() :
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* orig : arch/sh/mm/init.c
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*======================================================================*/
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long)(&__init_begin);
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for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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set_page_count(virt_to_page(addr), 1);
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free_page(addr);
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totalram_pages++;
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}
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printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
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(int)(&__init_end - &__init_begin) >> 10);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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/*======================================================================*
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* free_initrd_mem() :
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* orig : arch/sh/mm/init.c
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*======================================================================*/
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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unsigned long p;
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for (p = start; p < end; p += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(p));
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set_page_count(virt_to_page(p), 1);
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free_page(p);
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totalram_pages++;
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}
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printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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}
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#endif
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