7835e98b2e
set_page_count usage outside mm/ is limited to setting the refcount to 1. Remove set_page_count from outside mm/, and replace those users with init_page_count() and set_page_refcounted(). This allows more debug checking, and tighter control on how code is allowed to play around with page->_count. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/*
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* linux/arch/m68k/mm/init.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* Contains common initialization routines, specific init code moved
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* to motorola.c and sun3mmu.c
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*/
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#include <linux/config.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/system.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#ifdef CONFIG_ATARI
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#include <asm/atari_stram.h>
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#endif
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#include <asm/tlb.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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/*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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*/
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void *empty_zero_page;
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void show_mem(void)
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{
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unsigned long i;
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int free = 0, total = 0, reserved = 0, shared = 0;
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int cached = 0;
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printk("\nMem-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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i = max_mapnr;
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while (i-- > 0) {
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total++;
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if (PageReserved(mem_map+i))
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reserved++;
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else if (PageSwapCache(mem_map+i))
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cached++;
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else if (!page_count(mem_map+i))
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free++;
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else
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shared += page_count(mem_map+i) - 1;
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}
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printk("%d pages of RAM\n",total);
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printk("%d free pages\n",free);
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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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extern void init_pointer_table(unsigned long ptable);
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/* References to section boundaries */
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extern char _text, _etext, _edata, __bss_start, _end;
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extern char __init_begin, __init_end;
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extern pmd_t *zero_pgtable;
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void __init mem_init(void)
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{
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int codepages = 0;
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int datapages = 0;
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int initpages = 0;
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unsigned long tmp;
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#ifndef CONFIG_SUN3
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int i;
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#endif
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max_mapnr = num_physpages = (((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT);
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#ifdef CONFIG_ATARI
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if (MACH_IS_ATARI)
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atari_stram_mem_init_hook();
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#endif
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/* this will put all memory onto the freelists */
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totalram_pages = free_all_bootmem();
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for (tmp = PAGE_OFFSET ; tmp < (unsigned long)high_memory; tmp += PAGE_SIZE) {
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if (PageReserved(virt_to_page(tmp))) {
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if (tmp >= (unsigned long)&_text
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&& tmp < (unsigned long)&_etext)
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codepages++;
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else if (tmp >= (unsigned long) &__init_begin
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&& tmp < (unsigned long) &__init_end)
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initpages++;
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else
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datapages++;
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continue;
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}
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}
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#ifndef CONFIG_SUN3
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/* insert pointer tables allocated so far into the tablelist */
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init_pointer_table((unsigned long)kernel_pg_dir);
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for (i = 0; i < PTRS_PER_PGD; i++) {
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if (pgd_present(kernel_pg_dir[i]))
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init_pointer_table(__pgd_page(kernel_pg_dir[i]));
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}
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/* insert also pointer table that we used to unmap the zero page */
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if (zero_pgtable)
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init_pointer_table((unsigned long)zero_pgtable);
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#endif
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printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
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(unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
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max_mapnr << (PAGE_SHIFT-10),
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codepages << (PAGE_SHIFT-10),
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datapages << (PAGE_SHIFT-10),
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initpages << (PAGE_SHIFT-10));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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int pages = 0;
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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pages++;
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}
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printk ("Freeing initrd memory: %dk freed\n", pages);
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}
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#endif
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