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[PATCH] remove set_page_count() outside mm/

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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>
This commit is contained in:
Nick Piggin 2006-03-22 00:08:40 -08:00 • committed by Linus Torvalds
parent 70dc991d66
commit 7835e98b2e
40 changed files with 96 additions and 79 deletions
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14
mm/page_alloc.c
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@ -442,7 +442,7 @@ void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order)
if (order == 0) {
__ClearPageReserved(page);
set_page_count(page, 0);
set_page_refs(page, 0);
set_page_refcounted(page);
__free_page(page);
} else {
int loop;
@ -457,7 +457,7 @@ void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order)
set_page_count(p, 0);
}
set_page_refs(page, order);
set_page_refcounted(page);
__free_pages(page, order);
}
}
@ -525,7 +525,7 @@ static int prep_new_page(struct page *page, int order)
1 << PG_referenced | 1 << PG_arch_1 |
1 << PG_checked | 1 << PG_mappedtodisk);
set_page_private(page, 0);
set_page_refs(page, order);
set_page_refcounted(page);
kernel_map_pages(page, 1 << order, 1);
return 0;
}
@ -755,10 +755,8 @@ void split_page(struct page *page, unsigned int order)
BUG_ON(PageCompound(page));
BUG_ON(!page_count(page));
for (i = 1; i < (1 << order); i++) {
BUG_ON(page_count(page + i));
set_page_count(page + i, 1);
}
for (i = 1; i < (1 << order); i++)
set_page_refcounted(page + i);
}
/*
@ -1771,7 +1769,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
continue;
page = pfn_to_page(pfn);
set_page_links(page, zone, nid, pfn);
set_page_count(page, 1);
init_page_count(page);
reset_page_mapcount(page);
SetPageReserved(page);
INIT_LIST_HEAD(&page->lru);