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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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13
mm/internal.h
View file

@ -13,8 +13,19 @@
#include <linux/mm.h>
static inline void set_page_refs(struct page *page, int order)
static inline void set_page_count(struct page *page, int v)
{
atomic_set(&page->_count, v);
}
/*
* Turn a non-refcounted page (->_count == 0) into refcounted with
* a count of one.
*/
static inline void set_page_refcounted(struct page *page)
{
BUG_ON(PageCompound(page) && page_private(page) != (unsigned long)page);
BUG_ON(atomic_read(&page->_count));
set_page_count(page, 1);
}