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[PATCH] mm: migration page refcounting fix

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Migration code currently does not take a reference to target page
properly, so between unlocking the pte and trying to take a new
reference to the page with isolate_lru_page, anything could happen to
it.

Fix this by holding the pte lock until we get a chance to elevate the
refcount.

Other small cleanups while we're here.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-01-18 17:42:27 -08:00 • committed by Linus Torvalds
parent e236a166b2
commit 053837fce7
7 changed files with 76 additions and 75 deletions
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21
include/linux/mm_inline.h
View file

@ -39,24 +39,3 @@ del_page_from_lru(struct zone *zone, struct page *page)
}
}
/*
* Isolate one page from the LRU lists.
*
* - zone->lru_lock must be held
*/
static inline int __isolate_lru_page(struct page *page)
{
if (unlikely(!TestClearPageLRU(page)))
return 0;
if (get_page_testone(page)) {
/*
* It is being freed elsewhere
*/
__put_page(page);
SetPageLRU(page);
return -ENOENT;
}
return 1;
}