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memory unplug: isolate_lru_page fix

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release_pages() in mm/swap.c changes page_count() to be 0 without removing
PageLRU flag...

This means isolate_lru_page() can see a page, PageLRU() &&
page_count(page)==0..  This is BUG.  (get_page() will be called against
count=0 page.)

Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KAMEZAWA Hiroyuki 2007-07-26 10:41:08 -07:00 • committed by Linus Torvalds
commit 3dd9fe8c39
1 changed files with 1 additions and 2 deletions
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3
mm/migrate.c
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@ -49,9 +49,8 @@ int isolate_lru_page(struct page *page, struct list_head *pagelist)
struct zone *zone = page_zone(page);
spin_lock_irq(&zone->lru_lock);
if (PageLRU(page)) {
if (PageLRU(page) && get_page_unless_zero(page)) {
ret = 0;
get_page(page);
ClearPageLRU(page);
if (PageActive(page))
del_page_from_active_list(zone, page);