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mem-hotplug: call isolate_lru_page with elevated refcount 

isolate_lru_page() must be called only with stable reference to page.  So,
let's grab normal page reference.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2011-05-24 17:12:19 -07:00 committed by Linus Torvalds
parent 22943ab116
commit 700c2a46e8
1 changed files with 3 additions and 1 deletions
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4
mm/memory_hotplug.c
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@ -706,7 +706,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
if (!pfn_valid(pfn))
continue;
page = pfn_to_page(pfn);
if (!page_count(page))
if (!get_page_unless_zero(page))
continue;
/*
* We can skip free pages. And we can only deal with pages on
@ -714,6 +714,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
*/
ret = isolate_lru_page(page);
if (!ret) { /* Success */
put_page(page);
list_add_tail(&page->lru, &source);
move_pages--;
inc_zone_page_state(page, NR_ISOLATED_ANON +
@ -725,6 +726,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
pfn);
dump_page(page);
#endif
put_page(page);
/* Because we don't have big zone->lock. we should
check this again here. */
if (page_count(page)) {