From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Date: Mon, 22 Jun 2009 23:57:55 +0000 (+0900)
Subject: mm: fix incorrect page removal from LRU
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cb4cbcf6b3cf79f80c157afdc8dd8221643d8481;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

mm: fix incorrect page removal from LRU

The isolated page is "cursor_page" not "page".

This could cause LRU list corruption under memory pressure, caught by
CONFIG_DEBUG_LIST.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Tested-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e8fa2d9eb212..54155268dfca 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -932,7 +932,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 				continue;
 			if (__isolate_lru_page(cursor_page, mode, file) == 0) {
 				list_move(&cursor_page->lru, dst);
-				mem_cgroup_del_lru(page);
+				mem_cgroup_del_lru(cursor_page);
 				nr_taken++;
 				scan++;
 			}