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mm: fix overflow in find_zone_movable_pfns_for_nodes()

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If the user set "movablecore=xx" to a large number, corepages will
overflow.  Fix the problem.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Tang Chen <tangchen@cn.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xishi Qiu 2015-11-05 18:48:11 -08:00 • committed by Linus Torvalds
parent d031a15791
commit 9fd745d450
1 changed files with 1 additions and 0 deletions
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mm/page_alloc.c
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@ -5666,6 +5666,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
*/ */
required_movablecore = required_movablecore =
roundup(required_movablecore, MAX_ORDER_NR_PAGES); roundup(required_movablecore, MAX_ORDER_NR_PAGES);
required_movablecore = min(totalpages, required_movablecore);
corepages = totalpages - required_movablecore; corepages = totalpages - required_movablecore;
required_kernelcore = max(required_kernelcore, corepages); required_kernelcore = max(required_kernelcore, corepages);