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Subject[PATCH] mm: fix overflow in find_zone_movable_pfns_for_nodes()
If user set "movablecore=xx" to a large number, corepages will overflow,
this patch fix the problem.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
mm/page_alloc.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 48aaf7b..af3c9bd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5668,6 +5668,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
*/
required_movablecore =
roundup(required_movablecore, MAX_ORDER_NR_PAGES);
+ required_movablecore = min(totalpages, required_movablecore);
corepages = totalpages - required_movablecore;

required_kernelcore = max(required_kernelcore, corepages);
--
2.0.0



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