[PATCH] Do not use arbitrary large movablecore to calculate kernelcore

[Zhihui Zhang]

If kernelcore is not set, then we are working with a very large kernelcore
for nothing - no movable zone will be created. If kernelcore is set,
then it is not respected at all.

Signed-off-by: Zhihui Zhang <zzhsuny@xxxxxxxxx>
---
 mm/page_alloc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 40e2942..32bf5da 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5199,7 +5199,11 @@ static void __init find_zone_movable_pfns_for_nodes(void)
 		 */
 		required_movablecore =
 			roundup(required_movablecore, MAX_ORDER_NR_PAGES);
-		corepages = totalpages - required_movablecore;
+
+		if (totalpages > required_movablecore)
+			corepages = totalpages - required_movablecore;
+		else
+			corepages = 0;
 
 		required_kernelcore = max(required_kernelcore, corepages);
 	}
-- 
1.9.1

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