1 files changed, 1 insertions, 1 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4f95bcf0f2b1..59153da58c69 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1525,7 +1525,7 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
         long min = mark;
         int o;
 
-        free_pages -= (1 << order) + 1;
+        free_pages -= (1 << order) - 1;
         if (alloc_flags & ALLOC_HIGH)
                 min -= min / 2;
         if (alloc_flags & ALLOC_HARDER)