mm: setup_per_zone_inactive_ratio - do not call for int_sqrt if not needed

int_sqrt() returns 0 if its argument is zero so call it if only needed.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e5b8f628d166..db8c46ffa9f5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4471,8 +4471,9 @@ static void setup_per_zone_inactive_ratio(void)
 
                 /* Zone size in gigabytes */
                 gb = zone->present_pages >> (30 - PAGE_SHIFT);
-                ratio = int_sqrt(10 * gb);
-                if (!ratio)
+                if (gb)
+                        ratio = int_sqrt(10 * gb);
+                else
                         ratio = 1;
 
                 zone->inactive_ratio = ratio;