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>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e5b8f628d1666e2eacd8b18687682260041ec1e2..db8c46ffa9f57c1504647419db31da102aea401d 100644 (file)
--- 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;