[PATCH -mmotm] mm: setup_per_zone_inactive_ratio - do not call forint_sqrt if not needed

[Cyrill Gorcunov]

int_sqrt returns 0 iif argument is zero so call it if only needed.

Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
---
 mm/page_alloc.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6.git/mm/page_alloc.c
=====================================================================
--- linux-2.6.git.orig/mm/page_alloc.c
+++ linux-2.6.git/mm/page_alloc.c
@@ -4553,8 +4553,9 @@ static void setup_per_zone_inactive_rati
 
 		/* 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;
--
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