From 5c87eada68fe5d29a5f67528f81b6e45124f579b Mon Sep 17 00:00:00 2001
From: Cyrill Gorcunov <gorcunov@openvz.org>
Date: Tue, 16 Jun 2009 15:32:32 -0700
Subject: [PATCH] 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>
---
 mm/page_alloc.c | 5 +++--
 1 file 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;
-- 
2.20.1