mm: make setup_per_zone_inactive_ratio() static

Sparse output following warning.

mm/page_alloc.c:4301:6: warning: symbol 'setup_per_zone_inactive_ratio' was not declared. Should it be static?

cleanup here.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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 6513343..31c5124 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4314,7 +4314,7 @@
  *    1TB     101        10GB
  *   10TB     320        32GB
  */
-void setup_per_zone_inactive_ratio(void)
+static void setup_per_zone_inactive_ratio(void)
 {
 	struct zone *zone;