From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 20 Feb 2013 02:14:02 +0000 (+1100)
Subject: mm/page_alloc.c:__setup_per_zone_wmarks: make min_pages unsigned long
X-Git-Tag: next-20130220~1^2~582
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=51c4ada6d4d92bf72f18a6412e75d58701260455;p=karo-tx-linux.git

mm/page_alloc.c:__setup_per_zone_wmarks: make min_pages unsigned long

`int' is an inappropriate type for a number-of-pages counter.

While we're there, use the clamp() macro.

Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Satoru Moriya <satoru.moriya@hds.com>
Cc: Simon Jeons <simon.jeons@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 9acd27e5dc2b..edb95fc67e70 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5247,13 +5247,10 @@ static void __setup_per_zone_wmarks(void)
 			 * deltas controls asynch page reclaim, and so should
 			 * not be capped for highmem.
 			 */
-			int min_pages;
+			unsigned long min_pages;
 
 			min_pages = zone->present_pages / 1024;
-			if (min_pages < SWAP_CLUSTER_MAX)
-				min_pages = SWAP_CLUSTER_MAX;
-			if (min_pages > 128)
-				min_pages = 128;
+			min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL);
 			zone->watermark[WMARK_MIN] = min_pages;
 		} else {
 			/*