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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 5 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 804cc62ab72f..703944809666 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 {
                         /*