vmscan: change shrink_slab() interfaces by passing shrink_control

Consolidate the existing parameters to shrink_slab() into a new
shrink_control struct.  This is needed later to pass the same struct to
shrinkers.

Signed-off-by: Ying Han <yinghan@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 98b77c89494c..440999c24353 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -40,9 +40,13 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
 static void drop_slab(void)
 {
         int nr_objects;
+        struct shrink_control shrink = {
+                .gfp_mask = GFP_KERNEL,
+                .nr_scanned = 1000,
+        };
 
         do {
-                nr_objects = shrink_slab(1000, GFP_KERNEL, 1000);
+                nr_objects = shrink_slab(&shrink, 1000);
         } while (nr_objects > 10);
 }