slab: factor out initialization of array cache

Factor out initialization of array cache to use it in following patch.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slab.c b/mm/slab.c
index f6ad8d3..8d9a0ff 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -791,13 +791,8 @@ static void start_cpu_timer(int cpu)
        }
 }
 
-static struct array_cache *alloc_arraycache(int node, int entries,
-                                           int batchcount, gfp_t gfp)
+static void init_arraycache(struct array_cache *ac, int limit, int batch)
 {
-       int memsize = sizeof(void *) * entries + sizeof(struct array_cache);
-       struct array_cache *nc = NULL;
-
-       nc = kmalloc_node(memsize, gfp, node);
        /*
         * The array_cache structures contain pointers to free object.
         * However, when such objects are allocated or transferred to another
@@ -805,15 +800,25 @@ static struct array_cache *alloc_arraycache(int node, int entries,
         * valid references during a kmemleak scan. Therefore, kmemleak must
         * not scan such objects.
         */
-       kmemleak_no_scan(nc);
-       if (nc) {
-               nc->avail = 0;
-               nc->limit = entries;
-               nc->batchcount = batchcount;
-               nc->touched = 0;
-               spin_lock_init(&nc->lock);
+       kmemleak_no_scan(ac);
+       if (ac) {
+               ac->avail = 0;
+               ac->limit = limit;
+               ac->batchcount = batch;
+               ac->touched = 0;
+               spin_lock_init(&ac->lock);
        }
-       return nc;
+}
+
+static struct array_cache *alloc_arraycache(int node, int entries,
+                                           int batchcount, gfp_t gfp)
+{
+       int memsize = sizeof(void *) * entries + sizeof(struct array_cache);
+       struct array_cache *ac = NULL;
+
+       ac = kmalloc_node(memsize, gfp, node);
+       init_arraycache(ac, entries, batchcount);
+       return ac;
 }
 
 static inline bool is_slab_pfmemalloc(struct page *page)