mm/slub: reset cpu_slab's pointer in deactivate_slab()

Each time a slab is deactivated, the page and freelist pointer should be
reset.

This patch just merges these two options into deactivate_slab().

Link: http://lkml.kernel.org/r/20170507031215.3130-2-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slub.c b/mm/slub.c
index b6b637503d7765800799b7d2a715ec034f29359c..7234e0e03bdc67ee712a43ac14bfeae4cc50e868 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1993,7 +1993,7 @@ static void init_kmem_cache_cpus(struct kmem_cache *s)
  * Remove the cpu slab
  */
 static void deactivate_slab(struct kmem_cache *s, struct page *page,
-                               void *freelist)
+                               void *freelist, struct kmem_cache_cpu *c)
 {
        enum slab_modes { M_NONE, M_PARTIAL, M_FULL, M_FREE };
        struct kmem_cache_node *n = get_node(s, page_to_nid(page));
@@ -2132,6 +2132,9 @@ redo:
                discard_slab(s, page);
                stat(s, FREE_SLAB);
        }
+
+       c->page = NULL;
+       c->freelist = NULL;
 }
 
 /*
@@ -2266,11 +2269,9 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
 static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
 {
        stat(s, CPUSLAB_FLUSH);
-       deactivate_slab(s, c->page, c->freelist);
+       deactivate_slab(s, c->page, c->freelist, c);
 
        c->tid = next_tid(c->tid);
-       c->page = NULL;
-       c->freelist = NULL;
 }
 
 /*
@@ -2521,9 +2522,7 @@ redo:
 
                if (unlikely(!node_match(page, searchnode))) {
                        stat(s, ALLOC_NODE_MISMATCH);
-                       deactivate_slab(s, page, c->freelist);
-                       c->page = NULL;
-                       c->freelist = NULL;
+                       deactivate_slab(s, page, c->freelist, c);
                        goto new_slab;
                }
        }
@@ -2534,9 +2533,7 @@ redo:
         * information when the page leaves the per-cpu allocator
         */
        if (unlikely(!pfmemalloc_match(page, gfpflags))) {
-               deactivate_slab(s, page, c->freelist);
-               c->page = NULL;
-               c->freelist = NULL;
+               deactivate_slab(s, page, c->freelist, c);
                goto new_slab;
        }
 
@@ -2591,9 +2588,7 @@ new_slab:
                        !alloc_debug_processing(s, page, freelist, addr))
                goto new_slab;  /* Slab failed checks. Next slab needed */
 
-       deactivate_slab(s, page, get_freepointer(s, freelist));
-       c->page = NULL;
-       c->freelist = NULL;
+       deactivate_slab(s, page, get_freepointer(s, freelist), c);
        return freelist;
 }