[PATCH] slub: add missing kmem cgroup support to kmem_cache_free_bulk

[Jesper Dangaard Brouer <brouer@redhat.com>]

Initial implementation missed support for kmem cgroup support
in kmem_cache_free_bulk() call, add this.

If CONFIG_MEMCG_KMEM is not enabled, the compiler should
be smart enough to not add any asm code.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
 mm/slub.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/slub.c b/mm/slub.c
index 9be12ffae9fc..9875864ad7b8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2845,6 +2845,9 @@ static int build_detached_freelist(struct kmem_cache *s, size_t size,
 	if (!object)
 		return 0;
 
+	/* Support for kmemcg */
+	s = cache_from_obj(s, object);
+
 	/* Start new detached freelist */
 	set_freepointer(s, object, NULL);
 	df->page = virt_to_head_page(object);

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