[PATCH V2 2/2] 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>

---
V2: Fixes according to input from:
 Vladimir Davydov <vdavydov@virtuozzo.com>
 and Joonsoo Kim <iamjoonsoo.kim@lge.com>

 mm/slub.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/slub.c b/mm/slub.c
index 8e9e9b2ee6f3..bc64514ad1bb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2890,6 +2890,9 @@ void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
 	do {
 		struct detached_freelist df;
 
+		/* Support for memcg */
+		s = cache_from_obj(s, p[size - 1]);
+
 		size = build_detached_freelist(s, size, p, &df);
 		if (unlikely(!df.page))
 			continue;

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