[PATCH V3 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.

Incomming bulk free objects can belong to different kmem cgroups, and
object free call can happen at a later point outside memcg context.
Thus, we need to keep the orig kmem_cache, to correctly verify if a
memcg object match against its "root_cache" (s->memcg_params.root_cache).

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

---
V3:
 Learned more about memcg, actually tested it and fixed a bug

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

 mm/slub.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index 8e6b929d06d6..e3fa85278706 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2889,13 +2889,17 @@ static int build_detached_freelist(struct kmem_cache *s, size_t size,
 
 
 /* Note that interrupts must be enabled when calling this function. */
-void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
+void kmem_cache_free_bulk(struct kmem_cache *orig_s, size_t size, void **p)
 {
 	if (WARN_ON(!size))
 		return;
 
 	do {
 		struct detached_freelist df;
+		struct kmem_cache *s;
+
+		/* Support for memcg */
+		s = cache_from_obj(orig_s, p[size - 1]);
 
 		size = build_detached_freelist(s, size, p, &df);
 		if (unlikely(!df.page))

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