3 files changed, 18 insertions, 30 deletions

diff --git a/mm/slab.h b/mm/slab.h
index 8184a7cde272..3045316b7c9d 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -55,12 +55,12 @@ extern void create_boot_cache(struct kmem_cache *, const char *name,
 struct mem_cgroup;
 #ifdef CONFIG_SLUB
 struct kmem_cache *
-__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
-                   size_t align, unsigned long flags, void (*ctor)(void *));
+__kmem_cache_alias(const char *name, size_t size, size_t align,
+                   unsigned long flags, void (*ctor)(void *));
 #else
 static inline struct kmem_cache *
-__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
-                   size_t align, unsigned long flags, void (*ctor)(void *))
+__kmem_cache_alias(const char *name, size_t size, size_t align,
+                   unsigned long flags, void (*ctor)(void *))
 { return NULL; }
 #endif
 
@@ -119,13 +119,6 @@ static inline bool is_root_cache(struct kmem_cache *s)
         return !s->memcg_params || s->memcg_params->is_root_cache;
 }
 
-static inline bool cache_match_memcg(struct kmem_cache *cachep,
-                                     struct mem_cgroup *memcg)
-{
-        return (is_root_cache(cachep) && !memcg) ||
-                                (cachep->memcg_params->memcg == memcg);
-}
-
 static inline void memcg_bind_pages(struct kmem_cache *s, int order)
 {
         if (!is_root_cache(s))
@@ -204,12 +197,6 @@ static inline bool is_root_cache(struct kmem_cache *s)
         return true;
 }
 
-static inline bool cache_match_memcg(struct kmem_cache *cachep,
-                                     struct mem_cgroup *memcg)
-{
-        return true;
-}
-
 static inline void memcg_bind_pages(struct kmem_cache *s, int order)
 {
 }
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 1ec3c619ba04..e77b51eb7347 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -200,9 +200,11 @@ kmem_cache_create_memcg(struct mem_cgroup *memcg, const char *name, size_t size,
          */
         flags &= CACHE_CREATE_MASK;
 
-        s = __kmem_cache_alias(memcg, name, size, align, flags, ctor);
-        if (s)
-                goto out_unlock;
+        if (!memcg) {
+                s = __kmem_cache_alias(name, size, align, flags, ctor);
+                if (s)
+                        goto out_unlock;
+        }
 
         err = -ENOMEM;
         s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
diff --git a/mm/slub.c b/mm/slub.c
index 5b05e4fe9a1a..7d81afb27048 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3685,6 +3685,9 @@ static int slab_unmergeable(struct kmem_cache *s)
         if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE))
                 return 1;
 
+        if (!is_root_cache(s))
+                return 1;
+
         if (s->ctor)
                 return 1;
 
@@ -3697,9 +3700,8 @@ static int slab_unmergeable(struct kmem_cache *s)
         return 0;
 }
 
-static struct kmem_cache *find_mergeable(struct mem_cgroup *memcg, size_t size,
-                size_t align, unsigned long flags, const char *name,
-                void (*ctor)(void *))
+static struct kmem_cache *find_mergeable(size_t size, size_t align,
+                unsigned long flags, const char *name, void (*ctor)(void *))
 {
         struct kmem_cache *s;
 
@@ -3722,7 +3724,7 @@ static struct kmem_cache *find_mergeable(struct mem_cgroup *memcg, size_t size,
                         continue;
 
                 if ((flags & SLUB_MERGE_SAME) != (s->flags & SLUB_MERGE_SAME))
-                                continue;
+                        continue;
                 /*
                  * Check if alignment is compatible.
                  * Courtesy of Adrian Drzewiecki
@@ -3733,21 +3735,18 @@ static struct kmem_cache *find_mergeable(struct mem_cgroup *memcg, size_t size,
                 if (s->size - size >= sizeof(void *))
                         continue;
 
-                if (!cache_match_memcg(s, memcg))
-                        continue;
-
                 return s;
         }
         return NULL;
 }
 
 struct kmem_cache *
-__kmem_cache_alias(struct mem_cgroup *memcg, const char *name, size_t size,
-                   size_t align, unsigned long flags, void (*ctor)(void *))
+__kmem_cache_alias(const char *name, size_t size, size_t align,
+                   unsigned long flags, void (*ctor)(void *))
 {
         struct kmem_cache *s;
 
-        s = find_mergeable(memcg, size, align, flags, name, ctor);
+        s = find_mergeable(size, align, flags, name, ctor);
         if (s) {
                 s->refcount++;
                 /*