kmemcg: don't allocate extra memory for root memcg_cache_params

[cascardo/linux.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3b83957..5ca1dcf 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3121,7 +3121,7 @@ int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
                ssize_t size = memcg_caches_array_size(num_groups);
 
                size *= sizeof(void *);
-               size += sizeof(struct memcg_cache_params);
+               size += offsetof(struct memcg_cache_params, memcg_caches);
 
                s->memcg_params = kzalloc(size, GFP_KERNEL);
                if (!s->memcg_params) {
@@ -3164,13 +3164,16 @@ int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
 int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
                         struct kmem_cache *root_cache)
 {
-       size_t size = sizeof(struct memcg_cache_params);
+       size_t size;
 
        if (!memcg_kmem_enabled())
                return 0;
 
-       if (!memcg)
+       if (!memcg) {
+               size = offsetof(struct memcg_cache_params, memcg_caches);
                size += memcg_limited_groups_array_size * sizeof(void *);
+       } else
+               size = sizeof(struct memcg_cache_params);
 
        s->memcg_params = kzalloc(size, GFP_KERNEL);
        if (!s->memcg_params)