Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a32d83c..09255ec 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3012,7 +3012,8 @@ int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
        return 0;
 }
 
-int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s)
+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);
 
@@ -3026,8 +3027,10 @@ int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s)
        if (!s->memcg_params)
                return -ENOMEM;
 
-       if (memcg)
+       if (memcg) {
                s->memcg_params->memcg = memcg;
+               s->memcg_params->root_cache = root_cache;
+       }
        return 0;
 }
 
@@ -3186,7 +3189,7 @@ static struct kmem_cache *kmem_cache_dup(struct mem_cgroup *memcg,
                return NULL;
 
        new = kmem_cache_create_memcg(memcg, name, s->object_size, s->align,
-                                     (s->flags & ~SLAB_PANIC), s->ctor);
+                                     (s->flags & ~SLAB_PANIC), s->ctor, s);
 
        if (new)
                new->allocflags |= __GFP_KMEMCG;
@@ -3226,7 +3229,6 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
        }
 
        mem_cgroup_get(memcg);
-       new_cachep->memcg_params->root_cache = cachep;
        atomic_set(&new_cachep->memcg_params->nr_pages , 0);
 
        cachep->memcg_params->memcg_caches[idx] = new_cachep;
@@ -6088,7 +6090,6 @@ mem_cgroup_css_alloc(struct cgroup *cont)
                                                &per_cpu(memcg_stock, cpu);
                        INIT_WORK(&stock->work, drain_local_stock);
                }
-               hotcpu_notifier(memcg_cpu_hotplug_callback, 0);
        } else {
                parent = mem_cgroup_from_cont(cont->parent);
                memcg->use_hierarchy = parent->use_hierarchy;
@@ -6754,6 +6755,19 @@ struct cgroup_subsys mem_cgroup_subsys = {
        .use_id = 1,
 };
 
+/*
+ * The rest of init is performed during ->css_alloc() for root css which
+ * happens before initcalls.  hotcpu_notifier() can't be done together as
+ * it would introduce circular locking by adding cgroup_lock -> cpu hotplug
+ * dependency.  Do it from a subsys_initcall().
+ */
+static int __init mem_cgroup_init(void)
+{
+       hotcpu_notifier(memcg_cpu_hotplug_callback, 0);
+       return 0;
+}
+subsys_initcall(mem_cgroup_init);
+
 #ifdef CONFIG_MEMCG_SWAP
 static int __init enable_swap_account(char *s)
 {