From 38d4ef44ee4a7dbdf220daa52ad341c140f3bb51 Mon Sep 17 00:00:00 2001 From: Waiman Long Date: Fri, 5 Nov 2021 13:37:37 -0700 Subject: [PATCH] mm/memcg: remove obsolete memcg_free_kmem() Since commit d648bcc7fe65 ("mm: kmem: make memcg_kmem_enabled() irreversible"), the only thing memcg_free_kmem() does is to call memcg_offline_kmem() when the memcg is still online which can happen when online_css() fails due to -ENOMEM. However, the name memcg_free_kmem() is confusing and it is more clear and straight forward to call memcg_offline_kmem() directly from mem_cgroup_css_free(). Link: https://lkml.kernel.org/r/20211005202450.11775-1-longman@redhat.com Signed-off-by: Waiman Long Suggested-by: Roman Gushchin Reviewed-by: Aaron Tomlin Reviewed-by: Shakeel Butt Reviewed-by: Roman Gushchin Cc: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Cc: Vlastimil Babka Cc: Muchun Song Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index fd18076..e092cce 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3704,13 +3704,6 @@ static void memcg_offline_kmem(struct mem_cgroup *memcg) memcg_free_cache_id(kmemcg_id); } - -static void memcg_free_kmem(struct mem_cgroup *memcg) -{ - /* css_alloc() failed, offlining didn't happen */ - if (unlikely(memcg->kmem_state == KMEM_ONLINE)) - memcg_offline_kmem(memcg); -} #else static int memcg_online_kmem(struct mem_cgroup *memcg) { @@ -3719,9 +3712,6 @@ static int memcg_online_kmem(struct mem_cgroup *memcg) static void memcg_offline_kmem(struct mem_cgroup *memcg) { } -static void memcg_free_kmem(struct mem_cgroup *memcg) -{ -} #endif /* CONFIG_MEMCG_KMEM */ static int memcg_update_kmem_max(struct mem_cgroup *memcg, @@ -5356,7 +5346,9 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css) cancel_work_sync(&memcg->high_work); mem_cgroup_remove_from_trees(memcg); free_shrinker_info(memcg); - memcg_free_kmem(memcg); + + /* Need to offline kmem if online_css() fails */ + memcg_offline_kmem(memcg); mem_cgroup_free(memcg); } -- 2.7.4