From 0056f4e66a1b8f00245248877e80386af36af14c Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Thu, 31 Oct 2013 16:34:14 -0700 Subject: [PATCH] mm: memcg: lockdep annotation for memcg OOM lock The memcg OOM lock is a mutex-type lock that is open-coded due to memcg's special needs. Add annotations for lockdep coverage. Signed-off-by: Johannes Weiner Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 623d5c8bb1e1..7e11cb7d75b1 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -54,6 +54,7 @@ #include #include #include +#include #include "internal.h" #include #include @@ -2046,6 +2047,12 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg, return total; } +#ifdef CONFIG_LOCKDEP +static struct lockdep_map memcg_oom_lock_dep_map = { + .name = "memcg_oom_lock", +}; +#endif + static DEFINE_SPINLOCK(memcg_oom_lock); /* @@ -2083,7 +2090,8 @@ static bool mem_cgroup_oom_trylock(struct mem_cgroup *memcg) } iter->oom_lock = false; } - } + } else + mutex_acquire(&memcg_oom_lock_dep_map, 0, 1, _RET_IP_); spin_unlock(&memcg_oom_lock); @@ -2095,6 +2103,7 @@ static void mem_cgroup_oom_unlock(struct mem_cgroup *memcg) struct mem_cgroup *iter; spin_lock(&memcg_oom_lock); + mutex_release(&memcg_oom_lock_dep_map, 1, _RET_IP_); for_each_mem_cgroup_tree(iter, memcg) iter->oom_lock = false; spin_unlock(&memcg_oom_lock); -- 2.20.1