memcg is NULL if we have CONFIG_MEMCG set, but cgroup_disable=memory on
the kernel command line.
Fixes: 8a907cdf0177ab40 ("mm, memcg: proportional memory.{low,min} reclaim")
Reported-by: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Signed-off-by: Chris Down <ch...@chrisdown.name>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Johannes Weiner <han...@cmpxchg.org>
Cc: Tejun Heo <t...@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: cgro...@vger.kernel.org
Cc: linux...@kvack.org
---
include/linux/memcontrol.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 290cfbfd60cd..49742489aa56 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -335,6 +335,9 @@ static inline bool mem_cgroup_disabled(void)
static inline unsigned long mem_cgroup_protection(struct mem_cgroup *memcg)
{
+ if (mem_cgroup_disabled())
+ return 0;
+
return max(READ_ONCE(memcg->memory.emin),
READ_ONCE(memcg->memory.elow));
}
--
2.20.1
