memcg: do not call reclaim if !__GFP_WAIT

When trimming memcg consumption excess (see memory.high), we call
try_to_free_mem_cgroup_pages without checking if we are allowed to sleep
in the current context, which can result in a deadlock.  Fix this.

Fixes: 241994ed8649 ("mm: memcontrol: default hierarchy interface for memory")
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 14c2f2017e37..9da23a7ec4c0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2323,6 +2323,8 @@ done_restock:
         css_get_many(&memcg->css, batch);
         if (batch > nr_pages)
                 refill_stock(memcg, batch - nr_pages);
+        if (!(gfp_mask & __GFP_WAIT))
+                goto done;
         /*
          * If the hierarchy is above the normal consumption range,
          * make the charging task trim their excess contribution.