linux-kernel - [PATCH v2] mm: memcontrol: remove obsolete comment of mem_cgroup_unmark_under

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Date:   Thu, 17 Sep 2020 06:59:00 -0400
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <hannes@...xchg.org>, <mhocko@...nel.org>,
        <vdavydov.dev@...il.com>, <akpm@...ux-foundation.org>
CC:     <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2] mm: memcontrol: remove obsolete comment of mem_cgroup_unmark_under_oom()

Since commit 79dfdaccd1d5 ("memcg: make oom_lock 0 and 1 based rather than
counter"), the mem_cgroup_unmark_under_oom() is added and the comment of
the mem_cgroup_oom_unlock() is moved here. But this comment make no sense
here because mem_cgroup_oom_lock() does not operate on under_oom field.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/memcontrol.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cd5f83de9a6f..e44f5afaf78b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1848,10 +1848,6 @@ static void mem_cgroup_unmark_under_oom(struct mem_cgroup *memcg)
 {
 	struct mem_cgroup *iter;
 
-	/*
-	 * When a new child is created while the hierarchy is under oom,
-	 * mem_cgroup_oom_lock() may not be called. Watch for underflow.
-	 */
 	spin_lock(&memcg_oom_lock);
 	for_each_mem_cgroup_tree(iter, memcg)
 		if (iter->under_oom > 0)
-- 
2.19.1