linux-kernel - [PATCH] cgroup/cpuset: remove unneeded nodes_or() in cpuset_change_task

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Date:   Sat, 17 Jun 2023 16:30:43 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <longman@...hat.com>, <tj@...nel.org>, <hannes@...xchg.org>,
        <lizefan.x@...edance.com>
CC:     <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] cgroup/cpuset: remove unneeded nodes_or() in cpuset_change_task_nodemask()

The tsk->mems_allowed is changed before calling mpol_rebind_task() and
being reassigned right after it. But tsk->mems_allowed is not needed
inside mpol_rebind_task(). So remove unneeded tsk->mems_allowed modify
via nodes_or() here.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 kernel/cgroup/cpuset.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 58e6f18f01c1..33a429c1179f 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1941,7 +1941,6 @@ static void cpuset_change_task_nodemask(struct task_struct *tsk,
 	local_irq_disable();
 	write_seqcount_begin(&tsk->mems_allowed_seq);
 
-	nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
 	mpol_rebind_task(tsk, newmems);
 	tsk->mems_allowed = *newmems;
 
-- 
2.27.0