linux-kernel - [PATCH 5.4 09/10] cpuset: Fix the bug that subpart_cpus updated wrongly in update

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Message-Id: <20220204091912.624395230@linuxfoundation.org>
Date:   Fri,  4 Feb 2022 10:20:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tianchen Ding <dtcccc@...ux.alibaba.com>,
        Waiman Long <longman@...hat.com>, Tejun Heo <tj@...nel.org>
Subject: [PATCH 5.4 09/10] cpuset: Fix the bug that subpart_cpus updated wrongly in update_cpumask()

From: Tianchen Ding <dtcccc@...ux.alibaba.com>

commit c80d401c52a2d1baf2a5afeb06f0ffe678e56d23 upstream.

subparts_cpus should be limited as a subset of cpus_allowed, but it is
updated wrongly by using cpumask_andnot(). Use cpumask_and() instead to
fix it.

Fixes: ee8dde0cd2ce ("cpuset: Add new v2 cpuset.sched.partition flag")
Signed-off-by: Tianchen Ding <dtcccc@...ux.alibaba.com>
Reviewed-by: Waiman Long <longman@...hat.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/cgroup/cpuset.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1558,8 +1558,7 @@ static int update_cpumask(struct cpuset
 	 * Make sure that subparts_cpus is a subset of cpus_allowed.
 	 */
 	if (cs->nr_subparts_cpus) {
-		cpumask_andnot(cs->subparts_cpus, cs->subparts_cpus,
-			       cs->cpus_allowed);
+		cpumask_and(cs->subparts_cpus, cs->subparts_cpus, cs->cpus_allowed);
 		cs->nr_subparts_cpus = cpumask_weight(cs->subparts_cpus);
 	}
 	spin_unlock_irq(&callback_lock);