From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
Scott Wood <swood@redhat.com>
Subject: [PATCH] sched: __set_cpus_allowed_ptr(): Check cpus_mask, not cpus_ptr
Date: Wed, 17 Jun 2020 14:17:42 +0200
Message-ID: <20200617121742.cpxppyi7twxmpin7@linutronix.de> (raw)
From: Scott Wood <swood@redhat.com>
This function is concerned with the long-term cpu mask, not the
transitory mask the task might have while migrate disabled. Before
this patch, if a task was migrate disabled at the time
__set_cpus_allowed_ptr() was called, and the new mask happened to be
equal to the cpu that the task was running on, then the mask update
would be lost.
Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
kernel/sched/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1637,7 +1637,7 @@ static int __set_cpus_allowed_ptr(struct
goto out;
}
- if (cpumask_equal(p->cpus_ptr, new_mask))
+ if (cpumask_equal(&p->cpus_mask, new_mask))
goto out;
/*
next reply index
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 12:17 Sebastian Andrzej Siewior [this message]
2020-06-17 14:15 ` Valentin Schneider
2020-06-17 22:49 ` Scott Wood
2020-06-18 8:07 ` Sebastian Andrzej Siewior
2020-06-18 8:51 ` Valentin Schneider
2020-06-23 7:19 ` [tip: sched/urgent] " tip-bot2 for Scott Wood
2020-06-23 8:48 ` [tip: sched/urgent] sched/core: Check cpus_mask, not cpus_ptr in __set_cpus_allowed_ptr(), to fix mask corruption tip-bot2 for Scott Wood
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