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sched/core: Check cpus_mask, not cpus_ptr in __set_cpus_allowed_ptr(), to fix mask corruption

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[ Upstream commit fd844ba9ae59b51e34e77105d79f8eca780b3bd6 ]

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200617121742.cpxppyi7twxmpin7@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Scott Wood 2020-06-17 14:17:42 +02:00 • committed by Greg Kroah-Hartman
commit 1128ed7e1d
1 changed files with 1 additions and 1 deletions
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kernel/sched/core.c
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@ -1649,7 +1649,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
goto out;
}
if (cpumask_equal(p->cpus_ptr, new_mask))
if (cpumask_equal(&p->cpus_mask, new_mask))
goto out;
dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask);