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sched/core: Check cpus_mask, not cpus_ptr in __set_cpus_allowed_ptr(), to fix mask corruption
[ 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>
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@ -1649,7 +1649,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
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goto out;
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}
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if (cpumask_equal(p->cpus_ptr, new_mask))
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if (cpumask_equal(&p->cpus_mask, new_mask))
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goto out;
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dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask);
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