From: Scott Wood <sw...@redhat.com> [ 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 <sw...@redhat.com> Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Signed-off-by: Ingo Molnar <mi...@kernel.org> Link: https://lkml.kernel.org/r/20200617121742.cpxppyi7twxmp...@linutronix.de Signed-off-by: Sasha Levin <sas...@kernel.org> --- kernel/sched/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 7238ef445dafb..8b3e99d095ae0 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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); -- 2.25.1
