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sched: Always clear user_cpus_ptr in do_set_cpus_allowed()

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The do_set_cpus_allowed() function is used by either kthread_bind() or
select_fallback_rq(). In both cases the user affinity (if any) should be
destroyed too.

Suggested-by: Peter Zijlstra <[email protected]>
Signed-off-by: Waiman Long <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
This commit is contained in:
Waiman Long authored and Peter Zijlstra committed 2022-10-27 11:01:22 +02:00
1 parent da01903281
commit 851a723e45
1 file changed
+7 -1
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kernel/sched/core.c
+7 -1
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@@ -2593,14 +2593,20 @@ __do_set_cpus_allowed(struct task_struct *p, struct affinity_context *ctx)
set_next_task(rq, p);
}
/*
* Used for kthread_bind() and select_fallback_rq(), in both cases the user
* affinity (if any) should be destroyed too.
*/
void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{
struct affinity_context ac = {
.new_mask = new_mask,
.flags = 0,
.user_mask = NULL,
.flags = SCA_USER, /* clear the user requested mask */
};
__do_set_cpus_allowed(p, &ac);
kfree(ac.user_mask);
}
int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src,