Commit 851a723e authored by Waiman Long's avatar Waiman Long Committed by Peter Zijlstra
Browse files

sched: Always clear user_cpus_ptr in do_set_cpus_allowed() 



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: default avatarPeter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarWaiman Long <longman@redhat.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220922180041.1768141-6-longman@redhat.com
parent da019032

kernel/sched/core.c

+7 −1
Original line number Diff line number Diff line
@@ -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,