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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 <peterz@infradead.org>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220922180041.1768141-6-longman@redhat.com
This commit is contained in:
Waiman Long 2022-09-22 14:00:41 -04:00 • committed by Peter Zijlstra
parent da01903281
commit 851a723e45
1 changed files with 7 additions and 1 deletions
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8
kernel/sched/core.c
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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); 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) void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{ {
struct affinity_context ac = { struct affinity_context ac = {
.new_mask = new_mask, .new_mask = new_mask,
.flags = 0, .user_mask = NULL,
.flags = SCA_USER, /* clear the user requested mask */
}; };
__do_set_cpus_allowed(p, &ac); __do_set_cpus_allowed(p, &ac);
kfree(ac.user_mask);
} }
int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src, int dup_user_cpus_ptr(struct task_struct *dst, struct task_struct *src,