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Subject[PATCH v10 5/5] sched: Always clear user_cpus_ptr in do_set_cpus_allowed()
Date
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>
---
kernel/sched/core.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ce626cad4105..a5240c603667 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2599,14 +2599,20 @@ __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,
--
2.31.1
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