From: Waiman Long <longman@redhat.com>
To: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Valentin Schneider <vschneid@redhat.com>,
Tejun Heo <tj@kernel.org>, Zefan Li <lizefan.x@bytedance.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Will Deacon <will@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Waiman Long <longman@redhat.com>
Subject: [PATCH v10 5/5] sched: Always clear user_cpus_ptr in do_set_cpus_allowed()
Date: Thu, 22 Sep 2022 14:00:41 -0400 [thread overview]
Message-ID: <20220922180041.1768141-6-longman@redhat.com> (raw)
In-Reply-To: <20220922180041.1768141-1-longman@redhat.com>
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
next prev parent reply other threads:[~2022-09-22 18:02 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-22 18:00 [PATCH v10 0/5] sched: Persistent user requested affinity Waiman Long
2022-09-22 18:00 ` [PATCH v10 1/5] sched: Add __releases annotations to affine_move_task() Waiman Long
2022-10-28 6:42 ` [tip: sched/core] " tip-bot2 for Waiman Long
2022-09-22 18:00 ` [PATCH v10 2/5] sched: Use user_cpus_ptr for saving user provided cpumask in sched_setaffinity() Waiman Long
2022-10-28 6:42 ` [tip: sched/core] sched: Always preserve the user requested cpumask tip-bot2 for Waiman Long
2023-01-17 16:08 ` [PATCH v10 2/5] sched: Use user_cpus_ptr for saving user provided cpumask in sched_setaffinity() Will Deacon
2023-01-17 18:13 ` Waiman Long
2023-01-20 17:59 ` Will Deacon
2023-01-20 18:10 ` Waiman Long
2023-01-26 12:52 ` Linux kernel regression tracking (#adding)
2023-02-10 17:15 ` Linux kernel regression tracking (#update)
2023-01-27 18:36 ` Peter Zijlstra
2023-01-27 19:09 ` Waiman Long
2022-09-22 18:00 ` [PATCH v10 3/5] sched: Enforce user requested affinity Waiman Long
2022-10-07 10:01 ` Peter Zijlstra
2022-10-07 14:57 ` Waiman Long
2022-10-07 15:23 ` Waiman Long
2022-10-28 6:42 ` [tip: sched/core] " tip-bot2 for Waiman Long
2022-09-22 18:00 ` [PATCH v10 4/5] sched: Handle set_cpus_allowed_ptr(), sched_setaffinity() & other races Waiman Long
2022-10-07 12:47 ` Peter Zijlstra
2022-10-07 18:59 ` Waiman Long
2022-10-28 6:42 ` [tip: sched/core] sched: Introduce affinity_context tip-bot2 for Waiman Long
2022-09-22 18:00 ` Waiman Long [this message]
2022-10-28 6:42 ` [tip: sched/core] sched: Always clear user_cpus_ptr in do_set_cpus_allowed() tip-bot2 for Waiman Long
2022-10-06 21:31 ` [PATCH v10 0/5] sched: Persistent user requested affinity Waiman Long
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