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Date: Mon, 4 Feb 2019 01:02:38 -0800
From: tip-bot for Andrea Parri <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: paulmck@...ux.ibm.com, mingo@...nel.org,
torvalds@...ux-foundation.org, tglx@...utronix.de, efault@....de,
linux-kernel@...r.kernel.org, stern@...land.harvard.edu,
andrea.parri@...rulasolutions.com, hpa@...or.com,
will.deacon@....com, peterz@...radead.org
Subject: [tip:sched/core] sched/core: Use READ_ONCE()/WRITE_ONCE() in
move_queued_task()/task_rq_lock()
Commit-ID: c546951d9c9300065bad253ecdf1ac59ce9d06c8
Gitweb: https://git.kernel.org/tip/c546951d9c9300065bad253ecdf1ac59ce9d06c8
Author: Andrea Parri <andrea.parri@...rulasolutions.com>
AuthorDate: Mon, 21 Jan 2019 16:52:40 +0100
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 4 Feb 2019 09:13:21 +0100
sched/core: Use READ_ONCE()/WRITE_ONCE() in move_queued_task()/task_rq_lock()
move_queued_task() synchronizes with task_rq_lock() as follows:
move_queued_task() task_rq_lock()
[S] ->on_rq = MIGRATING [L] rq = task_rq()
WMB (__set_task_cpu()) ACQUIRE (rq->lock);
[S] ->cpu = new_cpu [L] ->on_rq
where "[L] rq = task_rq()" is ordered before "ACQUIRE (rq->lock)" by an
address dependency and, in turn, "ACQUIRE (rq->lock)" is ordered before
"[L] ->on_rq" by the ACQUIRE itself.
Use READ_ONCE() to load ->cpu in task_rq() (c.f., task_cpu()) to honor
this address dependency. Also, mark the accesses to ->cpu and ->on_rq
with READ_ONCE()/WRITE_ONCE() to comply with the LKMM.
Signed-off-by: Andrea Parri <andrea.parri@...rulasolutions.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Paul E. McKenney <paulmck@...ux.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Link: https://lkml.kernel.org/r/20190121155240.27173-1-andrea.parri@amarulasolutions.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
include/linux/sched.h | 4 ++--
kernel/sched/core.c | 9 +++++----
kernel/sched/sched.h | 6 +++---
3 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 351c0fe64c85..4112639c2a85 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1745,9 +1745,9 @@ static __always_inline bool need_resched(void)
static inline unsigned int task_cpu(const struct task_struct *p)
{
#ifdef CONFIG_THREAD_INFO_IN_TASK
- return p->cpu;
+ return READ_ONCE(p->cpu);
#else
- return task_thread_info(p)->cpu;
+ return READ_ONCE(task_thread_info(p)->cpu);
#endif
}
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 32e06704565e..ec1b67a195cc 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -107,11 +107,12 @@ struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
* [L] ->on_rq
* RELEASE (rq->lock)
*
- * If we observe the old CPU in task_rq_lock, the acquire of
+ * If we observe the old CPU in task_rq_lock(), the acquire of
* the old rq->lock will fully serialize against the stores.
*
- * If we observe the new CPU in task_rq_lock, the acquire will
- * pair with the WMB to ensure we must then also see migrating.
+ * If we observe the new CPU in task_rq_lock(), the address
+ * dependency headed by '[L] rq = task_rq()' and the acquire
+ * will pair with the WMB to ensure we then also see migrating.
*/
if (likely(rq == task_rq(p) && !task_on_rq_migrating(p))) {
rq_pin_lock(rq, rf);
@@ -916,7 +917,7 @@ static struct rq *move_queued_task(struct rq *rq, struct rq_flags *rf,
{
lockdep_assert_held(&rq->lock);
- p->on_rq = TASK_ON_RQ_MIGRATING;
+ WRITE_ONCE(p->on_rq, TASK_ON_RQ_MIGRATING);
dequeue_task(rq, p, DEQUEUE_NOCLOCK);
set_task_cpu(p, new_cpu);
rq_unlock(rq, rf);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 99e2a7772d16..c688ef5012e5 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1479,9 +1479,9 @@ static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
*/
smp_wmb();
#ifdef CONFIG_THREAD_INFO_IN_TASK
- p->cpu = cpu;
+ WRITE_ONCE(p->cpu, cpu);
#else
- task_thread_info(p)->cpu = cpu;
+ WRITE_ONCE(task_thread_info(p)->cpu, cpu);
#endif
p->wake_cpu = cpu;
#endif
@@ -1582,7 +1582,7 @@ static inline int task_on_rq_queued(struct task_struct *p)
static inline int task_on_rq_migrating(struct task_struct *p)
{
- return p->on_rq == TASK_ON_RQ_MIGRATING;
+ return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING;
}
/*
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