From: "Paul E. McKenney" <paulmck@linux.ibm.com>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
"Paul E. McKenney" <paulmck@linux.ibm.com>
Subject: [PATCH tip/core/rcu 05/12] rcu: Add destroy_work_on_stack() to match INIT_WORK_ONSTACK()
Date: Thu, 1 Aug 2019 15:37:40 -0700 [thread overview]
Message-ID: <20190801223747.15560-5-paulmck@linux.ibm.com> (raw)
In-Reply-To: <20190801223708.GA14862@linux.ibm.com>
The synchronize_rcu_expedited() function has an INIT_WORK_ONSTACK(),
but lacks the corresponding destroy_work_on_stack(). This commit
therefore adds destroy_work_on_stack().
Reported-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Acked-by: Andrea Arcangeli <aarcange@redhat.com>
---
kernel/rcu/tree_exp.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index af7e7b9c86af..513b403b683b 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -792,6 +792,7 @@ static int rcu_print_task_exp_stall(struct rcu_node *rnp)
*/
void synchronize_rcu_expedited(void)
{
+ bool boottime = (rcu_scheduler_active == RCU_SCHEDULER_INIT);
struct rcu_exp_work rew;
struct rcu_node *rnp;
unsigned long s;
@@ -817,7 +818,7 @@ void synchronize_rcu_expedited(void)
return; /* Someone else did our work for us. */
/* Ensure that load happens before action based on it. */
- if (unlikely(rcu_scheduler_active == RCU_SCHEDULER_INIT)) {
+ if (unlikely(boottime)) {
/* Direct call during scheduler init and early_initcalls(). */
rcu_exp_sel_wait_wake(s);
} else {
@@ -835,5 +836,8 @@ void synchronize_rcu_expedited(void)
/* Let the next expedited grace period start. */
mutex_unlock(&rcu_state.exp_mutex);
+
+ if (likely(!boottime))
+ destroy_work_on_stack(&rew.rew_work);
}
EXPORT_SYMBOL_GPL(synchronize_rcu_expedited);
--
2.17.1
next prev parent reply other threads:[~2019-08-01 22:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-01 22:37 [PATCH tip/core/rcu 0/12] Miscellaneous fixes for v5.4 Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 01/12] lockdep: Make print_lock() address visible Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 02/12] time/tick-broadcast: Fix tick_broadcast_offline() lockdep complaint Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 03/12] rcu: Restore barrier() to rcu_read_lock() and rcu_read_unlock() Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 04/12] rcu: Add kernel parameter to dump trace after RCU CPU stall warning Paul E. McKenney
2019-08-01 22:37 ` Paul E. McKenney [this message]
2019-08-01 22:37 ` [PATCH tip/core/rcu 06/12] srcu: Avoid srcutorture security-based pointer obfuscation Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 07/12] rcu: Change return type of rcu_spawn_one_boost_kthread() Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 08/12] doc: Add rcutree.kthread_prio pointer to stallwarn.txt Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 09/12] idle: Prevent late-arriving interrupts from disrupting offline Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 10/12] rcu: Remove redundant "if" condition from rcu_gp_is_expedited() Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 11/12] arm: Use common outgoing-CPU-notification code Paul E. McKenney
2019-08-01 22:37 ` [PATCH tip/core/rcu 12/12] rcu: Fix spelling mistake "greate"->"great" Paul E. McKenney
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