Commit-ID: 541676078b52f365f53d46ee5517d305cd1b6350 Gitweb: https://git.kernel.org/tip/541676078b52f365f53d46ee5517d305cd1b6350 Author: Mathieu Desnoyers <[email protected]> AuthorDate: Fri, 15 Dec 2017 14:23:10 -0500 Committer: Ingo Molnar <[email protected]> CommitDate: Wed, 10 Jan 2018 08:50:31 +0100
membarrier: Disable preemption when calling smp_call_function_many() smp_call_function_many() requires disabling preemption around the call. Signed-off-by: Mathieu Desnoyers <[email protected]> Cc: <[email protected]> # v4.14+ Cc: Andrea Parri <[email protected]> Cc: Andrew Hunter <[email protected]> Cc: Avi Kivity <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Boqun Feng <[email protected]> Cc: Dave Watson <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Maged Michael <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Paul E . McKenney <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- kernel/sched/membarrier.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c index dd79087..9bcbacb 100644 --- a/kernel/sched/membarrier.c +++ b/kernel/sched/membarrier.c @@ -89,7 +89,9 @@ static int membarrier_private_expedited(void) rcu_read_unlock(); } if (!fallback) { + preempt_disable(); smp_call_function_many(tmpmask, ipi_mb, NULL, 1); + preempt_enable(); free_cpumask_var(tmpmask); } cpus_read_unlock();
