Commit-ID: 541676078b52f365f53d46ee5517d305cd1b6350 Gitweb: https://git.kernel.org/tip/541676078b52f365f53d46ee5517d305cd1b6350 Author: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> AuthorDate: Fri, 15 Dec 2017 14:23:10 -0500 Committer: Ingo Molnar <mingo@xxxxxxxxxx> 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 <mathieu.desnoyers@xxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # v4.14+ Cc: Andrea Parri <parri.andrea@xxxxxxxxx> Cc: Andrew Hunter <ahh@xxxxxxxxxx> Cc: Avi Kivity <avi@xxxxxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Boqun Feng <boqun.feng@xxxxxxxxx> Cc: Dave Watson <davejwatson@xxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Maged Michael <maged.michael@xxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Paul E . McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/20171215192310.25293-1-mathieu.desnoyers@xxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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(); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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