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membarrier: Disable preemption when calling smp_call_function_many()

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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]>
This commit is contained in:
Mathieu Desnoyers 2017-12-15 14:23:10 -05:00 • committed by Ingo Molnar
commit 541676078b
1 changed files with 2 additions and 0 deletions
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2
kernel/sched/membarrier.c
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@ -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();