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Commit 54167607 authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Ingo Molnar
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membarrier: Disable preemption when calling smp_call_function_many() 



smp_call_function_many() requires disabling preemption around the call.

Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: <stable@vger.kernel.org> # v4.14+
Cc: Andrea Parri <parri.andrea@gmail.com>
Cc: Andrew Hunter <ahh@google.com>
Cc: Avi Kivity <avi@scylladb.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Dave Watson <davejwatson@fb.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maged Michael <maged.michael@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171215192310.25293-1-mathieu.desnoyers@efficios.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 414a2dc1

kernel/sched/membarrier.c

+2 −0
Original line number Diff line number Diff line
@@ -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();