4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Mathieu Desnoyers <mathieu.desnoy...@efficios.com> commit 541676078b52f365f53d46ee5517d305cd1b6350 upstream. smp_call_function_many() requires disabling preemption around the call. Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com> Cc: Andrea Parri <parri.and...@gmail.com> Cc: Andrew Hunter <a...@google.com> Cc: Avi Kivity <a...@scylladb.com> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Boqun Feng <boqun.f...@gmail.com> Cc: Dave Watson <davejwat...@fb.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Maged Michael <maged.mich...@gmail.com> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Paul E . McKenney <paul...@linux.vnet.ibm.com> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Paul Mackerras <pau...@samba.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Link: http://lkml.kernel.org/r/20171215192310.25293-1-mathieu.desnoy...@efficios.com Signed-off-by: Ingo Molnar <mi...@kernel.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- kernel/sched/membarrier.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/sched/membarrier.c +++ b/kernel/sched/membarrier.c @@ -89,7 +89,9 @@ static int membarrier_private_expedited( 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();
