[PATCH 5.10 263/290] sched/membarrier: fix missing local execution of ipi_sync_rq_state()

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From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>

commit ce29ddc47b91f97e7f69a0fb7cbb5845f52a9825 upstream.

The function sync_runqueues_membarrier_state() should copy the
membarrier state from the @mm received as parameter to each runqueue
currently running tasks using that mm.

However, the use of smp_call_function_many() skips the current runqueue,
which is unintended. Replace by a call to on_each_cpu_mask().

Fixes: 227a4aadc75b ("sched/membarrier: Fix p->mm->membarrier_state racy load")
Reported-by: Nadav Amit <nadav.amit@xxxxxxxxx>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 5.4.x+
Link: https://lore.kernel.org/r/74F1E842-4A84-47BF-B6C2-5407DFDD4A4A@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 kernel/sched/membarrier.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/kernel/sched/membarrier.c
+++ b/kernel/sched/membarrier.c
@@ -332,9 +332,7 @@ static int sync_runqueues_membarrier_sta
 	}
 	rcu_read_unlock();
 
-	preempt_disable();
-	smp_call_function_many(tmpmask, ipi_sync_rq_state, mm, 1);
-	preempt_enable();
+	on_each_cpu_mask(tmpmask, ipi_sync_rq_state, mm, true);
 
 	free_cpumask_var(tmpmask);
 	cpus_read_unlock();





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