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stop_machine: Fix stop_cpus_in_progress ordering 

Make sure the entire for loop has stop_cpus_in_progress set.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Aaron Lu <aaron.lwe@gmail.com>
Cc: Valentin Schneider <valentin.schneider@arm.com>
Cc: mingo@kernel.org
Cc: Phil Auld <pauld@redhat.com>
Cc: Julien Desfossez <jdesfossez@digitalocean.com>
Cc: Nishanth Aravamudan <naravamudan@digitalocean.com>
Link: https://lkml.kernel.org/r/0fd8fd4b99b9b9aa88d8b2dff897f7fd0d88f72c.1559129225.git.vpillai@digitalocean.com
This commit is contained in:
Peter Zijlstra 2019-05-29 20:36:37 +00:00
parent de53fd7aed
commit 99d84bf8c6
1 changed files with 2 additions and 0 deletions
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2
kernel/stop_machine.c
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@ -383,6 +383,7 @@ static bool queue_stop_cpus_work(const struct cpumask *cpumask,
*/
preempt_disable();
stop_cpus_in_progress = true;
barrier();
for_each_cpu(cpu, cpumask) {
work = &per_cpu(cpu_stopper.stop_work, cpu);
work->fn = fn;
@ -391,6 +392,7 @@ static bool queue_stop_cpus_work(const struct cpumask *cpumask,
if (cpu_stop_queue_work(cpu, work))
queued = true;
}
barrier();
stop_cpus_in_progress = false;
preempt_enable();