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UPSTREAM: stop_machine: Fix stop_cpus_in_progress ordering

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Make sure the entire for loop has stop_cpus_in_progress set.

BUG=b:152605392
TEST=run power_VideoCall test

(cherry picked from commit 99d84bf8c65a7)

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
Signed-off-by: Joel Fernandes <joelaf@google.com>
Change-Id: I17b678ba09f877699831702122057d2e0cc7fd43
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2186280
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
This commit is contained in:
Peter Zijlstra 2019-05-29 20:36:37 +00:00 committed by spakkkk
parent c2f6ec5e1e
commit e8ab9a3cec
1 changed files with 2 additions and 0 deletions
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2
kernel/stop_machine.c
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@ -375,6 +375,7 @@ 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;
@ -383,6 +384,7 @@ 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();