Make sure the entire for loop has stop_cpus_in_progress set.
Cc: Valentin Schneider <valentin.schnei...@arm.com>
Cc: Aaron Lu <aaron....@gmail.com>
Cc: keesc...@chromium.org
Cc: mi...@kernel.org
Cc: Pawan Gupta <pawan.kumar.gu...@linux.intel.com>
Cc: Phil Auld <pa...@redhat.com>
Cc: torva...@linux-foundation.org
Cc: Tim Chen <tim.c.c...@linux.intel.com>
Cc: fweis...@gmail.com
Cc: subhra.mazum...@oracle.com
Cc: t...@linutronix.de
Cc: Julien Desfossez <jdesfos...@digitalocean.com>
Cc: p...@google.com
Cc: Nishanth Aravamudan <naravamu...@digitalocean.com>
Cc: Aubrey Li <aubrey.in...@gmail.com>
Cc: Mel Gorman <mgor...@techsingularity.net>
Cc: kerr...@google.com
Cc: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Link:
https://lkml.kernel.org/r/0fd8fd4b99b9b9aa88d8b2dff897f7fd0d88f72c.1559129225.git.vpil...@digitalocean.com
---
kernel/stop_machine.c | 2 ++
1 file changed, 2 insertions(+)
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -383,6 +383,7 @@ static bool queue_stop_cpus_work(const s
*/
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 s
if (cpu_stop_queue_work(cpu, work))
queued = true;
}
+ barrier();
stop_cpus_in_progress = false;
preempt_enable();
