Messages in this thread Patch in this message | | | From | Vineeth Remanan Pillai <> | Subject | [RFC PATCH v4 01/19] stop_machine: Fix stop_cpus_in_progress ordering | Date | Wed, 30 Oct 2019 18:33:14 +0000 |
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From: Peter Zijlstra <peterz@infradead.org>
Make sure the entire for loop has stop_cpus_in_progress set.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- kernel/stop_machine.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index b4f83f7bdf86..c7031a22aa7b 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -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(); -- 2.17.1
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