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stop_machine: Don't do for_each_cpu() twice in queue_stop_cpus_work() 

queue_stop_cpus_work() can do everything in one for_each_cpu() loop.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave@stgolabs.net
Cc: der.herr@hofr.at
Cc: paulmck@linux.vnet.ibm.com
Cc: riel@redhat.com
Cc: viro@ZenIV.linux.org.uk
Link: http://lkml.kernel.org/r/20150630012948.GA23927@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2015-06-30 03:29:48 +02:00 committed by Ingo Molnar
parent 02cb7aa923
commit b377c2a089
1 changed files with 7 additions and 10 deletions
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17
kernel/stop_machine.c
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@ -303,22 +303,19 @@ static void queue_stop_cpus_work(const struct cpumask *cpumask,
struct cpu_stop_work *work;
unsigned int cpu;
/* initialize works and done */
for_each_cpu(cpu, cpumask) {
work = &per_cpu(cpu_stopper.stop_work, cpu);
work->fn = fn;
work->arg = arg;
work->done = done;
}
/*
* Disable preemption while queueing to avoid getting
* preempted by a stopper which might wait for other stoppers
* to enter @fn which can lead to deadlock.
*/
lg_global_lock(&stop_cpus_lock);
for_each_cpu(cpu, cpumask)
cpu_stop_queue_work(cpu, &per_cpu(cpu_stopper.stop_work, cpu));
for_each_cpu(cpu, cpumask) {
work = &per_cpu(cpu_stopper.stop_work, cpu);
work->fn = fn;
work->arg = arg;
work->done = done;
cpu_stop_queue_work(cpu, work);
}
lg_global_unlock(&stop_cpus_lock);
}