diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2015-06-30 03:29:48 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-08-03 12:21:26 +0200 |
| commit | b377c2a089d4538e6e62e51fa595c896c314d83d (patch) | |
| tree | acff0609762feb9749087e199c216e752c8c61f1 /kernel | |
| parent | stop_machine: Move 'cpu_stopper_task' and 'stop_cpus_work' into 'struct cpu_s... (diff) | |
| download | linux-b377c2a089d4538e6e62e51fa595c896c314d83d.tar.xz linux-b377c2a089d4538e6e62e51fa595c896c314d83d.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/stop_machine.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index 6e677b003164..621220852df0 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -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); } |