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stop_machine: Kill cpu_stop_threads->setup() and cpu_stop_unpark()

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Now that we always use stop_machine_unpark() to wake the stopper
threas up, we can kill ->setup() and fold cpu_stop_unpark() into
stop_machine_unpark().

And we do not need stopper->lock to set stopper->enabled = true.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: heiko.carstens@de.ibm.com
Link: http://lkml.kernel.org/r/20151009160051.GA10169@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2015-10-09 18:00:51 +02:00 committed by Ingo Molnar
parent c00166d87e
commit f0cf16cbd0
1 changed files with 1 additions and 11 deletions
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12
kernel/stop_machine.c
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@ -504,20 +504,11 @@ static void cpu_stop_park(unsigned int cpu)
WARN_ON(!list_empty(&stopper->works));
}
static void cpu_stop_unpark(unsigned int cpu)
{
struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
spin_lock_irq(&stopper->lock);
stopper->enabled = true;
spin_unlock_irq(&stopper->lock);
}
void stop_machine_unpark(int cpu)
{
struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
cpu_stop_unpark(cpu);
stopper->enabled = true;
kthread_unpark(stopper->thread);
}
@ -527,7 +518,6 @@ static struct smp_hotplug_thread cpu_stop_threads = {
.thread_fn = cpu_stopper_thread,
.thread_comm = "migration/%u",
.create = cpu_stop_create,
.setup = cpu_stop_unpark,
.park = cpu_stop_park,
.selfparking = true,
};