linux-kernel - [tip:sched/core] stop_machine: Kill cpu_stop_threads->setup() and cpu_stop

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Date:	Tue, 20 Oct 2015 02:34:01 -0700
From:	tip-bot for Oleg Nesterov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	oleg@...hat.com, tglx@...utronix.de, paulmck@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, mingo@...nel.org,
	torvalds@...ux-foundation.org, tj@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com, riel@...hat.com,
	efault@....de, peterz@...radead.org
Subject: [tip:sched/core] stop_machine: Kill cpu_stop_threads->setup()
  and cpu_stop_unpark()

Commit-ID:  f0cf16cbd0659d2dd21352da9f06f3fab7a51596
Gitweb:     http://git.kernel.org/tip/f0cf16cbd0659d2dd21352da9f06f3fab7a51596
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Fri, 9 Oct 2015 18:00:51 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 20 Oct 2015 10:23:56 +0200

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

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@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: heiko.carstens@...ibm.com
Link: http://lkml.kernel.org/r/20151009160051.GA10169@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/stop_machine.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 59096a5..e5a09d2 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -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,
 };
--
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