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authorOleg Nesterov <oleg@redhat.com>2015-10-09 18:00:49 +0200
committerIngo Molnar <mingo@kernel.org>2015-10-20 10:23:55 +0200
commitc00166d87e730088d919814020e96ffed129d0d1 (patch)
tree89194ca8d10e2c6ceddf203958e65787927d9f9b /kernel/smpboot.c
parentd8bc853582bfd81a9c08ca6922aeb01570080ccc (diff)
downloadlinux-sh-c00166d87e730088d919814020e96ffed129d0d1.tar.gz
stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()
1. Change smpboot_unpark_thread() to check ->selfparking, just like smpboot_park_thread() does. 2. Introduce stop_machine_unpark() which sets ->enabled and calls kthread_unpark(). 3. Change smpboot_thread_call() and cpu_stop_init() to call stop_machine_unpark() by hand. This way: - IMO the ->selfparking logic becomes more consistent. - We can kill the smp_hotplug_thread->pre_unpark() method. - We can easily unpark the stopper thread earlier. Say, we can move stop_machine_unpark() from smpboot_thread_call() to sched_cpu_active() as Peter suggests. 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/20151009160049.GA10166@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/smpboot.c')
-rw-r--r--kernel/smpboot.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index a818cbc73e14..d264f59bff56 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -222,9 +222,8 @@ static void smpboot_unpark_thread(struct smp_hotplug_thread *ht, unsigned int cp
{
struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu);
- if (ht->pre_unpark)
- ht->pre_unpark(cpu);
- kthread_unpark(tsk);
+ if (!ht->selfparking)
+ kthread_unpark(tsk);
}
void smpboot_unpark_threads(unsigned int cpu)