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stop_machine: Introduce __cpu_stop_queue_work() and cpu_stop_queue_two_works() 

Preparation to simplify the review of the next change. Add two simple
helpers, __cpu_stop_queue_work() and cpu_stop_queue_two_works() which
simply take a bit of code from their callers.

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/20151008145134.GA18146@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2015-10-08 16:51:34 +02:00 committed by Ingo Molnar
parent 233e7f267e
commit 5caa1c089a
1 changed files with 26 additions and 11 deletions
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37
kernel/stop_machine.c
View File

@ -73,21 +73,24 @@ static void cpu_stop_signal_done(struct cpu_stop_done *done, bool executed)
}
}
static void __cpu_stop_queue_work(struct cpu_stopper *stopper,
struct cpu_stop_work *work)
{
list_add_tail(&work->list, &stopper->works);
wake_up_process(stopper->thread);
}
/* queue @work to @stopper. if offline, @work is completed immediately */
static void cpu_stop_queue_work(unsigned int cpu, struct cpu_stop_work *work)
{
struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
unsigned long flags;
spin_lock_irqsave(&stopper->lock, flags);
if (stopper->enabled) {
list_add_tail(&work->list, &stopper->works);
wake_up_process(stopper->thread);
} else
if (stopper->enabled)
__cpu_stop_queue_work(stopper, work);
else
cpu_stop_signal_done(work->done, false);
spin_unlock_irqrestore(&stopper->lock, flags);
}
@ -213,6 +216,16 @@ static int multi_cpu_stop(void *data)
return err;
}
static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1,
int cpu2, struct cpu_stop_work *work2)
{
lg_double_lock(&stop_cpus_lock, cpu1, cpu2);
cpu_stop_queue_work(cpu1, work1);
cpu_stop_queue_work(cpu2, work2);
lg_double_unlock(&stop_cpus_lock, cpu1, cpu2);
return 0;
}
/**
* stop_two_cpus - stops two cpus
* @cpu1: the cpu to stop
@ -260,10 +273,12 @@ int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void *
return -ENOENT;
}
lg_double_lock(&stop_cpus_lock, cpu1, cpu2);
cpu_stop_queue_work(cpu1, &work1);
cpu_stop_queue_work(cpu2, &work2);
lg_double_unlock(&stop_cpus_lock, cpu1, cpu2);
if (cpu1 > cpu2)
swap(cpu1, cpu2);
if (cpu_stop_queue_two_works(cpu1, &work1, cpu2, &work2)) {
preempt_enable();
return -ENOENT;
}
preempt_enable();