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stop_machine: Move 'cpu_stopper_task' and 'stop_cpus_work' into 'struct cpu_stopper'

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Multpiple DEFINE_PER_CPU's do not make sense, move all the per-cpu
variables into 'struct cpu_stopper'.

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/20150630012944.GA23924@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2015-06-30 03:29:44 +02:00 committed by Ingo Molnar
parent fe32d3cd5e
commit 02cb7aa923
1 changed files with 9 additions and 8 deletions
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17
kernel/stop_machine.c
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@ -35,13 +35,16 @@ struct cpu_stop_done {
/* the actual stopper, one per every possible cpu, enabled on online cpus */
struct cpu_stopper {
struct task_struct *thread;
spinlock_t lock;
bool enabled; /* is this stopper enabled? */
struct list_head works; /* list of pending works */
struct cpu_stop_work stop_work; /* for stop_cpus */
};
static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);
static DEFINE_PER_CPU(struct task_struct *, cpu_stopper_task);
static bool stop_machine_initialized = false;
/*
@ -74,7 +77,6 @@ static void cpu_stop_signal_done(struct cpu_stop_done *done, bool executed)
static void cpu_stop_queue_work(unsigned int cpu, struct cpu_stop_work *work)
{
struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
struct task_struct *p = per_cpu(cpu_stopper_task, cpu);
unsigned long flags;
@ -82,7 +84,7 @@ static void cpu_stop_queue_work(unsigned int cpu, struct cpu_stop_work *work)
if (stopper->enabled) {
list_add_tail(&work->list, &stopper->works);
wake_up_process(p);
wake_up_process(stopper->thread);
} else
cpu_stop_signal_done(work->done, false);
@ -293,7 +295,6 @@ void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
/* static data for stop_cpus */
static DEFINE_MUTEX(stop_cpus_mutex);
static DEFINE_PER_CPU(struct cpu_stop_work, stop_cpus_work);
static void queue_stop_cpus_work(const struct cpumask *cpumask,
cpu_stop_fn_t fn, void *arg,
@ -304,7 +305,7 @@ static void queue_stop_cpus_work(const struct cpumask *cpumask,
/* initialize works and done */
for_each_cpu(cpu, cpumask) {
work = &per_cpu(stop_cpus_work, cpu);
work = &per_cpu(cpu_stopper.stop_work, cpu);
work->fn = fn;
work->arg = arg;
work->done = done;
@ -317,7 +318,7 @@ static void queue_stop_cpus_work(const struct cpumask *cpumask,
*/
lg_global_lock(&stop_cpus_lock);
for_each_cpu(cpu, cpumask)
cpu_stop_queue_work(cpu, &per_cpu(stop_cpus_work, cpu));
cpu_stop_queue_work(cpu, &per_cpu(cpu_stopper.stop_work, cpu));
lg_global_unlock(&stop_cpus_lock);
}
@ -458,7 +459,7 @@ extern void sched_set_stop_task(int cpu, struct task_struct *stop);
static void cpu_stop_create(unsigned int cpu)
{
sched_set_stop_task(cpu, per_cpu(cpu_stopper_task, cpu));
sched_set_stop_task(cpu, per_cpu(cpu_stopper.thread, cpu));
}
static void cpu_stop_park(unsigned int cpu)
@ -485,7 +486,7 @@ static void cpu_stop_unpark(unsigned int cpu)
}
static struct smp_hotplug_thread cpu_stop_threads = {
.store = &cpu_stopper_task,
.store = &cpu_stopper.thread,
.thread_should_run = cpu_stop_should_run,
.thread_fn = cpu_stopper_thread,
.thread_comm = "migration/%u",