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authorTejun Heo <tj@kernel.org>2011-06-23 11:19:27 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2011-06-27 15:17:07 -0700
commitfd7355ba1e936487f5aae6fc058c6cb300e44a64 (patch)
tree1f9292a0e34a14c5e47758d96b17f1d2d398b63a /kernel
parent6d3321e8e2b3bf6a5892e2ef673c7bf536e3f904 (diff)
stop_machine: reorganize stop_cpus() implementation
Refactor the queuing part of the stop cpus work from __stop_cpus() into queue_stop_cpus_work(). The reorganization is to help future improvements to stop_machine() and doesn't introduce any behavior difference. Signed-off-by: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/20110623182056.897818337@sbsiddha-MOBL3.sc.intel.com Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/stop_machine.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 0cae1cc323dc..4c89ee9fc56b 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -136,10 +136,11 @@ DEFINE_MUTEX(stop_cpus_mutex);
/* static data for stop_cpus */
static DEFINE_PER_CPU(struct cpu_stop_work, stop_cpus_work);
-int __stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
+static void queue_stop_cpus_work(const struct cpumask *cpumask,
+ cpu_stop_fn_t fn, void *arg,
+ struct cpu_stop_done *done)
{
struct cpu_stop_work *work;
- struct cpu_stop_done done;
unsigned int cpu;
/* initialize works and done */
@@ -147,9 +148,8 @@ int __stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
work = &per_cpu(stop_cpus_work, cpu);
work->fn = fn;
work->arg = arg;
- work->done = &done;
+ work->done = done;
}
- cpu_stop_init_done(&done, cpumask_weight(cpumask));
/*
* Disable preemption while queueing to avoid getting
@@ -161,7 +161,15 @@ int __stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
cpu_stop_queue_work(&per_cpu(cpu_stopper, cpu),
&per_cpu(stop_cpus_work, cpu));
preempt_enable();
+}
+static int __stop_cpus(const struct cpumask *cpumask,
+ cpu_stop_fn_t fn, void *arg)
+{
+ struct cpu_stop_done done;
+
+ cpu_stop_init_done(&done, cpumask_weight(cpumask));
+ queue_stop_cpus_work(cpumask, fn, arg, &done);
wait_for_completion(&done.completion);
return done.executed ? done.ret : -ENOENT;
}