workqueue: reimplement work_on_cpu() using system_wq

The existing work_on_cpu() implementation is hugely inefficient.  It
creates a new kthread, execute that single function and then let the
kthread die on each invocation.

Now that system_wq can handle concurrent executions, there's no
advantage of doing this.  Reimplement work_on_cpu() using system_wq
which makes it simpler and way more efficient.

stable: While this isn't a fix in itself, it's needed to fix a
        workqueue related bug in cpufreq/powernow-k8.  AFAICS, this
        shouldn't break other existing users.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: stable@vger.kernel.org

1 files changed, 8 insertions, 17 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index b80065a2450..3c5a79e2134 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3576,18 +3576,17 @@ static int __devinit workqueue_cpu_down_callback(struct notifier_block *nfb,
 #ifdef CONFIG_SMP
 
 struct work_for_cpu {
-        struct completion completion;
+        struct work_struct work;
         long (*fn)(void *);
         void *arg;
         long ret;
 };
 
-static int do_work_for_cpu(void *_wfc)
+static void work_for_cpu_fn(struct work_struct *work)
 {
-        struct work_for_cpu *wfc = _wfc;
+        struct work_for_cpu *wfc = container_of(work, struct work_for_cpu, work);
+
         wfc->ret = wfc->fn(wfc->arg);
-        complete(&wfc->completion);
-        return 0;
 }
 
 /**
@@ -3602,19 +3601,11 @@ static int do_work_for_cpu(void *_wfc)
  */
 long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
 {
-        struct task_struct *sub_thread;
-        struct work_for_cpu wfc = {
-                .completion = COMPLETION_INITIALIZER_ONSTACK(wfc.completion),
-                .fn = fn,
-                .arg = arg,
-        };
+        struct work_for_cpu wfc = { .fn = fn, .arg = arg };
 
-        sub_thread = kthread_create(do_work_for_cpu, &wfc, "work_for_cpu");
-        if (IS_ERR(sub_thread))
-                return PTR_ERR(sub_thread);
-        kthread_bind(sub_thread, cpu);
-        wake_up_process(sub_thread);
-        wait_for_completion(&wfc.completion);
+        INIT_WORK_ONSTACK(&wfc.work, work_for_cpu_fn);
+        schedule_work_on(cpu, &wfc.work);
+        flush_work(&wfc.work);
         return wfc.ret;
 }
 EXPORT_SYMBOL_GPL(work_on_cpu);