acpi: use queue_work_on() instead of binding workqueue worker to cpu0

ACPI works need to be executed on cpu0 and acpi/osl.c achieves this by
creating singlethread workqueue and then binding it to cpu0 from a
work which is quite unorthodox.  Make it create regular workqueues and
use queue_work_on() instead.  This is in preparation of concurrency
managed workqueue and the extra workers won't be a problem after it's
implemented.

Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 78418ce..46cce39 100644 (file)
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -191,36 +191,11 @@ acpi_status __init acpi_os_initialize(void)
        return AE_OK;
 }
 
-static void bind_to_cpu0(struct work_struct *work)
-{
-       set_cpus_allowed_ptr(current, cpumask_of(0));
-       kfree(work);
-}
-
-static void bind_workqueue(struct workqueue_struct *wq)
-{
-       struct work_struct *work;
-
-       work = kzalloc(sizeof(struct work_struct), GFP_KERNEL);
-       INIT_WORK(work, bind_to_cpu0);
-       queue_work(wq, work);
-}
-
 acpi_status acpi_os_initialize1(void)
 {
-       /*
-        * On some machines, a software-initiated SMI causes corruption unless
-        * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
-        * typically it's done in GPE-related methods that are run via
-        * workqueues, so we can avoid the known corruption cases by binding
-        * the workqueues to CPU 0.
-        */
-       kacpid_wq = create_singlethread_workqueue("kacpid");
-       bind_workqueue(kacpid_wq);
-       kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify");
-       bind_workqueue(kacpi_notify_wq);
-       kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug");
-       bind_workqueue(kacpi_hotplug_wq);
+       kacpid_wq = create_workqueue("kacpid");
+       kacpi_notify_wq = create_workqueue("kacpi_notify");
+       kacpi_hotplug_wq = create_workqueue("kacpi_hotplug");
        BUG_ON(!kacpid_wq);
        BUG_ON(!kacpi_notify_wq);
        BUG_ON(!kacpi_hotplug_wq);
@@ -766,7 +741,14 @@ static acpi_status __acpi_os_execute(acpi_execute_type type,
        else
                INIT_WORK(&dpc->work, acpi_os_execute_deferred);
 
-       ret = queue_work(queue, &dpc->work);
+       /*
+        * On some machines, a software-initiated SMI causes corruption unless
+        * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
+        * typically it's done in GPE-related methods that are run via
+        * workqueues, so we can avoid the known corruption cases by always
+        * queueing on CPU 0.
+        */
+       ret = queue_work_on(0, queue, &dpc->work);
 
        if (!ret) {
                printk(KERN_ERR PREFIX