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Subject[PATCH 2/3] work_on_cpu: Use our own workqueue.
From: Rusty Russell <rusty@rustcorp.com.au>

Impact: remove potential clashes with generic kevent workqueue

Annoyingly, some places we want to use work_on_cpu are already in
workqueues. As per Ingo's suggestion, we create a different workqueue
for work_on_cpu.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
---
kernel/workqueue.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- linux-2.6-for-ingo.orig/kernel/workqueue.c
+++ linux-2.6-for-ingo/kernel/workqueue.c
@@ -971,6 +971,8 @@ undo:
}

#ifdef CONFIG_SMP
+static struct workqueue_struct *work_on_cpu_wq __read_mostly;
+
struct work_for_cpu {
struct work_struct work;
long (*fn)(void *);
@@ -1001,7 +1003,7 @@ long work_on_cpu(unsigned int cpu, long
INIT_WORK(&wfc.work, do_work_for_cpu);
wfc.fn = fn;
wfc.arg = arg;
- schedule_work_on(cpu, &wfc.work);
+ queue_work_on(cpu, work_on_cpu_wq, &wfc.work);
flush_work(&wfc.work);

return wfc.ret;
@@ -1019,4 +1021,8 @@ void __init init_workqueues(void)
hotcpu_notifier(workqueue_cpu_callback, 0);
keventd_wq = create_workqueue("events");
BUG_ON(!keventd_wq);
+#ifdef CONFIG_SMP
+ work_on_cpu_wq = create_workqueue("work_on_cpu");
+ BUG_ON(!work_on_cpu_wq);
+#endif
}
--


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