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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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