On Mon, 2010-02-22 at 16:34 +0800, Américo Wang wrote:
quoted text
> On Sun, Feb 21, 2010 at 7:22 PM, Johannes Berg
> <johannes@sipsolutions.net> wrote:
> > On Sun, 2010-02-21 at 12:14 +0100, Johannes Berg wrote:
> >
> >>         printk("got cpu\n");
> >>         for_each_online_cpu(i) {
> >>                 sm_work = per_cpu_ptr(stop_machine_work,
> i);
> >>                 INIT_WORK(sm_work, stop_cpu);
> >>                 queue_work_on(i, stop_machine_wq, sm_work);
> >>         }
> >>         /* This will release the thread on our CPU. */
> >>         put_cpu();
> >>         printk("put cpu\n");
> >
> > As odd as that may be, it hangs in put_cpu() here.
> >
> 
> Hmm, does adding synchronize_sched() in _cpu_down() help?

No luck.

johannes

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