On Sat, 27 Oct 2012, Tejun Heo wrote:
> Hello, Thomas.
>
> On Sat, Oct 27, 2012 at 07:29:25PM +0200, Thomas Gleixner wrote:
> > This is fully preemptible non cpu bound context though the comment in the
> > code says:
> >
> > * Must run on @pol->cpu. cpufreq core is responsible for ensuring
> > * that we're bound to the current CPU and pol->cpu stays online.
> >
> > The core only guarantees that pol->cpu stays online, but it has no way
> > to bind the thread and this needs to be fully preemptible context as
> > powernowk8_target_fn() calls functions which might sleep.
> >
> > So the correct solution is to always go through work_on_cpu().
>
> Yeah, that was stupid. Rafael already has a patch queued.
>
>
> http://git.kernel.org/?p=linux/kernel/git/rafael/linux-pm.git;a=commit;h=e4df1cbcc1f329e53a1fff7450b2229e0addff20
>
Good. So more people noticed :)
tglx
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