Re: Missing put_cpu() in arch/ia64/sn/kernel/sn2/sn_hwperf.c?

From: Robin Holt
Date: Thu Aug 11 2011 - 06:58:37 EST

On Thu, Aug 11, 2011 at 08:12:45AM +0200, Jes Sorensen wrote:
> On 08/08/11 23:37, Tony Luck wrote:
> > On Mon, Aug 8, 2011 at 11:05 AM, Thomas Meyer <thomas@xxxxxxxx> wrote:
> >> The function sn_hwperf_op_cpu() seems to miss a corresponding put_cpu().
> >>
> >> Or is this done in another function? I didn't find it.
> >
> > It would be hard to do it elsewhere - this function may not have done
> > a get_cpu() [in the cpu == SN_HWPERF_ARG_ANY_CPU case].
> >
> > The logic is a bit tortuous here ... perhaps simpler to split the tests
> > up. Does the attached patch look right?
> Hi Tony,
> You probably want someone from SGI to look at it, so I'll forward to
> Robin Holt.
> I haven't been at SGI for about 2 years now :)

And I will bounce the question on to Jack. I believe he will probably
pass it on to somebody more familiar with sn_hwperf. Tony's patch looks
much clearer to me. I would have answered that I thought this was the
right patch until I saw the '... else { put_cpu(); ...' which made me
think we need a closer look.

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