linux-kernel - Re: Missing put_cpu() in arch/ia64/sn/kernel/sn2/sn

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Message-ID: <20110811105829.GA11879@sgi.com>
Date:	Thu, 11 Aug 2011 05:58:29 -0500
From:	Robin Holt <holt@....com>
To:	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Jack Steiner <steiner@....com>, mike travis <travis@....com>
Cc:	Tony Luck <tony.luck@...el.com>, Thomas Meyer <thomas@...3r.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Julia Lawall <julia@...u.dk>
Subject: Re: Missing put_cpu() in arch/ia64/sn/kernel/sn2/sn_hwperf.c?

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@...3r.de> 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.

Thanks,
Robin
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