linux-kernel - Re: [PATCH] perf_counter/powerpc: Check oprofile_cpu

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Date:	Thu, 6 Aug 2009 13:55:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org
Subject: Re: [PATCH] perf_counter/powerpc: Check oprofile_cpu_type for NULL
	before using it


* Paul Mackerras <paulus@...ba.org> wrote:

> From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 
> If the current CPU doesn't support performance counters,
> cur_cpu_spec->oprofile_cpu_type can be NULL.  The current perf_counter
> modules don't test for that case and would thus crash at boot time.
> 
> Bug reported by David Woodhouse.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Reported-by: David Woodhouse <dwmw2@...radead.org>
> Signed-off-by: Paul Mackerras <paulus@...ba.org>
> ---
> Ingo, this needs to go in for .31 since it fixes a boot-time oops.
> Are you going to be sending a batch to Linus shortly or should I send
> this to him separately?

Yeah, wanted to send a batch of fixes later today - so i've queued 
this one up too in perfcounters/urgent.

Thanks,

	Ingo
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