linux-kernel - Re: [Regression, post-2.6.34-rc1][PATCH] x86 / perf: Fix suspend to RAM on HP nx6325

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Message-ID: <alpine.LFD.2.00.1003201043530.18017@i5.linux-foundation.org>
Date:	Sat, 20 Mar 2010 10:47:47 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression, post-2.6.34-rc1][PATCH] x86 / perf: Fix suspend to
 RAM on HP nx6325



On Sat, 20 Mar 2010, Peter Zijlstra wrote:
>  
>  	cpuhw = &per_cpu(cpu_hw_events, cpu);
> +	if (!cpuhw)
> +		return;

How can an address-of expression be NULL?

Yes, 'per_cpu()' is magic, but it shouldn't be possible to be _that_ 
magic. It's rather against the whole C model.

		Linus
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