linux-kernel - Re: 2.6.25-rc7: warn_on

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Message-ID: <20080331020341.GB24702@atjola.homenet>
Date:	Mon, 31 Mar 2008 04:03:41 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	Bob Tracy <rct@...s.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.25-rc7: warn_on_slowpath triggered

On 2008.03.31 03:40:37 +0200, Björn Steinbrink wrote:
> [Added Ingo and Thomas to Cc:]
> 
> On 2008.03.29 17:29:55 -0500, Bob Tracy wrote:
> > System is a AMD K6-III/450.  This is actually a 2.6.25-rcX issue
> > that I'm just getting around to reporting.  Sorry about that...
> 
> Not necessarily a regression, it's just that the WARN_ON_ONCE didn't
> exist yet in 2.6.24.

Hm, the warnings seem to be a bit broken. They were added in
7d409d6057c7244f8757ce15245f6df27271be0c "x86: add some pirq debugging".

In pirq_via586_{get,set} and pirq_ite_{get,set}, they're missing the
fact that we're using pirq-1 to index the array. So it's spitting out
warnings for valid cases. So Bob's warning can very well be completely
bogus.

In pirq_ali_{get,set} there's probably the same problem, but I can't
really tell for sure, because pirq isn't used to index the array
directly, and the comment above that functions tells me not to guess
anything.

For pirq_vlsi_{get,set} I just wondered why that ">= 9" instead of "> 8"
as it is on the next line, but well, that's just style nit-picking...

Björn
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