linux-kernel - Re: [patch] generic bug: use show_regs() instead of dump

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Date:	Fri, 29 Jun 2007 08:26:34 -0400
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Andi Kleen <ak@...e.de>, Kyle McMartin <kyle@...isc-linux.org>,
	Paul Mackerras <paulus@...ba.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] generic bug: use show_regs() instead of dump_stack()

Heiko Carstens wrote:
> [patch] generic bug: use show_regs() instead of dump_stack()
>
> From: Heiko Carstens <heiko.carstens@...ibm.com>
>
> The current generic bug implementation has a call to dump_stack() in
> case a WARN_ON(whatever) gets hit. Since report_bug(), which calls
> dump_stack(), gets called from an exception handler we can do better:
> just pass the pt_regs structure to report_bug() and pass it to
> show_regs() in case of a warning. This will give more debug informations
> like register contents, etc... In addition this avoids some pointless
> lines that dump_stack() emits, since it includes a stack backtrace of
> the exception handler which is of no interest in case of a warning.
> E.g. on s390 the following lines are currently always present in a stack
> backtrace if dump_stack() gets called from report_bug():
>   

Yep, seems reasonable to me.

Acked-by: Jeremy Fitzhardinge <jeremy@...source.com>

    J
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