linux-kernel - Re: [PATCH 3/5] dump_stack: consolidate dump_stack() implementations and unify their behaviors

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Message-ID: <20130330114534.GA5404@osiris>
Date:	Sat, 30 Mar 2013 12:45:35 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, mingo@...hat.com, x86@...nel.org,
	rth@...ddle.net, linux@....linux.org.uk, msalter@...hat.com,
	starvik@...s.com, dhowells@...hat.com, tony.luck@...el.com,
	benh@...nel.crashing.org, takata@...ux-m32r.org,
	geert@...ux-m68k.org, james.hogan@...tec.com, monstr@...str.eu,
	ralf@...ux-mips.org, jonas@...thpole.se, rkuo@...eaurora.org,
	schwidefsky@...ibm.com, liqin.chen@...plusct.com,
	davem@...emloft.net, lethal@...ux-sh.org, vgupta@...opsys.com,
	chris@...kel.net, cmetcalf@...era.com, ysato@...rs.sourceforge.jp,
	gxt@...c.pku.edu.cn, jdike@...toit.com, linux-s390@...r.kernel.org,
	Mike Frysinger <vapier@...too.org>,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH 3/5] dump_stack: consolidate dump_stack() implementations
 and unify their behaviors

On Fri, Mar 29, 2013 at 07:27:06PM -0700, Tejun Heo wrote:
> Both dump_stack() and show_stack() are currently implemented by each
> architecture.  show_stack(NULL, NULL) dumps the backtrace for the
> current task as does dump_stack().  On some archs, dump_stack() prints
> extra information - pid, utsname and so on - in addition to the
> backtrace while the two are identical on other archs.

[...]

> This patch expands the dummy fallback dump_stack() implementation in
> lib/dump_stack.c such that it prints out debug information (taken from
> x86) and invokes show_stack(NULL, NULL) and drops arch-specific
> dump_stack() implementations in all archs except blackfin and s390.
> Blackfin's dump_stack() does something wonky that I don't understand
> and s390 prints its own debug information which includes fields which
> aren't accessible from arch-indepdent code.

The couple of extra fields aren't worth an s390 version of dump_stack()
that differs from all other architectures.
Please drop the s390 version as well. Thanks!

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