linux-kernel - Re: Linux kernel crash dumps for ARM

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Message-ID: <20100105084850.GA27860@linux-sh.org>
Date:	Tue, 5 Jan 2010 17:48:51 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Venkappa Mala <Venkappa.Mala@...infotech.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"rmk+lkml@....linux.org.uk" <rmk+lkml@....linux.org.uk>,
	linux-kernel@...r.kernel.org,
	Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: Linux kernel crash dumps for ARM

On Mon, Jan 04, 2010 at 09:20:23PM -0800, Eric W. Biederman wrote:
> Venkappa Mala <Venkappa.Mala@...infotech.com> writes:
> >
> > 2) As per kexec supports, kexec-tool is required and this allows you to load directly
> >    to a new kernel from the currently running one
> >
> >     As from my side, i am not able to find arm implementation support in kexec-tools/crash sources.
> >
> >    - is kexce-tool supported for ARM or not?
> >
It would be rather counterintuitive for the kernel to support kexec and
the necessary userspace components not to.

The MAINTAINERS file says:

KEXEC
M:      Eric Biederman <ebiederm@...ssion.com>
W:      http://ftp.kernel.org/pub/linux/kernel/people/horms/kexec-tools/
L:      kexec@...ts.infradead.org
S:      Maintained
F:      include/linux/kexec.h
F:      kernel/kexec.c

While the above URL redirects to gitweb, resulting in:

http://git.kernel.org/?p=linux/kernel/git/horms/kexec-tools.git;a=summary

A peripheral grep of the kexec-tools source results in:

$ git grep kdump | grep arm
kexec/arch/arm/kexec-arm.c:     return 0; /* kdump is not supported on this platform (yet) */

So one could infer that kexec is supported on ARM whilst kdump is not. Adding
crashdump support requires both some kernel and kexec-tools glue, but is fairly
straightforward, just look at the other ports.
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