linux-kernel - Re: vmcoreinfo: add the symbol "phys

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Date:	Thu, 17 Apr 2008 13:29:35 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, stable@...nel.org, jejb@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Kenichi Ohmichi <oomichi@....nes.nec.co.jp>
Subject: Re: vmcoreinfo: add the symbol "phys_base"

On Thu, Apr 17, 2008 at 10:16:16AM -0700, Chris Wright wrote:
> * Eric W. Biederman (ebiederm@...ssion.com) wrote:
> > Chris Wright <chrisw@...s-sol.org> writes:
> > 
> > > -stable review patch.  If anyone has any objections, please let us know.
> > > ---------------------
> > 
> > This patch seems quite reasonable.  However as I read it, it is
> > a feature enhancement, that allows a user space tool to function
> > better.  Do we backport trivial features into stable now?
> 
> Function better, meaning work reliably?  Sounds like a fix not a
> feature.
> 

I think in theory, makedumpfile should be able to guess phys_base by
looking at the vmcore ELF headers (Look for program headers which are
mapping kernel text and data and look at respective virtual address and
physical addresses.).

I think this patch just makes it explicit instead putting extra logic
for guessing the things.

To make sure makedumpfile is not broken with older kernels (in specific
configurations where phys_base is not zero), I think one can also modify
makedumpfile but I don't see any harm in putting this small change
in stable kernel.

Keni'chi, can you please throw some light here if makedumpfile is broken with
stable kernel or not (with phys_base not being zero).

Thanks
Vivek
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