linux-kernel - Re: [PATCH 1/5] Move elfcorehdr_addr out of vmcore.c (Was: Re: [patch] crashdump: fix undefined reference to `elfcorehdr

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Message-ID: <20080729022822.GA25975@redhat.com>
Date:	Mon, 28 Jul 2008 22:28:22 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	Chandru <chandru@...ibm.com>, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Terry Loftin <terry.loftin@...com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org
Subject: Re: [PATCH 1/5] Move elfcorehdr_addr out of vmcore.c (Was: Re:
	[patch] crashdump: fix undefined reference to `elfcorehdr_addr')

On Tue, Jul 29, 2008 at 11:22:48AM +1000, Simon Horman wrote:
> On Mon, Jul 28, 2008 at 03:47:41PM -0700, Eric W. Biederman wrote:
> > Vivek Goyal <vgoyal@...hat.com> writes:
> > 
> > > Hi All,
> > >
> > > How does following series of patches look like. I have moved
> > > elfcorehdr_addr out of vmcore.c and pushed it to arch dependent section 
> > > of crash dump to make sure that it can be worked with even when
> > > CONFIG_PROC_VMCORE is disabled and CONFIG_CRASH_DUMP is enabled.
> > >
> > > I tested it on x86_64. Compile tested it on i386 and ppc64. ia64 and
> > > sh versions are completely untested.
> > 
> > Given the current state of the code:
> > Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> > 
> > To process a kernel crash dump we pass the kernel elfcorehdr option,
> > so testing to see if it was passed seems reasonable.
> > 
> > In general I think this method of handling the problems with kdump is
> > too brittle to live, but in the case of iommus we certainly need to do
> > something different, and unfortunately iommus were not common on x86
> > when the original code was merged so we have not handled them well.
> 
> Agreed, however these patches look like they really ought to be merged
> into a single patch for the sake of bisect. As things stand, applying
> the first patch will break the build on each architecture with an
> architecture specific until the latter is applied.

That's a good point. I was not very sure because changes were in 
different arches and I broke the patch. At the same time changes are
really miniscule in each arch. 

So, for the sake of not breaking compilation for git-bisect, I will
generate a single patch tomorrow. (Until and unless somebody has an
objection).

Thanks
Vivek

> 
> -- 
> Horms
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