linux-kernel - Re: [PATCH 1/1] Allow i386 crash kernels to handle x86

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Message-ID: <20070316073047.GD6689@verge.net.au>
Date:	Fri, 16 Mar 2007 16:30:49 +0900
From:	Horms <horms@...ge.net.au>
To:	Ian Campbell <Ian.Campbell@...Source.com>
Cc:	Vivek Goyal <vgoyal@...ibm.com>, hbabu@...ibm.com,
	fastboot@...ts.osdl.org, linux-kernel@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [PATCH 1/1] Allow i386 crash kernels to handle x86_64 dumps

On Fri, Mar 16, 2007 at 07:17:43AM +0000, Ian Campbell wrote:
> On Fri, 2007-03-16 at 08:48 +0900, Horms wrote:
> > > > 
> > > > Signed-off-by: Ian Campbell <ian.campbell@...source.com>
> > > > 
> > > > diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
> > > > index d960507..523e109 100644
> > > > --- a/fs/proc/vmcore.c
> > > > +++ b/fs/proc/vmcore.c
> > > > @@ -514,7 +514,7 @@ static int __init parse_crash_elf64_headers(void)
> > > >  	/* Do some basic Verification. */
> > > >  	if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 ||
> > > >  		(ehdr.e_type != ET_CORE) ||
> > > > -		!elf_check_arch(&ehdr) ||
> > > > +		!vmcore_elf_check_arch(&ehdr) ||
> > > >  		ehdr.e_ident[EI_CLASS] != ELFCLASS64 ||
> > > >  		ehdr.e_ident[EI_VERSION] != EV_CURRENT ||
> > > >  		ehdr.e_version != EV_CURRENT ||
> > > > diff --git a/include/asm-i386/kexec.h b/include/asm-i386/kexec.h
> > > > index 4dfc9f5..c76737e 100644
> > > > --- a/include/asm-i386/kexec.h
> > > > +++ b/include/asm-i386/kexec.h
> > > > @@ -47,6 +47,9 @@
> > > >  /* The native architecture */
> > > >  #define KEXEC_ARCH KEXEC_ARCH_386
> > > > 
> > > > +/* We can also handle crash dumps from 64 bit kernel. */
> > > > +#define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
> > > > +
> > > 
> > > Ideal place for this probably should have been arch dependent crash_dump.h
> > > file. But we don't have one and no point introducing one just for this 
> > > macro.
> > > 
> > > This change looks good to me.
> > 
> > Won't the above change break non i386 archtectures as
> > vmcore_elf_check_arch_cross isn't defined for them?
> 
> No, because of this hunk:

Thanks, silly me :(

-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/

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