linux-kernel - Re: [PATCH linux-next] x86_32: fix VisualWS and Voyager kexec build failures

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Date:	Wed, 2 Apr 2008 09:56:03 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	ebiederm@...ssion.com (Eric W. Biederman),
	linux-next@...r.kernel.org, gcosta@...hat.com
Cc:	lkml <linux-kernel@...r.kernel.org>, mingo <mingo@...hat.com>,
	tglx <tglx@...utronix.de>, hpa <hpa@...or.com>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH linux-next] x86_32: fix VisualWS and Voyager kexec build
 failures

On Wed, 02 Apr 2008 00:49:15 -0600 Eric W. Biederman wrote:

> Randy Dunlap <randy.dunlap@...cle.com> writes:
> 
> > From: Randy Dunlap <randy.dunlap@...cle.com>
> >
> > cc: Eric Biederman <ebiederm@...ssion.com>
> >
> > Both Visual WS and Voyager builds fail in almost the same way (in
> > linux-next) without this patch:
> >
> > VOYAGER:
> > kernel/built-in.o: In function `crash_kexec':
> > (.text+0x28588): undefined reference to `machine_crash_shutdown'
> >
> > VISWS:
> > kernel/built-in.o: In function `crash_kexec':
> > /next-20080401/kernel/kexec.c:1074: undefined reference to
> > `machine_crash_shutdown'
> > make[1]: *** [.tmp_vmlinux1] Error 1
> >
> > because arch/x86/kernel/reboot.c isn't built since CONFIG_X86_BIOS_REBOOT=n,
> > so machine_crash_shutdown() isn't available.
> 
> Weird.  I haven't had a chance to update to the devel kernels lately.
> And in the older kernel I have machine_crash_shutdown is in crash.c
> and is indeed not dependent xyz.
> 
> I get the feeling someone refactored something and ran afoul of the
> x86_32 weird subarchitecture stuff in their testing.
> 
> > This patch does seem a small bit odd since the KEXEC help text says that
> > kexec is independent of the system firmware.
> 
> Yes.
> 
> > Eric, is there some other way that this should be handled?
> 
> Yes.  Move machine_crash_shutdown back into crash.c
> Or find some other way to accomplish whatever cleanup was done,
> so that we still compile.

Well.  This is a problem in linux-next and in -mm, not yet in
mainline.  Hopefully this patch (wherever it is) won't be merged
into mainline in its present form.

---
~Randy
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