linux-kernel - REGRESSION: 8fc5b4d: Unable to compile x86_64 kernel with x86

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Date:	Wed, 20 Aug 2014 08:24:08 +0200
From:	Thomas Glanzmann <thomas@...nzmann.de>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Baoquan He <bhe@...hat.com>, Borislav Petkov <bp@...e.de>,
	Dave Young <dyoung@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	Greg Kroah-Hartman <greg@...ah.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	WANG Chao <chaowang@...hat.com>,
	Yinghai Lu <yinghai@...nel.org>, ubuntu@....tj
Subject: REGRESSION: 8fc5b4d: Unable to compile x86_64 kernel with x86_32
 userland

Hello Vivek,
commit 8fc5b4d introduces a regression that no longer allows to compile
x86_64 kernel under x86_32 userland. TJ on freenode/#kernel did analyze
it:

> (mini) [~/work/linux-2.6] make
> scripts/kconfig/conf --silentoldconfig Kconfig
>   CHK     include/config/kernel.release
>   UPD     include/config/kernel.release
>   CHK     include/generated/uapi/linux/version.h
>   CHK     include/generated/utsrelease.h
>   UPD     include/generated/utsrelease.h
>   CC      arch/x86/purgatory/purgatory.o
> arch/x86/purgatory/purgatory.c:1:0: error: code model 'large' not supported in the 32 bit mode
> make[1]: *** [arch/x86/purgatory/purgatory.o] Error 1
> make: *** [archprepare] Error 2

08:10 < TJ-> Glanzmann: The purgatory code from kexec is specifying ".code64"
08:11 < TJ-> Glanzmann: so when your local 32-bit linker tries to deal with that ... it errors
08:14 < TJ-> Glanzmann: there's only one introducing the purgatory stuff
08:14 < TJ-> 8fc5b4d Fri Aug 8 15:57:32 2014 -0700 Vivek Goyal purgatory: core purgatory functionality

Cheers,
        Thomas
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