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Date: Wed, 20 Aug 2014 08:24:08 +0200
From: Thomas Glanzmann <thomas@glanzmann.de>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@amacapital.net>, Baoquan He <bhe@redhat.com>,
        Borislav Petkov <bp@suse.de>, Dave Young <dyoung@redhat.com>,
        Eric Biederman <ebiederm@xmission.com>,
        Greg Kroah-Hartman <greg@kroah.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Matthew Garrett <mjg59@srcf.ucam.org>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        WANG Chao <chaowang@redhat.com>, Yinghai Lu <yinghai@kernel.org>,
        ubuntu@iam.tj
Subject: REGRESSION: 8fc5b4d: Unable to compile x86_64 kernel with x86_32
 userland
Message-ID: <20140820062408.GB14660@glanzmann.de>
Mail-Followup-To: Thomas Glanzmann <thomas@glanzmann.de>,
	Vivek Goyal <vgoyal@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@amacapital.net>, Baoquan He <bhe@redhat.com>,
	Borislav Petkov <bp@suse.de>, Dave Young <dyoung@redhat.com>,
	Eric Biederman <ebiederm@xmission.com>,
	Greg Kroah-Hartman <greg@kroah.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Michael Kerrisk <mtk.manpages@gmail.com>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	WANG Chao <chaowang@redhat.com>, Yinghai Lu <yinghai@kernel.org>,
	ubuntu@iam.tj
References: <20140820060423.GA14660@glanzmann.de>
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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