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

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Date:	Wed, 20 Aug 2014 18:21:26 +0200
From:	Thomas Glanzmann <thomas@...nzmann.de>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	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>,
	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: Re: REGRESSION: 8fc5b4d: Unable to compile x86_64 kernel with x86_32
 userland

Hello Vivek,

* Vivek Goyal <vgoyal@...hat.com> [2014-08-20 17:48]:
> --- linux-2.6.orig/arch/x86/purgatory/Makefile	2014-08-20 11:32:21.723559119 -0400
> +++ linux-2.6/arch/x86/purgatory/Makefile	2014-08-20 11:32:23.654570231 -0400
> @@ -11,6 +11,7 @@ targets += purgatory.ro
>  # sure how to relocate those. Like kexec-tools, use custom flags.

>  KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes -fno-zero-initialized-in-bss -fno-builtin -ffreestanding -c -MD -Os -mcmodel=large
> +KBUILD_CFLAGS += -m$(BITS)

>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>  		$(call if_changed,ld)

> Can you please try attached single line patch and see if it fixes the
> issue for you.

I tested the same and it works.

Tested-by: Thomas Glanzmann <thomas@...nzmann.de>

...
  CC      arch/x86/purgatory/purgatory.o
  AS      arch/x86/purgatory/stack.o
  AS      arch/x86/purgatory/setup-x86_64.o
  CC      arch/x86/purgatory/sha256.o
  AS      arch/x86/purgatory/entry64.o
  CC      arch/x86/purgatory/string.o
  LD      arch/x86/purgatory/purgatory.ro
  BIN2C   arch/x86/purgatory/kexec-purgatory.c
...

I also made sure that I backed out the other patch _before_ I tried this one.

Cheers,
        Thomas
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