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

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Message-ID: <20140820154817.GA21518@redhat.com>
Date:	Wed, 20 Aug 2014 11:48:18 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Glanzmann <thomas@...nzmann.de>
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>,
	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

On Wed, Aug 20, 2014 at 10:07:01AM -0500, H. Peter Anvin wrote:
> It says "32-bit mode" which means it is another issue: we are dropping -m64 at some point.

Thanks hpa. I am not adding -m64 to kbuild flags at all. So 32bit tool
chain must be assuming -m32 by default, and probably that's the issue.

Thomas, 

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

Thanks
Vivek


---
 arch/x86/purgatory/Makefile |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6/arch/x86/purgatory/Makefile
===================================================================
--- 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)
--
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