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

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Message-ID: <f7583da0-c49c-48d9-b69e-0257db583115@email.android.com>
Date:	Wed, 20 Aug 2014 11:56:14 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vivek Goyal <vgoyal@...hat.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

Yes, that is exactly right.  The lack of -m64 is a bug.

On August 20, 2014 10:48:18 AM CDT, Vivek Goyal <vgoyal@...hat.com> wrote:
>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)

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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