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Date: Wed, 20 Aug 2014 11:48:18 -0400
From: Vivek Goyal <vgoyal@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.com>, Thomas Glanzmann <thomas@glanzmann.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@amacapital.net>, Baoquan He <bhe@redhat.com>,
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        Eric Biederman <ebiederm@xmission.com>,
        Greg Kroah-Hartman <greg@kroah.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: Re: REGRESSION: 8fc5b4d: Unable to compile x86_64 kernel with x86_32
 userland
Message-ID: <20140820154817.GA21518@redhat.com>
References: <20140820060423.GA14660@glanzmann.de>
 <20140820062408.GB14660@glanzmann.de>
 <20140820125630.GA12786@redhat.com>
 <30d943a9-ba4a-47ee-9333-0ffeea00c3a1@email.android.com>
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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)