linux-kernel - Re: 2.6.18-rc4-mm2: x86

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Date:	Tue, 22 Aug 2006 10:11:53 +0200
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Andrew Morton" <akpm@...l.org>, "Adrian Bunk" <bunk@...sta.de>
Cc:	"Andi Kleen" <ak@...e.de>, <linux-kernel@...r.kernel.org>,
	<discuss@...-64.org>
Subject: Re: 2.6.18-rc4-mm2: x86_64 compile error

>>> Adrian Bunk <bunk@...sta.de> 21.08.06 23:21 >>>
>On Sat, Aug 19, 2006 at 10:00:08PM -0700, Andrew Morton wrote:
>>...
>> Changes since 2.6.18-rc4-mm1:
>>...
>> +x86_64-mm-fix-x86-cpuid-keys-used-in-alternative_smp.patch
>>...
>>  x86_64 tree updates
>>...
>
>This patch causes the following compile error (cross compiling from i386 
>using gcc 4.1):
>
><--  snip  -->
>
>...
>  LD      .tmp_vmlinux1
>kernel/built-in.o:(.smp_altinstructions+0x10): undefined reference to `X86_FEATURE_UP'
>kernel/built-in.o:(.smp_altinstructions+0x28): undefined reference to `X86_FEATURE_UP'
>kernel/built-in.o:(.smp_altinstructions+0x40): undefined reference to `X86_FEATURE_UP'
>kernel/built-in.o:(.smp_altinstructions+0x58): undefined reference to `X86_FEATURE_UP'
>make[1]: *** [.tmp_vmlinux1] Error 1

Odd - asm/cpufeature.h is being included by asm/processor.h, which is included by
linux/sched.h, which in turn I would have assumed is included by virtually everything.
The simply solution would be to explicitly include it from asm/alternative.h - could you
give that a try? Regardless of that I'd be curious what source file under kernel/ (and
perhaps with what .config) neither includes linux/sched.h nor asm/processor.h.

Jan
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