linux-kernel - Re: [tip:x86/build] x86: Default to ARCH= x86 to avoid overriding CONFIG

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Date:	Wed, 26 Dec 2012 23:07:22 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	tglx@...utronix.de, "H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/build] x86: Default to ARCH= x86 to avoid overriding
 CONFIG_64BIT

On Wed, 2012-12-26 at 14:00 -0800, David Rientjes wrote:
> I do quite a bit of automated config and boot tests to try out 
> combinations that others may not have tested when developing their
> code; staging branches such as in tip are interesting to try because
> they haven't yet reached Linus and it's helpful to catch breakages
> before it reaches mainline.

Indeed. It seems quite broken at the moment.

Your config builds fine in the tip of Linus' current tree (with
ARCH=i386 or ARCH=x86 of course). But breaks on tip.git as you describe.
The first commit I hit when attempting to bisect (2bd24259f78) is
*differently* buggered:

  CC      arch/x86/kernel/ptrace.o
arch/x86/kernel/ptrace.c:1350:17: error: conflicting types for ‘syscall_trace_enter’
In file included from /ssd/git/tip/arch/x86/include/asm/vm86.h:130:0,
                 from /ssd/git/tip/arch/x86/include/asm/processor.h:10,
                 from /ssd/git/tip/arch/x86/include/asm/thread_info.h:22,
                 from include/linux/thread_info.h:56,
                 from include/linux/preempt.h:9,
                 from include/linux/spinlock.h:50,
                 from include/linux/seqlock.h:29,
                 from include/linux/time.h:8,
                 from include/linux/timex.h:56,
                 from include/linux/sched.h:56,
                 from arch/x86/kernel/ptrace.c:8:
/ssd/git/tip/arch/x86/include/asm/ptrace.h:146:13: note: previous declaration of ‘syscall_trace_enter’ was here

I'll persist, but the build failure you describe looks like it's a
simple failure of the 32-bit build in tip.git, which 'randconfig' was
*designed* to catch... but of course it wasn't doing its job very well
until I fixed it. It's entirely inappropriate to *blame* it on my patch.

-- 
dwmw2


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