linux-kernel - Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support

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Message-ID: <20080627155656.GA19180@elte.hu>
Date:	Fri, 27 Jun 2008 17:56:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Nick Piggin <npiggin@...e.de>, Mark McLoughlin <markmc@...hat.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Stephen Tweedie <sct@...hat.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for
	64-bit Xen support


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Ingo Molnar wrote:
>> * Ingo Molnar <mingo@...e.hu> wrote:
>>
>>   
>>> that fixed the build but now we've got a boot crash with this config:
>>>     
>>
>> plus -tip auto-testing found another build failure with:
>>
>>  http://redhat.com/~mingo/misc/config-Thu_Jun_26_12_46_46_CEST_2008.bad
>>
>> arch/x86/kernel/entry_64.S: Assembler messages:
>> arch/x86/kernel/entry_64.S:1201: Error: invalid character '_' in mnemonic
>> arch/x86/kernel/entry_64.S:1205: Error: invalid character '_' in mnemonic
>> arch/x86/kernel/entry_64.S:1209: Error: invalid character '_' in mnemonic
>> arch/x86/kernel/entry_64.S:1213: Error: invalid character '_' in mnemonic
>>
>>   
>
> I'm confused.  How did this config both crash and not build?

i'm testing on multiple systems in parallel, each is running randconfig 
kernels. One 64-bit system found a build bug, the other one found a boot 
crash.

This can happen if certain configs build fine (but crash), certain 
configs dont even build. Each system does a random walk of the config 
space.

I've applied your two fixes and i'm re-testing.

	Ingo
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