linux-kernel - Re: [PATCH -tip tracing/kprobes 3/6] kprobes/x86: Fix to add __kprobes to in-kernel fault handing functions

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Message-ID: <4AA194CE.30200@redhat.com>
Date:	Fri, 04 Sep 2009 18:29:34 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [PATCH -tip tracing/kprobes 3/6] kprobes/x86: Fix to add	__kprobes
 to in-kernel fault handing functions

Frederic Weisbecker wrote:
> On Wed, Sep 02, 2009 at 08:58:05AM -0400, Masami Hiramatsu wrote:
>> Frederic Weisbecker wrote:
>>> BTW, after your patchset:
>>>
>>> TEST    posttest
>>>    Building modules, stage 2.
>>> Error: c0101038:	2e a1 f8 b0 9e c0    	mov    %cs:0xc09eb0f8,%eax
>>> Error: objdump says 6 bytes, but insn_get_length() says 10 (attr:40000)
>>> make[1]: *** [posttest] Erreur 2
>>> make: *** [bzImage] Erreur 2
>>> make: *** Attente des tâches non terminées....
>>>    MODPOST 4 modules
>>>
>>>
>>> I'm cross compiling from 64 to 32 using:
>>>
>>> make ARCH=x86
>>>
>>> I've attached my config.
>>
>> Aah, you might miss an important patch :D
>> http://lkml.org/lkml/2009/8/28/367
>>
>> Thank you,
>>
>
>
> Well, even with this patch I have this problem occuring with
> make ARCH=x86
>
> Error: c125d65d:	0f 6f 02             	movq   (%edx),%mm0
> Error: objdump says 3 bytes, but insn_get_length() says 2 (attr:0)
> make[1]: *** [posttest] Erreur 2
> make: *** [bzImage] Erreur 2
>
> Hmm, may be that's because it doesn't support mmx instructions.
> The whole patchset is on
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git
> 	tracing/kprobes
>
> Config and make V=1 log attached.

Aah, Indeed. It's time to add MMX/SSE support on x86 insn decoder.

Thank you for reporting!

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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