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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Date:	Tue, 01 Sep 2009 16:09:10 -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

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.
>
> Hmm, if you can, could you tell me the output of kernel build with V=1?
> I'd like to know whether posttest passed $(CONFIG_64BIT) or not.
>
> Thank you,
>
>>
>> Thanks.
>

Here is my result of 'make ARCH=x86' with your config-32 on x86-64.
---
   TEST    posttest
Succeed: decoded and checked 1735629 instructions
---

And also, I've tested test_get_len manually.

$ echo -e 'c0101038:\t2e a1 f8 b0 9e c0\t   mov    %cs:0xc09eb0f8,%eax' | arch/x86/tools/test_get_len
Succeed: decoded and checked 1 instructions

$ echo -e 'c0101038:\t2e a1 f8 b0 9e c0\t   mov    %cs:0xc09eb0f8,%eax' | arch/x86/tools/test_get_len y
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)

So, I assume that CONFIG_64BIT=y in your test environment. (I'm not sure why...)

Thank you,

-- 
Masami Hiramatsu

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

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

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