linux-kernel - Re: [PATCH v2 2/6] mips dynamic function tracer support

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Message-ID: <4A26129E.1080008@windriver.com>
Date:	Wed, 03 Jun 2009 14:05:18 +0800
From:	Wang Liming <liming.wang@...driver.com>
To:	wu zhangjin <wuzhangjin@...il.com>
CC:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Wu Zhangjin <wuzj@...ote.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>
Subject: Re: [PATCH v2 2/6] mips dynamic function tracer support

wu zhangjin wrote:
> hi,
> 
> sorry, I'm so late to reply your E-mail, a little busy these days.
>>
>> }
>> ----------arch/mips/kernel/module.c:apply_r_mips_26_rel()-------------------
>>
>> v is kernel _mcount's address, location is the address of the instrution
>> that should be relocated;
>>
>> To resolve this problem, we may need to do more work, either on gcc or on
>> the kernel. So I want to hear your test result and if you have solution,
>> please let me know.
>>
> 
> yes, current version of mips-specific dynamic ftrace not support modules yet.
> 
> there is similar solution implemented in PowerPC(something named trampoline),
> although I did not look into it, but I'm sure we can implement the
> mips-specific one
> via imitating it.
Good hit. I may have a look on Powerpc implementation.

> 
> and currently, I'm planning to fix it in the -v3 of mips-specific
> ftrace support.
OK. I'm looking forward to your -v3 patches.

Thanks.
Liming Wang
> 
> best wishes,
> Wu Zhangjin
> 

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