linux-kernel - Re: [PATCH v7 04/17] tracing: add static function tracer support for MIPS

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Date:	Thu, 12 Nov 2009 19:06:05 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	linux-mips@...ux-mips.org
Cc:	linux-kernel@...r.kernel.org, zhangfx@...ote.com, zhouqg@...il.com,
	Ralf Baechle <ralf@...ux-mips.org>, rostedt@...dmis.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Nicholas Mc Guire <der.herr@...r.at>,
	David Daney <ddaney@...iumnetworks.com>,
	Richard Sandiford <rdsandiford@...glemail.com>,
	Patrik Kluba <kpajko79@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Simek <monstr@...str.eu>
Subject: Re: [PATCH v7 04/17] tracing: add static function tracer support
 for MIPS

Hi, All

On Mon, 2009-11-09 at 23:31 +0800, Wu Zhangjin wrote:
[...]
> 
> And to support module tracing, we need to enable -mlong-calls for the
> long call from modules space to kernel space. -mlong-calls load the
> address of _mcount to a register and then jump to it, so, the address is
> allowed to be 32bit long, but without -mlong-calls, for the instruction
> "jal _mcount" only left 26bit for the address of _mcount, which is not
> enough for jumping from the module space to kernel space.
[...]
> diff --git a/arch/mips/Makefile b/arch/mips/Makefile
[...]
> +else
> +cflags-y := -mlong-calls
> +endif

Just made dynamic ftracer work without the above patch.

Will send it out as v8 later.

any more feedbacks to this v7 patchset?

Thanks & Regards,
	Wu Zhangjin

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