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

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Date:	Tue, 10 Nov 2009 09:00:17 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	linux-mips@...ux-mips.org, 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>,
	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,

On Mon, 2009-11-09 at 16:26 -0800, David Daney wrote: 
> Wu Zhangjin wrote:
> 
> >  
> > +ifndef CONFIG_FUNCTION_TRACER
> >  cflags-y := -ffunction-sections
> > +else
> > +cflags-y := -mlong-calls
> > +endif
> >  cflags-y += $(call cc-option, -mno-check-zero-division)
> >  
> 
> That doesn't make sense to me.  Modules are already compiled with 
> -mlong-calls.  The only time you would need the entire kernel compiled 
> with -mlong-calls is if the tracer were in a module.  The logic here 
> doesn't seem to reflect that.

Yes, I knew the module have gotten the -mlong-calls, Here we just want
to use -mlong-calls for the whole kernel, and then we get the same
_mcount stuff in the whole kernel, at last, we can use the same
scripts/recordmcount.pl and ftrace_make_nop & ftrace_make_call for the
dynamic ftracer.

And seems we only need to enable it for the dynamic one. So, I will
split it out into it's own patch later.

Thanks & Regards,
	Wu Zhangjin

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