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

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Date:	Mon, 09 Nov 2009 16:26:04 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	Wu Zhangjin <wuzhangjin@...il.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

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.

David Daney
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