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Date:	Mon, 09 Nov 2009 16:26:04 -0800
From:	David Daney <ddaney@caviumnetworks.com>
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To:	Wu Zhangjin <wuzhangjin@gmail.com>
CC:	linux-mips@linux-mips.org, linux-kernel@vger.kernel.org,
	zhangfx@lemote.com, zhouqg@gmail.com,
	Ralf Baechle <ralf@linux-mips.org>, rostedt@goodmis.org,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@elte.hu>,
	Nicholas Mc Guire <der.herr@hofr.at>,
	Richard Sandiford <rdsandiford@googlemail.com>,
	Patrik Kluba <kpajko79@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Michal Simek <monstr@monstr.eu>
Subject: Re: [PATCH v7 04/17] tracing: add static function tracer support
 for MIPS
References: <9dc81a7a9e5a292cccdf465c533a2b08d19d6021.1257779502.git.wuzhangjin@gmail.com> <b99c08397d9ff92ac5a72bda9131df41b702fc71.1257779502.git.wuzhangjin@gmail.com> <8f579e2cece16cd22358a4ec143ef6a8c462639b.1257779502.git.wuzhangjin@gmail.com> <cefe074f5eb3cfbc2e0bb41b0c1f61fcd0190d90.1257779502.git.wuzhangjin@gmail.com>
In-Reply-To: <cefe074f5eb3cfbc2e0bb41b0c1f61fcd0190d90.1257779502.git.wuzhangjin@gmail.com>
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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