linux-kernel - Re: [PATCH v7 17/17] tracing: make function graph tracer work with -mmcount-ra-address

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Message-ID: <4AF898E9.3050506@caviumnetworks.com>
Date:	Mon, 09 Nov 2009 14:34:17 -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 17/17] tracing: make function graph tracer work with
 -mmcount-ra-address

Wu Zhangjin wrote:
[...]
> +	cflags-y += $(call cc-option, -mmcount-ra-address)
[...]
> +#if (__GNUC__ <= 4 && __GNUC_MINOR__ < 5)



Sprinkling the code with these #if clauses is ugly and prone to breakage 
I think.

The Makefile part is testing for the same feature.

We do a very similar thing with -msym32, and KBUILD_SYM32.  Perhaps you 
could rework this patch in a similar manner and test for 
KBUILD_MCOUNT_RA_ADDRESS instead of the '(__GNUC__ <= 4 && 
__GNUC_MINOR__ < 5)'

David Daney
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