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Re: [PATCH -v5 08/11] tracing: not trace mips_timecounter_init() in MIPS

To: wuzhangjin@gmail.com
Subject: Re: [PATCH -v5 08/11] tracing: not trace mips_timecounter_init() in MIPS
From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 09 Nov 2009 07:54:48 -0500
Cc: Frederic Weisbecker <fweisbec@gmail.com>, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, Ralf Baechle <ralf@linux-mips.org>, Nicholas Mc Guire <der.herr@hofr.at>, Richard Sandiford <rdsandiford@googlemail.com>, David Daney <ddaney@caviumnetworks.com>, Adam Nemet <anemet@caviumnetworks.com>, Patrik Kluba <kpajko79@gmail.com>
In-reply-to: <1257741072.3451.27.camel@falcon.domain.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <2f73eae542c47ac5bbb9f7280e6c0271d193e90d.1256483735.git.wuzhangjin@gmail.com> <3e0c2d7d8b8f196a8153beb41ea7f3cbf42b3d84.1256483735.git.wuzhangjin@gmail.com> <54c417629e91f40b2bbb4e08cda2a4e6527824c0.1256483735.git.wuzhangjin@gmail.com> <29bccff04932e993ecd9f516d8b6dcf84e2ceecf.1256483735.git.wuzhangjin@gmail.com> <72f2270f7b6e01ca7a4cdf4ac8c21778e5d9652f.1256483735.git.wuzhangjin@gmail.com> <cover.1256483735.git.wuzhangjin@gmail.com> <6140dd8f4e1783e5ac30977cf008bb98e4698322.1256483735.git.wuzhangjin@gmail.com> <49b3c441a57f4db423732f81432a3450ccb3240e.1256483735.git.wuzhangjin@gmail.com> <c62985530910251727o23beafcco539870e4b2f84637@mail.gmail.com> <1256550156.5642.148.camel@falcon> <20091102214351.GI4880@nowhere> <1257741072.3451.27.camel@falcon.domain.org>
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On Mon, 2009-11-09 at 12:31 +0800, Wu Zhangjin wrote:

> I think if we use something like __mips_notrace here, we may get lots of
> __ARCH_notraces here too, 'Cause some other platforms(at least, as I
> know, Microblaze will do it too) may also need to add one here, it will
> become:
> 
> __mips_notrace __ARCH1_notrace __ARCH2_notrace .... foo() {...}
> 
> A little ugly ;)

I agree, that is ugly.

> 
> and If a new platform need it's __ARCH_notrace, they need to touch the
> common part of ftrace, more side-effects!
> 
> but with __arch_notrace, the archs only need to touch it's own part,
> Although there is a side-effect as you mentioned above ;)
> 
> So, what should we do?

Just do it in the Makefile. We can add __arch_notrace, and then in the
Makefile define it with the arch.

ifeq ($(ARCH), MIPS)
        CFLAGS_foo.o = -D__arch_notrace=notrace
endif

And we can simply define __arch_notrace in a header:

#ifndef __arch_notrace
# define __arch_notrace
#endif

I much rather uglify the Makefile than the code. 

-- Steve



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