linux-kernel - Re: [PATCH v9 09/10] tracing: reserve $12(t0) for mcount-ra-address of gcc 4.5

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Message-ID: <20091120172517.GI6869@linux-mips.org>
Date:	Fri, 20 Nov 2009 17:25:17 +0000
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Wu Zhangjin <wuzhangjin@...il.com>
Cc:	rostedt@...dmis.org, Nicholas Mc Guire <der.herr@...r.at>,
	zhangfx@...ote.com, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH v9 09/10] tracing: reserve $12(t0) for
	mcount-ra-address of gcc 4.5

On Fri, Nov 20, 2009 at 08:34:37PM +0800, Wu Zhangjin wrote:

> From: Wu Zhangjin <wuzhangjin@...il.com>
> 
> A new option -mmcount-ra-address for gcc 4.5 have been sent by David
> Daney <ddaney@...iumnetworks.com> in the thread "MIPS: Add option to
> pass return address location to _mcount", which help to record the
> location of the return address(ra) for the function graph tracer of MIPS
> to hijack the return address easier and safer. that option used the
> $12(t0) register by default, so, we reserve it for it, and use t1,t2,t3
> instead of t0,t1,t2.
> 
> Signed-off-by: Wu Zhangjin <wuzhangjin@...il.com>

Queued for 2.6.33 but due to patch 3/3 I won't propagate this series
immediately to linux-next.

Thanks!

  Ralf
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