linux-kernel - Re: [PATCH -v4 9/9] tracing: add function graph tracer support for MIPS

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Date:	Thu, 22 Oct 2009 14:00:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	wuzhangjin@...il.com, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, Thomas Gleixner <tglx@...utronix.de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Nicholas Mc Guire <der.herr@...r.at>
Subject: Re: [PATCH -v4 9/9] tracing: add function graph tracer support for
 MIPS

On Thu, 2009-10-22 at 09:16 -0700, David Daney wrote:
> Steven Rostedt wrote:

> > Functions that run off into another function?? I guess the compiler
> > could do that, but with -pg enable, I would think is broken.
> > 
> 
> Use of GCC-4.5's __builtin_unreachable() can lead to this, as well as 
> functions that call noreturn functions.

But still. Should that unreachable code have a "save ra to stack"? If
not, this method is still safe.

-- Steve


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