linux-kernel - Re: [PATCH] ftrace: remove direct reference to mcount in trace code

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Date:	Thu, 28 Aug 2008 09:50:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ftrace: remove direct reference to mcount in trace code


* Steven Rostedt <rostedt@...dmis.org> wrote:

> The mcount record method of ftrace scans objdump for references to 
> mcount. Using mcount as the reference to test if the calls to mcount 
> being replaced are indeed calls to mcount, this use of mcount was also 
> caught as a location to change. Using a variable that points to the 
> mcount address moves this reference into the data section that is not 
> scanned, and we do not use a false location to try and modify.
> 
> The warn on code was what was used to detect this bug.
> 
> Signed-off-by: Steven Rostedt <srostedt@...hat.com>

applied to tip/tracing/ftrace - thanks Steve!

	Ingo
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