linux-kernel - Re: [PATCH 0/2] ftrace updates

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Message-ID: <20080816133257.GA11063@elte.hu>
Date:	Sat, 16 Aug 2008 15:32:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH 0/2] ftrace updates


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

> Due to the new mcount recording method, the assumptions about the 
> records that hold the mcount locations have changed.  Now we need to 
> protect reading and writing of the records between module load and 
> reading of the debugfs files. There is not much contention here, but 
> they need to be protected none the less.
> 
> I simply use the ftrace_lock to accomplish this. The ftrace_lock 
> should never be held under interrupt context so disabling interrupts 
> should not be necessary. I've run this under lockdep and lockdep has 
> not complained.

applied to tip/tracing/ftrace - thanks Steve.

	Ingo
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