linux-kernel - Re: [PATCH 1/5] ftrace: use module notifier for function tracer

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Message-ID: <alpine.DEB.1.10.0904221250280.24280@vinegar-pot.mit.edu>
Date:	Wed, 22 Apr 2009 18:20:39 -0400 (EDT)
From:	Tim Abbott <tabbott@....EDU>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Anders Kaseorg <andersk@....edu>,
	Jeffrey B Arnold <jbarnold@....edu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH 1/5] ftrace: use module notifier for function tracer

On Wed, 22 Apr 2009, Ingo Molnar wrote:

> I suspect ksplice could make use of text_mutex?

Yes, this is what I was imagining.  Thanks for pointing this out!  I plan 
to make Ksplice use this for the next version of the Ksplice patch series.

However, since Ksplice can be built as a module, we'll want to 
EXPORT_SYMBOL_GPL(text_mutex).  The comment above text_mutex's definition 
suggests some people would prefer not to have modules patching the kernel 
text, and so this point might be contentious.  I've found support for 
building Ksplice as a module to be a useful feature in case one needs to 
use multiple different versions of Ksplice on the same system (e.g. 
because the version built in to the kernel doesn't support a particular 
patch).

        -Tim Abbott

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