linux-kernel - Re: irq-disabled vs vmap vs text

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Date:	Tue, 17 Feb 2009 12:28:50 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	akpm <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>
Subject: Re: irq-disabled vs vmap vs text_poke

* Steven Rostedt (rostedt@...dmis.org) wrote:
> 
> On Tue, 17 Feb 2009, Mathieu Desnoyers wrote:
> > > 
> > 
> > Anyway dynamic ftrace only need to do code patching at early boot,
> > right? Or do you need also to patch the call sites a bit later too ?
> > Because there is a text_poke_early for that purpose : modifying code
> > when it is still writable.
> 
> It modifies the code both at early boot up, and when it is enabled later 
> on at run time.
> 
> -- Steve
> 

OK, so without text_poke, how does it deal with kernel with text pages
marked read-only after boot ?

Mathieu


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Mathieu Desnoyers
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