linux-kernel - Re: [PATCH] [GIT PULL] tracing: allow to change permissions for text with dynamic ftrace enabled

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Message-Id: <1256668438.26028.414.camel@gandalf.stny.rr.com>
Date:	Tue, 27 Oct 2009 14:33:58 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] [GIT PULL] tracing: allow to change permissions for
 text with dynamic ftrace enabled

On Tue, 2009-10-27 at 11:20 -0800, Suresh Siddha wrote:

> Steven, Is it possible for dynamic ftrace to use the kernel identity
> mapping instead of the kernel text mapping for converting the tracing
> calls to nops etc.

Not sure what you mean by "kernel identity" mapping.

> 
> That way, we can still retain large page mappings for kernel text, while
> allowing the text to be changed.
> 
> I need to think through this to see if there are any subtle issues. What
> do you think?

Yeah, this is for now the quick fix. But I'm sure there can be better
changes to fix this.

-- Steve


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