linux-kernel - Re: [PATCH 2/2] Rewrite jump_label.c to use binary search

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Date:	Wed, 22 Sep 2010 11:02:50 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	jbaron@...hat.com, rusty@...tcorp.co.au, rostedt@...dmis.com,
	linux-kernel@...r.kernel.org, mingo@...e.hu, hpa@...or.com,
	tglx@...utronix.de, roland@...hat.com, rth@...hat.com,
	mhiramat@...hat.com, fweisbec@...il.com, avi@...hat.com,
	davem@...emloft.net, vgoyal@...hat.com, sam@...nborg.org,
	tony@...eyournoodle.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] Rewrite jump_label.c to use binary search

* Andi Kleen (andi@...stfloor.org) wrote:
> 
> >
> >>> +	for (; entry < stop && entry->key == key; entry++)
> >>> +		if (kernel_text_address(entry->code))
> >>
> >> This does not work for modules I'm afraid, only for the core kernel. You
> >> should test for __module_text_address() somewhere.
> >
> > I thought it was shared now, but ok.
> 
> Double checked. This is ok because kernel_text_address()
> already checks for modules. You were probably thinking
> of __kernel_text_address()

Ah right,

Although we have another problem:

__module_text_address() includes module init text, which defeats the
purpose of the check put in there by Jason.

So the check works for the core kernel, but not for modules.

Mathieu

> 
> -Andi
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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