linux-kernel - Re: [RFC PATCH 2/8] jump label v4 - x86: Introduce generic jump patching without stop

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Message-ID: <20100118083129.675edb83@infradead.org>
Date:	Mon, 18 Jan 2010 08:31:29 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	"H. Peter Anvin" <hpa@...or.com>, rostedt@...dmis.org,
	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, tglx@...utronix.de, andi@...stfloor.org,
	roland@...hat.com, rth@...hat.com
Subject: Re: [RFC PATCH 2/8] jump label v4 - x86: Introduce generic jump
 patching without stop_machine

On Mon, 18 Jan 2010 10:59:30 -0500
Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Yeah, so in the latest patch, I updated it to use int3 even if
> len == 1. :-)
> 


int3 is not making a difference for your case; there is no guarantee
that the other processor even sees the "int3 inbetween state" at all;
if it's not safe without int3 then it won't be safe with int3 either.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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