linux-kernel - Re: [PATCH 0/2] jump label: 2.6.38 updates

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Message-Id: <20110214.143336.226766324.davem@davemloft.net>
Date:	Mon, 14 Feb 2011 14:33:36 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mathieu.desnoyers@...ymtl.ca
Cc:	hpa@...or.com, rostedt@...dmis.org, peterz@...radead.org,
	will.newton@...il.com, jbaron@...hat.com, mingo@...e.hu,
	tglx@...utronix.de, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, masami.hiramatsu.pt@...achi.com,
	fweisbec@...il.com, avi@...hat.com, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org, vapier@...too.org,
	cmetcalf@...era.com, dhowells@...hat.com, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, benh@...nel.crashing.org
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Date: Mon, 14 Feb 2011 17:29:58 -0500

> * H. Peter Anvin (hpa@...or.com) wrote:
>> On 02/14/2011 02:20 PM, Steven Rostedt wrote:
>> > 
>> > Ideally, we would like a single atomic_read() but due to these wacky
>> > archs, it may not be possible.
>> > 
>> 
>> #ifdef ARCH_ATOMIC_READ_SUCKS_EGGS?
>> 
>> 	-hpa
> 
> lol :)
> 
> Hrm, I wonder if it might cause problems with combinations of "cmpxchg"
> and "read" performed on a variable (without using atomic.h).

We do that everywhere, it has to work.
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