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

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Message-ID: <AANLkTi=pXqya2vaUv2XNwRr6T==MW8ZtQ_yg6V9sipcy@mail.gmail.com>
Date:	Mon, 14 Feb 2011 17:38:52 +0000
From:	Will Newton <will.newton@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	hpa@...or.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, davem@...emloft.net, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org, Mike Frysinger <vapier@...too.org>,
	Chris Metcalf <cmetcalf@...era.com>,
	dhowells <dhowells@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"heiko.carstens" <heiko.carstens@...ibm.com>,
	benh <benh@...nel.crashing.org>
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

On Mon, Feb 14, 2011 at 5:27 PM, Peter Zijlstra <peterz@...radead.org> wrote:

>> So all but a few have basically (as you said on IRC)
>> #define atomic_read(v) ACCESS_ONCE(v)
>
> ACCESS_ONCE(v->counter), but yeah :-)

I maintain an out-of-tree architecture where that isn't the case
unfortunately [1]. Not expecting any special favours for being
out-of-tree of course, but just thought I would add that data point.

[1] Our atomic operations go around the cache rather than through it,
so the value of an atomic cannot be read with a normal load
instruction.
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