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Date: Mon, 14 Feb 2011 17:38:52 +0000
Message-ID: <AANLkTi=pXqya2vaUv2XNwRr6T==MW8ZtQ_yg6V9sipcy@mail.gmail.com>
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates
From: Will Newton <will.newton@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>, Jason Baron <jbaron@redhat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>, hpa@zytor.com,
        mingo@elte.hu, tglx@linutronix.de, andi@firstfloor.org,
        roland@redhat.com, rth@redhat.com, masami.hiramatsu.pt@hitachi.com,
        fweisbec@gmail.com, avi@redhat.com, davem@davemloft.net,
        sam@ravnborg.org, ddaney@caviumnetworks.com, michael@ellerman.id.au,
        linux-kernel@vger.kernel.org, Mike Frysinger <vapier@gentoo.org>,
        Chris Metcalf <cmetcalf@tilera.com>, dhowells <dhowells@redhat.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        "heiko.carstens" <heiko.carstens@de.ibm.com>,
        benh <benh@kernel.crashing.org>
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On Mon, Feb 14, 2011 at 5:27 PM, Peter Zijlstra <peterz@infradead.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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