linux-kernel - Re: memory barrier question

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Message-ID: <18367.1284659954@redhat.com>
Date:	Thu, 16 Sep 2010 18:59:14 +0100
From:	David Howells <dhowells@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	dhowells@...hat.com, Miklos Szeredi <miklos@...redi.hu>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: memory barrier question

Peter Zijlstra <peterz@...radead.org> wrote:

> Therefore:
> 
>   A = 5
>   LOCK
> 
>   UNLOCK
>   B = 6
> 
> May be observed as:
> 
>    LOCK
>    B = 6
>    A = 5
>    UNLOCK

Yeah, you're right.

David
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