linux-kernel - Re: HELP: Is writeq an atomic operation??

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Message-Id: <20080502.153210.122414532.davem@davemloft.net>
Date:	Fri, 02 May 2008 15:32:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Eric.Moore@....com
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: HELP: Is writeq an atomic operation??

From: "Moore, Eric" <Eric.Moore@....com>
Date: Fri, 2 May 2008 16:19:49 -0600

> Is a 64bit write to MMIO registers an atomic operation when using the
> writeq API?  

The answer to this question this is platform dependent.

On most 64-bit platforms, it is.  On some 32-bit ones, it is not.

This is not a SCSI layer question, so belongs minimally on
linux-kernel which I've CC:'d.
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