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

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Date:	Fri, 02 May 2008 15:49:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rdreier@...co.com
Cc:	Eric.Moore@....com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: HELP: Is writeq an atomic operation??

From: Roland Dreier <rdreier@...co.com>
Date: Fri, 02 May 2008 15:43:32 -0700

> Are there any 32-bit platforms with writeq()?  A quick grep suggests not.

Right, I guess there aren't, but what drivers do currently is roll
their own 64-bit MMIO for such cases.

I noticed this when writing drivers/net/niu.c

I suppose this is on purpose, so the driver can setup any
such protection and handling, as needed.
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