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Date: Fri, 02 May 2008 15:49:07 -0700 (PDT)
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Subject: Re: HELP: Is writeq an atomic operation??
From: David Miller <davem@davemloft.net>
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From: Roland Dreier <rdreier@cisco.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.