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

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Message-ID: <0631C836DBF79F42B5A60C8C8D4E822901047B3A@NAMAIL2.ad.lsil.com>
Date:	Fri, 2 May 2008 16:49:55 -0600
From:	"Moore, Eric" <Eric.Moore@....com>
To:	"Roland Dreier" <rdreier@...co.com>,
	"David Miller" <davem@...emloft.net>
Cc:	<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: HELP: Is writeq an atomic operation??

>  > 
>  > The answer to this question this is platform dependent.
>  > 
>  > On most 64-bit platforms, it is.  On some 32-bit ones, it is not.
> 
> Are there any 32-bit platforms with writeq()?  A quick grep 
> suggests not.

I think writeq defined in include/asm-x86/io_64.h

> 
> Are there any 64-bit platforms where writeq() allows the MMIO to be
> split into multiple cycles from the target device's view?  I've been
> coding assuming that at least no other MMIO writes will reach 
> the device
> in the middle of a writeq().
> 

I hope that is the case.
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