linux-kernel - Re: [PATCH] libata: Add pata_atp867x driver for Artop/Acard ATP867X controllers

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Date:	Sat, 12 Sep 2009 23:50:45 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	"Jung-Ik (John) Lee" <jilee@...gle.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Daniel Walker <dwalker@...o99.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, Grant Grundler <grundler@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	Eric Uhrhane <ericu@...gle.com>
Subject: Re: [PATCH] libata: Add pata_atp867x driver for Artop/Acard ATP867X 
	controllers

On Sat, Sep 12, 2009 at 10:55 PM, Jung-Ik (John) Lee <jilee@...gle.com> wrote:
> I agree in that it's hard to measure/signify the additional overhead,
> since those io insts are already too slow.
> Anyways, the two extra "if"s and one PIO_MASK on every ioread/iowrite
> are pure overhead on top of in/out insts.

I don't think that any platform currently breaks if you use the
readX/writeX instead of ioreadX/iowriteX on iomapped MMIO addresses
(and there's certainly enough code in libata that does this), but the
API definition really expects that you should be using ioread/iowrite
so it would probably be best not to add any more of these..
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