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Date:	Sat, 12 Sep 2009 23:50:45 -0600
From:	Robert Hancock <>
To:	"Jung-Ik (John) Lee" <>
Cc:	Jeff Garzik <>,
	Daniel Walker <>,,, Grant Grundler <>,
	Gwendal Grignou <>,
	Eric Uhrhane <>
Subject: Re: [PATCH] libata: Add pata_atp867x driver for Artop/Acard ATP867X 

On Sat, Sep 12, 2009 at 10:55 PM, Jung-Ik (John) Lee <> 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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