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Date: Mon, 19 Jan 2009 18:36:07 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>, linux-ide@vger.kernel.org,
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Subject: Re: [PATCH 2/6] ide: move SFF I/O code to ide-io-sff.c
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> > BTW if you moved to ioreadX you could get rid of almost all the readb/inb
> > special casing.
> 
>     And burden the driver code with function calls ISO in/out instructions, at 
> least on x86. It's somewhat arguable move.

And exactly how do you think the IDE accessors in the file get called ?
It's already making function calls, without the benefit of inlining and
sharing common paths across architectures that can handle more than just
PIO v MMIO but also other addressing modes.