linux-kernel - Re: [PATCH v2] pcmcia: Convert io_req_t to use kio_addr

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Date:	Sat, 22 Sep 2007 10:11:48 -0500
From:	Olof Johansson <olof@...om.net>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linuxppc-dev@...abs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pcmcia@...ts.infradead.org, linux-kernel@...r.kernel.org,
	hch@....de
Subject: Re: [PATCH v2] pcmcia: Convert io_req_t to use kio_addr_t

On Sat, Sep 22, 2007 at 12:25:51AM -0600, Matthew Wilcox wrote:
> On Fri, Sep 21, 2007 at 11:39:36PM +0100, Alan Cox wrote:
> > On Fri, 21 Sep 2007 17:15:16 -0500
> > Olof Johansson <olof@...om.net> wrote:
> > 
> > > Convert the io_req_t members to kio_addr_t, to allow use on machines with
> > > more than 16 bits worth of IO ports (i.e. secondary busses on ppc64, etc).
> > 
> > What about the formatting and field widths ?
> > 
> > ulong would probably be a lot saner than kio_addr_t and yet more type
> > obfuscation.
> 
> I don't think anyone uses ioports > 32bit.  Certainly i386 takes an int
> port as parameter to {in,out}[bwl] (and it really only uses 16-bits).
> parisc uses 24 bits.  I don't know what the various ppcs do, but pci
> bars can only be 32-bit for ioports.  So my opinion is that ioports
> should be uint, not ulong.

PPC would do just fine with 32-bit as well, which is what I wanted in
the first place. I just went with the local coding standard of pcmcia
and switched to kio_addr_t.

I suppose it's a janitorial todo item but with the maintainer MIA I
don't want to mess around with it too much, since I can't really test
much besides the PPC stuff I have.

As for the formatting/padding widths: Some platforms had ioaddr_t's
that were 32 bit already, so it was already broken on those, and the
only drawback is missing 0-padding. It'd look a bit silly to pad to 16
0:s anyway at the moment, so I think I'd prefer to keep it the way it is.


-Olof
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