linux-kernel - Re: [PATCH 2/6] ide: move SFF I/O code to ide-io-sff.c

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Message-Id: <200901192012.51422.bzolnier@gmail.com>
Date:	Mon, 19 Jan 2009 20:12:51 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] ide: move SFF I/O code to ide-io-sff.c

On Monday 19 January 2009, Alan Cox wrote:
> >     Tried looking at how in*()/out*() are defined on x86?
> 
> Tried looking at how ide_mm_inb is defined on x86
> 
> > > It's already making function calls, without the benefit of inlining and
> > 
> >     I'm afraid you're wrong here.
> 
> I'm afraid you are the one who is wrong. The IDE layer is duplicating a
> generic level of indirection with its own code - purely because IDE
> pre-dates that core functionality. The whole IDE layer indirection can go
> away because Linux has caught up with the needs of the IDE layer.

I wish it would be so simple as I would have removed the said indirection
long time ago.  Unfortunately:

- not all archs support ioread() & co.

- there is still issue with cache aliasing on some CPUs

Once above deficiences get fixed we can look into ioread() conversion again.

[ IOW right now it is the correct thing to stick to ide_mm_*() indirection
  since extra hardware coverage is more valuable than minor code cleanup. ]

Thanks,
Bart
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