linux-kernel - Re: [char-misc-next 07/15] mei: use wrietl/readl instead of io wrappers

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Message-ID: <20121204160618.585ac53d@bob.linux.org.uk>
Date:	Tue, 4 Dec 2012 16:06:18 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	"Winkler, Tomas" <tomas.winkler@...el.com>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: Re: [char-misc-next 07/15] mei: use wrietl/readl instead of io
 wrappers

On Tue, 4 Dec 2012 16:02:17 +0000
"Winkler, Tomas" <tomas.winkler@...el.com> wrote:

> > > > As to overhead. I'd love to see a measurement that can detect
> > > > the difference. Do you have a benchmark that shows it ?
> > >
> > > Don't have any numbers but it seems reasonable to me.
> > 
> > Processors are pretty good at prediction these days. I've not seen
> > any evidence to support the assumption.
> 
> I don't have strong opinion about it, yet what would be benefit of
> keeping the io abstraction layer, In case we are sure it is not used
> with io ports?

Less changes to existing working code being the obvious one.

Alan
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