From mboxrd@z Thu Jan  1 00:00:00 1970
From: nico@fluxnic.net (Nicolas Pitre)
Date: Wed, 21 Dec 2011 15:36:49 -0500 (EST)
Subject: [RFC PATCH] ARM: new architecture for Energy Micro's EFM32
 Cortex-M3 SoCs
In-Reply-To: <20111221195602.GK2577@n2100.arm.linux.org.uk>
References: <1324480428-13344-1-git-send-email-u.kleine-koenig@pengutronix.de>
 <20111221154838.GA23102@page> <20111221195602.GK2577@n2100.arm.linux.org.uk>
Message-ID: <alpine.LFD.2.02.1112211535010.2907@xanadu.home>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, 21 Dec 2011, Russell King - ARM Linux wrote:

> On Wed, Dec 21, 2011 at 03:48:50PM +0000, Jamie Iles wrote:
> > > +#define __io(a)			__typesafe_io(a)
> > 
> > Do you support io ports on this platform?  If not then perhaps select 
> > NO_IPORT and define __io(a) to 0?
> 
> Do not do that.  Define NO_IOPORT and *do* *not* define __io() at all to
> make drivers which use PCI IO stuff fail at build time.  Don't try to
> frig it into doing a NULL pointer deref.

... especially since this is a !MMU platform and therefore NULL pointer 
derefs won't work as intended.


Nicolas