linux-kernel - Re: [RFC v1 01/16] lib: devres: don't enclose pcim_*() functions in CONFIG_HAS

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Date:	Tue, 11 Dec 2012 17:32:32 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Maen Suleiman <maen@...vell.com>,
	Jason Cooper <jason@...edaemon.net>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Eran Ben-Avi <benavi@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Shadi Ammouri <shadi@...vell.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Yinghai Lu <yinghai@...nel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC v1 01/16] lib: devres: don't enclose pcim_*() functions in
 CONFIG_HAS_IOPORT

> with it.  It's very simple.  The IO port space is for ISA/PCMCIA and
> PCI IO port regions.  It is nothing more than that.

And on a lot of devices the LPC bus.

> Plus, if you _have_ IO space support, you must have some MMIO region for
> them to target - doing what many platforms have done to date and targetted
> ISA IO address 0 at virtual address 0 is just not on because as soon as
> you build a device driver which probes ISA addresses into your kernel,
> you will oops.

There shouldn't really be anything poking around that is modern - this is
true of some PC stuff too.

In general however if its because you have a window partly mapped you
could just catch the exception and load 0xFF for reads (and probably
whine with a backtrace so you know who to moan at).

Alan
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