linux-kernel - Re: of_iomap() matched with plan iounmap()

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Date:	Fri, 19 Aug 2011 14:26:18 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	David Miller <davem@...emloft.net>, davidb@...eaurora.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: of_iomap() matched with plan iounmap()

On Friday 19 August 2011, David Miller wrote:
> From: David Brown <davidb@...eaurora.org>
> Date: Thu, 18 Aug 2011 10:02:26 -0700
> 
> > The SPARC target contains of_ioremap() and of_iounmap(), which various
> > drivers use (generally inside of CONFIG_SBUS).
> > 
> > include/linux/of_address.h contains a definition for of_iomap(), but
> > not corresponding unmap call.  Code using this calls the regular
> > iounmap().
> > 
> > Is it safe to assume that of_iomap() will always be based on ioremap()
> > and therefore it is safe to use iounmap(), or would it be better to
> > define another name for drivers to use as the inverse of of_iomap().
> > I'm not sure what to call it, since of_iounmap() is already taken by
> > SPARC.
> 
> It's better to define a matching of_iounmap() interface, even if for
> now it is exactly iounmap()

But the problem is that we need conflicting prototypes for of_iounmap.
Sparc currently has

extern void of_iounmap(struct resource *res, void __iomem *base, unsigned long size);
(as the reverse of of_ioremap)

While we would probably want the generic prototype to be
extern void of_iounmap(void __iomem *base);
(as the reverse of of_iomap)

We could of course change all existing users of of_iounmap on sparc to use
the simpler prototype, because it also just calls iounmap.

	Arnd
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