linux-kernel - Re: [PATCH V5 3/4] ARM: Xilinx: base header files and assembly macros

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Date:	Wed, 30 Mar 2011 13:44:45 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	John Linn <john.linn@...inx.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux@....linux.org.uk, catalin.marinas@....com,
	glikely@...retlab.ca, jamie@...ieiles.com
Subject: Re: [PATCH V5 3/4] ARM: Xilinx: base header files and assembly macros

Hi John,

I looked over the latest version of your patches, everything looks
good to me, but I found one problem that you have probably copied
from other platforms:

On Wednesday 30 March 2011, John Linn wrote:
> +
> +/* Allow IO space to be anywhere in the memory */
> +
> +#define IO_SPACE_LIMIT 0xffff
> +
> +/* IO address mapping macros, nothing special at this time but required */
> +
> +#ifdef __ASSEMBLER__
> +#define IOMEM(x)               (x)
> +#else
> +#define IOMEM(x)               ((void __force __iomem *)(x))
> +#endif
> +
> +#define __io(a)                        __typesafe_io(a)
> +#define __mem_pci(a)           (a)

The definition of __io() looks wrong, so any call to inb()/outb()
will be a wild pointer access when you add PCI support.

If you don't plan to support PCI in the future, there should
be no problem.

	Arnd
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