linux-kernel - Re: [PATCH-RFC 1/2] tile: don't panic on iomap

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Message-Id: <201111292205.11544.arnd@arndb.de>
Date:	Tue, 29 Nov 2011 22:05:11 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>
Cc:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH-RFC 1/2] tile: don't panic on iomap

On Tuesday 29 November 2011, Michael S. Tsirkin wrote:
> diff --git a/arch/tile/include/asm/io.h b/arch/tile/include/asm/io.h
> index c9ea165..be6090d 100644
> --- a/arch/tile/include/asm/io.h
> +++ b/arch/tile/include/asm/io.h
> @@ -204,7 +204,8 @@ static inline long ioport_panic(void)
>  
>  static inline void __iomem *ioport_map(unsigned long port, unsigned int len)
>  {
> -       return (void __iomem *) ioport_panic();
> +       pr_info("Trying to map an IO resource - it does not exit on tile.\n");
> +       return NULL;
>  }

Why not just set CONFIG_NO_IOPORT and make this unavailable at compile time?

	Arnd
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