linux-kernel - Re: [patch 2.6.24-rc1] resource

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Message-ID: <20071025024405.3e960e9c@the-village.bc.nu>
Date:	Thu, 25 Oct 2007 02:44:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 2.6.24-rc1] resource_len() utility function

On Wed, 24 Oct 2007 18:20:52 -0700
David Brownell <david-b@...bell.net> wrote:

> Add a new resource_len() function, so drivers can start using this
> instead of driver-private code for a common idiom.  The call can be
> useful with at least:
> 
>  - request_region(), release_region()
>  - request_mem_region(), release_mem_region()
>  - ioremap()
> 
> Candidate drivers include those using platform or PNP busses, and
> maybe some others.  PCI already has a similar function.
> 
> This patch also updates a representative set of drivers in two
> subsystems to use this call (SPI, and USB peripheral/gadget).

PCI also increasingly is using functions that allow the user to choose to
map a resource as a resource (eg pci_iomap). So is it better to have
functions request_mem_resource(res)  free_mem_resource(res) and similar
instead or as well ?


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