linux-kernel - Re: [PATCH 01/05] resource: add resource

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Message-ID: <20080718075426.GK24620@fluff.org.uk>
Date:	Fri, 18 Jul 2008 08:54:26 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	gregkh@...e.de, lethal@...ux-sh.org, i2c@...sensors.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 01/05] resource: add resource_size()

On Fri, Jul 18, 2008 at 04:40:10PM +0900, Magnus Damm wrote:
> From: Magnus Damm <damm@...l.co.jp>
> 
> Avoid one-off errors by introducing a resource_size() function.
> 
> Signed-off-by: Magnus Damm <damm@...l.co.jp>

A resource_size definition is a good idea, given the number of
times it has been re-implemented throughout the kernel.

> ---
> 
>  include/linux/ioport.h |    4 ++++
>  kernel/resource.c      |    2 +-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> --- 0001/include/linux/ioport.h
> +++ work/include/linux/ioport.h	2008-07-09 12:59:04.000000000 +0900
> @@ -113,6 +113,10 @@ extern int allocate_resource(struct reso
>  int adjust_resource(struct resource *res, resource_size_t start,
>  		    resource_size_t size);
>  resource_size_t resource_alignment(struct resource *res);
> +static inline resource_size_t resource_size(struct resource *res)
> +{
> +	return res->end - res->start + 1;
> +}
>  
>  /* Convenience shorthand with allocation */
>  #define request_region(start,n,name)	__request_region(&ioport_resource, (start), (n), (name))
> --- 0001/kernel/resource.c
> +++ work/kernel/resource.c	2008-07-09 12:59:41.000000000 +0900
> @@ -490,7 +490,7 @@ resource_size_t resource_alignment(struc
>  {
>  	switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) {
>  	case IORESOURCE_SIZEALIGN:
> -		return res->end - res->start + 1;
> +		return resource_size(res);
>  	case IORESOURCE_STARTALIGN:
>  		return res->start;
>  	default:
> --
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-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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