linux-kernel - Re: [PATCH] ata: replace macro with static inline in libata.h

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Date:	Wed, 20 Feb 2008 12:16:35 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Harvey Harrison <harvey.harrison@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ata: replace macro with static inline in libata.h

Harvey Harrison wrote:
> Avoid ~70 sparse warnings like:
> drivers/ata/pata_ali.c:176:14: warning: symbol '__x' shadows an earlier one
> drivers/ata/pata_ali.c:176:14: originally declared here
> 
> Due to nesting min_t macro inside max_t macro which both use a __x
> identifier internally.
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> ---
> Andrew, here is a patch that drastically reduces the number of sparse
> warnings in libata.  Alan Cox has suggested a clamp_t macro be added
> to kernel.h instead to avoid this issue.  I don't believe Jeff Garzik
> has given an opinion yet (other than not applying it when originally
> sent this was 5/11 of the libata sparse warnings)
> 
>  include/linux/libata.h |    9 ++++++++-
>  1 files changed, 8 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/libata.h b/include/linux/libata.h
> index bc5a8d0..b5590fb 100644
> --- a/include/linux/libata.h
> +++ b/include/linux/libata.h
> @@ -764,7 +764,14 @@ struct ata_timing {
>  	unsigned short udma;		/* t2CYCTYP/2 */
>  };
>  
> -#define FIT(v, vmin, vmax)	max_t(short, min_t(short, v, vmax), vmin)
> +static inline short FIT(short v, short vmin, short vmax)
> +{
> +	if (v >= vmax)
> +		return vmax;
> +	if (v <= vmin)
> +		return vmin;
> +	return v;
> +}

I agree with Alan...


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