linux-kernel - Re: [PATCH] kernel: add bit rotation helpers for 16 and 8 bit

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Date:	Tue, 18 Mar 2008 13:32:28 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Harvey Harrison <harvey.harrison@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [PATCH] kernel: add bit rotation helpers for 16 and 8 bit

Harvey Harrison wrote:
> Will replace open-coded variants elsewhere.  Done in the same
> style as the 32-bit versions.
> 
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> ---
> Andrew, these will be used to replace some open-coded variants in the
> mac80211 code, there are currently no users so it can go in with little
> risk.
> 
> Randy, CC'd in case I screwed up the kerneldoc.

Looks good.
Acked-by: Randy Dunlap <randy.dunlap@...cle.com>


>  include/linux/bitops.h |   40 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 40 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/bitops.h b/include/linux/bitops.h
> index 69c1edb..40d5473 100644
> --- a/include/linux/bitops.h
> +++ b/include/linux/bitops.h
> @@ -65,6 +65,46 @@ static inline __u32 ror32(__u32 word, unsigned int shift)
>  	return (word >> shift) | (word << (32 - shift));
>  }
>  
> +/**
> + * rol16 - rotate a 16-bit value left
> + * @word: value to rotate
> + * @shift: bits to roll
> + */
> +static inline __u16 rol16(__u16 word, unsigned int shift)
> +{
> +	return (word << shift) | (word >> (16 - shift));
> +}
> +
> +/**
> + * ror16 - rotate a 16-bit value right
> + * @word: value to rotate
> + * @shift: bits to roll
> + */
> +static inline __u16 ror16(__u16 word, unsigned int shift)
> +{
> +	return (word >> shift) | (word << (16 - shift));
> +}
> +
> +/**
> + * rol8 - rotate an 8-bit value left
> + * @word: value to rotate
> + * @shift: bits to roll
> + */
> +static inline __u8 rol8(__u8 word, unsigned int shift)
> +{
> +	return (word << shift) | (word >> (8 - shift));
> +}
> +
> +/**
> + * ror8 - rotate an 8-bit value right
> + * @word: value to rotate
> + * @shift: bits to roll
> + */
> +static inline __u8 ror8(__u8 word, unsigned int shift)
> +{
> +	return (word >> shift) | (word << (8 - shift));
> +}
> +
>  static inline unsigned fls_long(unsigned long l)
>  {
>  	if (sizeof(l) == 4)


-- 
~Randy
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