linux-kernel - Re: [KJ][PATCH] BIT macro cleanup

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Date:	Thu, 29 Mar 2007 05:48:14 +0200
From:	Richard Knutsson <ricknu-0@...dent.ltu.se>
To:	Milind Arun Choudhary <milindchoudhary@...il.com>
CC:	kernel-janitors@...ts.osdl.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [KJ][PATCH] BIT macro cleanup

Milind Arun Choudhary wrote:
> BIT macro cleanup,now in bitops.h
>
> Signed-off-by: Milind Arun Choudhary <milindchoudhary@...il.com>
>
> ---
>   
<snip>
> diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
> index 0de0c65..5aa3be5 100644
> --- a/drivers/net/s2io.h
> +++ b/drivers/net/s2io.h
> @@ -14,6 +14,7 @@
>  #define _S2IO_H
>  
>  #define TBD 0
> +#undef BIT
>  #define BIT(loc)		(0x8000000000000000ULL >> (loc))
>  #define vBIT(val, loc, sz)	(((u64)val) << (64-loc-sz))
>  #define INV(d)  ((d&0xff)<<24) | (((d>>8)&0xff)<<16) | (((d>>16)&0xff)<<8)| ((d>>24)&0xff)
>   
Why not use "LLBIT(63 - loc)" instead?

Richard Knutsson

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