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Date: Mon, 17 Sep 2007 11:14:48 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: bbpetkov@...oo.de
CC: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] unify DMA_..BIT_MASK definitions
Borislav Petkov wrote:
> This patches remove redundant DMA_..BIT_MASK definitions across two drivers.
> First off, consolidate dma bitmask definitions in the proper header file...
>
> Signed-off-by: Borislav Petkov <bbpetkov@...oo.de>
>
> --
> Index: 23-rc6/include/linux/dma-mapping.h
> ===================================================================
> --- 23-rc6/include/linux/dma-mapping.h.orig 2007-09-17 17:48:20.000000000 +0200
> +++ 23-rc6/include/linux/dma-mapping.h 2007-09-17 19:34:21.000000000 +0200
> @@ -17,6 +17,7 @@
> #define DMA_48BIT_MASK 0x0000ffffffffffffULL
> #define DMA_40BIT_MASK 0x000000ffffffffffULL
> #define DMA_39BIT_MASK 0x0000007fffffffffULL
> +#define DMA_35BIT_MASK 0x00000007ffffffffULL
> #define DMA_32BIT_MASK 0x00000000ffffffffULL
> #define DMA_31BIT_MASK 0x000000007fffffffULL
> #define DMA_30BIT_MASK 0x000000003fffffffULL
>
Hm. Wouldn't it be better to define something like
#define DMA_BIT_MASK(x) ((1ull<<(x))-1)
and then define everything in terms of that (or just use it directly and
deprecate the DMA_XXBIT_MASK macros)?
J
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