linux-kernel - Re: [PATCH 0/2] unify DMA_..BIT

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Date:	Tue, 18 Sep 2007 12:08:21 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Borislav Petkov <bbpetkov@...oo.de>
cc:	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Muli Ben-Yehuda <muli@...ibm.com>
Subject: Re: [PATCH 0/2] unify DMA_..BIT_MASK definitions: v2



On Tue, 18 Sep 2007, Borislav Petkov wrote:

> These patches remove redundant DMA_..BIT_MASK definitions across
> two drivers. In this version of the patches, the computation
> of the majority of the bitmasks is done by the compiler.
> 
> Signed-off-by: Borislav Petkov <bbpetkov@...oo.de>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: Muli Ben-Yehuda <muli@...ibm.com>

Just a friendly note to whoever (Jeremy?) picks up these patches --
kindly fold all three into a single git commit. No point introducing
new compile warnings to the kernel build process for no good reason
(and some archs do set -Werror in their top level Makefiles, even).


> ---
>  23-rc6/include/linux/dma-mapping.h |   23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 
> Index: b/23-rc6/include/linux/dma-mapping.h
> ===================================================================
> --- a/23-rc6/include/linux/dma-mapping.h	2007-09-17 17:48:20.000000000 +0200
> +++ b/23-rc6/include/linux/dma-mapping.h	2007-09-18 08:11:19.000000000 +0200
      ^^^^^^^^^

And whoever picks these up is gonna have trouble applying them too.

Borislav, care to have another shot at this ?

Thanks,
Satyam


> @@ -13,16 +13,19 @@
>  	DMA_NONE = 3,
>  };
>  
> -#define DMA_64BIT_MASK	0xffffffffffffffffULL
> -#define DMA_48BIT_MASK	0x0000ffffffffffffULL
> -#define DMA_40BIT_MASK	0x000000ffffffffffULL
> -#define DMA_39BIT_MASK	0x0000007fffffffffULL
> -#define DMA_32BIT_MASK	0x00000000ffffffffULL
> -#define DMA_31BIT_MASK	0x000000007fffffffULL
> -#define DMA_30BIT_MASK	0x000000003fffffffULL
> -#define DMA_29BIT_MASK	0x000000001fffffffULL
> -#define DMA_28BIT_MASK	0x000000000fffffffULL
> -#define DMA_24BIT_MASK	0x0000000000ffffffULL
> +#define DMA_BIT_MASK(n)	((1ULL<<(n))-1)
> +
> +#define DMA_64BIT_MASK	~0ULL
> +#define DMA_48BIT_MASK	DMA_BIT_MASK(48)
> +#define DMA_40BIT_MASK	DMA_BIT_MASK(40)
> +#define DMA_39BIT_MASK	DMA_BIT_MASK(39)
> +#define DMA_35BIT_MASK	DMA_BIT_MASK(35)
> +#define DMA_32BIT_MASK	DMA_BIT_MASK(32)
> +#define DMA_31BIT_MASK	DMA_BIT_MASK(31)
> +#define DMA_30BIT_MASK	DMA_BIT_MASK(30)
> +#define DMA_29BIT_MASK	DMA_BIT_MASK(29)
> +#define DMA_28BIT_MASK	DMA_BIT_MASK(28)
> +#define DMA_24BIT_MASK	DMA_BIT_MASK(24)
>  
>  static inline int valid_dma_direction(int dma_direction)
>  {
-
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