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

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Date:	Mon, 17 Sep 2007 11:48:54 -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:
> That is more compact, I agree. However, the XXBIT_MASK macros have the
> better readability, imho. And also, doing 
>
> $grep -Prin 'DMA_..BIT_MASK' * | wc -l
>
> returns 383 on the 23-rc6 tree so removing them should be quite the logistical
> challenge for the kernel janitors :). What do the others think?
>   

Well, even defining the existing macros in terms of DMA_BIT_MASK would
be an improvement.  It's certainly not obvious at first glance that
0x00000007ffffffffULL is a correct 35-bit mask - it's something that the
compiler is perfectly happy to compute for us.

    J
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