linux-kernel - Re: [PATCH 1/1] unify DMA_..BIT

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Date:	Fri, 05 Oct 2007 14:23:41 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, bbpetkov@...oo.de,
	linux-kernel@...r.kernel.org, muli@...ibm.com,
	satyam@...radead.org, amitkale@...xen.com,
	achim_leubner@...ptec.com
Subject: Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1

Robert P. J. Day wrote:
> or you could take advantage of the macros in kernel.h and write that
> as:
>
> +#define DMA_BIT_MASK(n)      (((n) == 64) ? ULLONG_MAX : ((1ULL<<(n))-1))
>   

But that's a more indirect way of expressing "I want all 1's".

    J
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