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

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Date:	Sat, 6 Oct 2007 09:54:15 +0200
From:	Borislav Petkov <bbpetkov@...oo.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Robert P. J. Day" <rpjday@...dspring.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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

On Fri, Oct 05, 2007 at 02:23:41PM -0700, Jeremy Fitzhardinge wrote:
> 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".
... and ULLONG_MAX _is_ (~0ULL).

-- 
Regards/Gruß,
    Boris.
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