Re: [PATCH 1/1] unify DMA_..BIT_MASK definitions: v3.1

Borislav Petkov
2007-10-06T08:04:57Z

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.