Re: [PATCH][1/3] ppc32: add 440ep support
From: Andrew Morton
Date: Wed Jul 27 2005 - 18:38:28 EST
Paul Mackerras <paulus@xxxxxxxxx> wrote:
> Andrew Morton writes:
> > Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > +static u64 dma_mask = 0xffffffffULL;
> > I'm sure you're totally uninterested in this, but the above will probably
> > generate warnings on (say) ppc64, where u64 is implemented as unsigned
> > long.
> > I usually chuck a simple `-1' in there and the compiler always gets it
> > right, regardless of signedness and size and architecture.
> Umm, I think we actually want 2^32-1 not -1, don't we?
Doh. Cant coun't.
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