Messages in this thread |  | | | Date | Thu, 28 Jul 2005 15:02:19 +0200 | | From | Domen Puncer <> | | Subject | Re: [PATCH][1/3] ppc32: add 440ep support |
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On 27/07/05 18:56 -0400, Paul Mackerras wrote: > Andrew Morton writes: > > > Matt Porter <mporter@kernel.crashing.org> wrote: > > > > > > +static u64 dma_mask = 0xffffffffULL;
How about just DMA_32BIT_MASK from dma-mapping.h, that one has to be correct. ;-)
> > > > 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? In which case > I think Matt's code is what we have to have. > > I tried a little test compile with gcc 4.0 with -m64 -Wall and it > didn't generate a warning with the 0xffffffffULL constant. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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