Andrew Morton wrote:
quoted text
> Well yes, but DMA_BIT_MASK(0) invokes undefined behaviour, generates a
> compiler warning and evaluates to 0xffffffffffffffff (with my setup).
>
> That won't be a problem in practice, but it is strictly wrong and doesn't set
> a good exmaple for the children ;)
>   

It's interesting that it doesn't seem to be possible to define this
without invoking some undefined behaviour.  But a device that supports 0
bits of DMA address probably isn't terribly concerned about this - it's
certainly better than making 64 bit masks warty.

    J
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