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Re: write alignment matters?

On Thu, Jun 23, 2011 at 06:36:31AM -0700, Matt Thomas wrote:
 > > That doesn't seem like it can really be right.  There are plenty of
 > > systems where devices cannot DMA from user addresses.
 > Really?  That seems unlikely.  

It's not that devices can't DMA from user addresses; it's that they
might or might not be able to DMA from an arbitrary user buffer
depending on where it happens to have been placed in the machine's
physical address space.

David A. Holland

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