Re: ensure dma_alloc_coherent always returns zeroed memory

[Christoph Hellwig <hch@xxxxxx>]

And in various places this used GFP_ZERO instead of __GFP_ZERO,
so won't compile.

The fixed version is available here:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-alloc-always-zero