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dma_alloc_coherent is an opaque allocator that only uses the GFP_ flags
for allocation context control.  Don't pass __GFP_COMP which makes no
sense for an allocation that can't in any way be converted to a page
pointer.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Wenjia Zhang <wenjia@linux.ibm.com>