dma-mapping: update the old macro DMA_nBIT_MASK related documentations
Update the old macro DMA_nBIT_MASK related documentations Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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