On Tue, Apr 24, 2018 at 11:54:26PM -0700, David Rientjes wrote: > Shouldn't that test for dev->coherent_dma_mask < DMA_BIT_MASK(32) be more > accurately <=?
No, it should really be <. The exactly 32-bit case is already covered with GFP_DMA32. Eventualy it should be < 24-bit with a separate GFP_DMA32 case for > 32-bit && < 64-bit. Takashi has been working on that, but it is 4.18 material.
