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PowerPC currently doesn't implement pci_set_dma_mask(), which means drivers calling it will get the generic version in drivers/pci/pci.c. The powerpc dma mapping ops include a dma_set_mask() hook, which luckily is not implemented by anyone - so there is no bug in the fact that the hook is currently never called. However in future we'll add implementation(s) of dma_set_mask(), and so we need pci_set_dma_mask() to call the hook. To save adding a hook to the dma mapping ops, pci-set_consistent_dma_mask() simply calls the dma_set_mask() hook and then copies the new mask into dev.coherenet_dma_mask. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>