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IXP23xx added support for dma_alloc_coherent() for DMA arches with an
exception in dma_alloc_coherent(). This is a subset of what goes on
in __dma_alloc(), and there is no reason why dma_alloc_writecombine()
should not be given the same treatment (except, maybe, that IXP23xx
doesn't use it.)
We can better deal with this by moving the arch_is_coherent() test
inside __dma_alloc() and killing the code duplication.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
ebd7a845fa