powerpc/warp: Fix ISA_DMA_THRESHOLD default
If no device is passed to __dma_alloc_coherent, it defaults to using ISA_DMA_THRESHOLD for the mask. This patch provides a reasonable default rather than 0. Signed-off-by: NSean MacLennan <smaclennan@pikatech.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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