dma-direct: always allow dma mask <= physiscal memory size

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This way an architecture with less than 4G of RAM can support dma_mask
smaller than 32-bit without a ZONE_DMA.  Apparently that is a common
case on powerpc.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

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Christoph Hellwig 2018-09-07 09:31:58 +02:00

parent b4ebe60632

commit 9d7a224b46

1 changed files with 16 additions and 12 deletions

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kernel/dma/direct.c

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