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由 Mika Westerberg 提交于
This is needed when Thunderbolt service drivers need to DMA map memory before it is passed down to the ring. Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: NMichael Jamet <michael.jamet@intel.com> Reviewed-by: NYehezkel Bernat <yehezkel.bernat@intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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