| Message ID | 20200831184859.110660-2-leobras.c@gmail.com (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
| Series | DMA pagecache | expand |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | success | Successfully applied on branch powerpc/merge (f5d3660ab83be7c3dc2c8a5d662bbac7bc1b092f) |
| snowpatch_ozlabs/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 7 lines checked |
| snowpatch_ozlabs/needsstable | success | Patch has no Fixes tags |
diff --git a/include/linux/dma-direction.h b/include/linux/dma-direction.h index 9c96e30e6a0b..caf3943a21f4 100644 --- a/include/linux/dma-direction.h +++ b/include/linux/dma-direction.h @@ -9,4 +9,7 @@ enum dma_data_direction { DMA_NONE = 3, }; +/* Checks if wanted direction is satisfied by current mapping direction*/ +#define DMA_DIR_COMPAT(current, wanted) (((current) & ~(wanted)) == 0) + #endif
Given a existing mapping with 'current' direction, and a 'wanted' direction for using that mapping, check if 'wanted' is satisfied by 'current'. current accepts DMA_BIDIRECTIONAL DMA_BIDIRECTIONAL, DMA_TO_DEVICE, DMA_FROM_DEVICE, DMA_NONE DMA_TO_DEVICE DMA_TO_DEVICE, DMA_NONE DMA_FROM_DEVICE DMA_FROM_DEVICE, DMA_NONE DMA_NONE DMA_NONE This macro is useful for checking if a DMA mapping can be reused. Signed-off-by: Leonardo Bras <leobras.c@gmail.com> --- include/linux/dma-direction.h | 3 +++ 1 file changed, 3 insertions(+)