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Draft: uio: introduce UIO_MEM_DMA_COHERENT type

John Meneghini requested to merge johnmeneghini/centos-stream-9:uio_mem_dma_coherent into main

JIRA: https://issues.redhat.com/browse/RHEL-18335

Add a UIO memtype specifically for sharing dma_alloc_coherent memory with userspace, backed by dma_mmap_coherent.

Signed-off-by: John Meneghini jmeneghi@redhat.com

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