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Use semaphores to sync buffers across rings in the CS ioctl. Add a reloc flag to allow userspace to skip sync for buffers. agd5f: port to latest CS ioctl changes. v2: add ring lock/unlock to make sure changes hit the ring. Signed-off-by: Christian König <[email protected]> Signed-off-by: Alex Deucher <[email protected]> Signed-off-by: Dave Airlie <[email protected]>