RB_RPTR_SWAP      484 drivers/gpu/drm/radeon/evergreend.h #define		RB_RPTR_SWAP(x)					((x) << 0)
RB_RPTR_SWAP      203 drivers/gpu/drm/radeon/r600d.h #define		RB_RPTR_SWAP(x)					((x) << 0)