PVR_DEVICE_PAGE_MASK
if ((op_ctx->map.sgt_offset | size) & ~PVR_DEVICE_PAGE_MASK)
if ((op->map.gem.offset | op->map.va.range) & ~PVR_DEVICE_PAGE_MASK)
(device_addr & ~PVR_DEVICE_PAGE_MASK) == 0;
size != 0 && (size & ~PVR_DEVICE_PAGE_MASK) == 0 &&