BUILD_BUG_ON_NOT_POWER_OF_2
BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE);
BUILD_BUG_ON_NOT_POWER_OF_2(KSYNCMAP);
BUILD_BUG_ON_NOT_POWER_OF_2(SHIFT);
BUILD_BUG_ON_NOT_POWER_OF_2(execlists_num_ports(execlists));