MEMBARRIER_CMD_QUERY 0 MEMBARRIER_CMD_GLOBAL 1 << 0 MEMBARRIER_CMD_GLOBAL_EXPEDITED 1 << 1 MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED 1 << 2 MEMBARRIER_CMD_PRIVATE_EXPEDITED 1 << 3 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED 1 << 4 MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE 1 << 5 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE 1 << 6