NVME_IOPOLICY_NUMA
if (head->subsys->iopolicy != NVME_IOPOLICY_NUMA)
READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA)
[NVME_IOPOLICY_NUMA] = "numa",
static int iopolicy = NVME_IOPOLICY_NUMA;