CONFIG_DEVTMPFS
CONFIG_CGROUPS                          (it is allowed to disable all controllers but some optional statistics-gathering capability will be lost)
CONFIG_INOTIFY_USER
CONFIG_SIGNALFD
CONFIG_TIMERFD
CONFIG_EPOLL
CONFIG_NET
CONFIG_SYSFS
CONFIG_PROC_FS
CONFIG_FHANDLE
CONFIG_CRYPTO_USER_API_HASH
CONFIG_CRYPTO_HMAC
CONFIG_CRYPTO_SHA256
CONFIG_SYSFS_DEPRECATED=n
CONFIG_UEVENT_HELPER_PATH=""
CONFIG_FW_LOADER_USER_HELPER=n
CONFIG_DMIID                            (if applicable to your target system)
CONFIG_BLK_DEV_BSG                      additional symlinks in /dev/disk/ and /dev/tape for SCSI
CONFIG_NET_NS
CONFIG_DEVPTS_MULTIPLE_INSTANCES        (n/a for kernel 4.9 or higher)
CONFIG_USER_NS                          for PrivateUsers=
CONFIG_IPV6                             "Optional but strongly recommended"
CONFIG_AUTOFS4_FS                       "Optional but strongly recommended"
CONFIG_TMPFS_XATTR                      "Optional but strongly recommended"
CONFIG_TMPFS_POSIX_ACL                  "Optional but strongly recommended"
CONFIG_EXT4_POSIX_ACL                   "Optional but strongly recommended"
CONFIG_SECCOMP                          "Optional but strongly recommended"
CONFIG_SECCOMP_FILTER                   "Optional but strongly recommended"
CONFIG_CHECKPOINT_RESTORE               "Optional but strongly recommended"
CONFIG_CGROUP_SCHED                     for CPUShares=
CONFIG_FAIR_GROUP_SCHED                 for CPUShares=
CONFIG_CFS_BANDWIDTH                    for CPUQuota=
CONFIG_RT_GROUP_SCHED=n                 unless you know what you're doing