WARNING: CONFIG_WATCHDOG_NOWAYOUT is invalid
It is unset
Allowed values : y, !
Comment says: If device uses watchdogs with dsme (https://github.com/sailfishos/dsme), this option should be enabled or watchdog does not protect the device in case dsme crashes.

WARNING: CONFIG_RTC_DRV_CMOS is invalid
It is unset
Allowed values : y, !
Comment says: optional, but highly recommended, not available on arm64

WARNING: CONFIG_MEMCG_KMEM is invalid
It is unset
Allowed values : y, !, >=3.6
Comment says: systemd (optional, but recommended): https://github.com/systemd/systemd/blob/v238/README, only valid if kernel version >= 3.6

WARNING: CONFIG_SECURITY_YAMA_STACKED is invalid
It is unset
Allowed values : y, !, <4.3
Comment says: optional, only valid for kernel < 4.3

WARNING: CONFIG_LBDAF is invalid
It is unset
Allowed values : y, !
Comment says: ext4 filesystem requires this in order to support filesysetms with huge_file feature, which is enabled by default by mke2fs.ext4, not needed for 64bit architectures