From: Justin M. Forbes on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1498#note_7387...
There are plenty of configs in tree which do not show up to us because they
are dependent upon other config items which are not set. In the case of
ARM64_FORCE_52BIT it depends on: CONFIG_ARM64_VA_BITS_52 && CONFIG_EXPERT. We
do not and likely will not ever set CONFIG_EXPERT as that opens a massive can
of worms (I tried this several months ago). We tend to patch out the
CONFIG_EXPERT dependency if we want to flip something that depends on it.