> So far, it looks like this will be a major undertaking. Whoever was responsible for the namespace support is going to have to rebase the entire dang thing with alternate code paths for everything, because as of Linux 6.3, they replaced a whole mess of APIs so they either newly accept struct mnt_idmap * instead of struct user_namespace *, or accept the former in addition to the previous parameters. This has far reaching implications, I think. Good luck to whoever attempts the task.
ouch