Most of them are unsafe despite not being marked as such. For example fn __init and fn __exit contain unsynchronized accesses to static mut __MOD. There are also several extern "C" functions which call __init and __exit. These need to be marked as unsafe too.

cc https://rust-for-linux.zulipchat.com/#narrow/stream/288089-General/topic/patch.20v3.20review/near/268298086