By default GNU ld and GNU gold allow relocations in the read-only text segment, and lld does not.

For kernel modules I think it's fine, and so we can just enable this universally, but please let me know if we shouldn't.

Description of these options, from ld.gold's help text:

-z text                     Do not permit relocations in read-only segments
-z notext                   Permit relocations in read-only segments (default)

GNU ld 2.17.50 does not document -z text or -z notext but does claim that "Other [-z] keywords are ignored".