It looks to be impossible to create a kerneltrap account.
http://kerneltrap.org/user/create acts like it's only checking
entries against existing users, and http://kerneltrap.org/user/register
just displays a page which says "Access denied You are not authorized
to access this page."
The "why no register" thread in the feedback forum,
seem to imply one of these should work.
What's up with this?