I'm getting this when loading an externally built module:
infinity: Unknown symbol vsyscall_end
infinity: Unknown symbol vsyscall_ehdr
The module uses copy_from_user(). When ARCH=um, copy_from_user() is defined as inline, and uses FIXADDR_USER_END. That macro is defined as VSYSCALL_END, which in turn is defined as vsyscall_end. However, there's no EXPORT_SYMBOL(vsyscall_end).
This is in linux-2.6.16-rc4, with Jeff's patch set from last week.