l2cr missing from /proc

Why is l2cr missing from the /proc filesystem in recent 2.6 kernels?
Is it a bug or design decision?

It wasn't necessary since one could set it via a kernel arg however
now that I'm trying to turn on cache in a 7455 and setting l3cr isn't
supported from the command line I was wondering if l3cr was in /proc
as well but has also gone missing (since I see l3cr code in the kernel
source).