/proc and init

[Russell Coker]

During the early stages of boot /sbin/init mounts /proc so that it can check 
for the presence of SE Linux.  After it has finished doing the SE Linux stuff 
it will umount /proc.

What I want to know is, why umount /proc?  Why not just leave it mounted?

It seems a waste to umount it when you are just going to mount it again later.