Linux 2.6.21-rc2

Too many changes for comfort since -rc1.  Some missed merges, and some
just annoyingly big fixes since.  This is not how an -rc2 should look.
Need to really calm things down!

Makefile

 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 21
-EXTRAVERSION = -rc1
+EXTRAVERSION = -rc2
 NAME = Homicidal Dwarf Hamster
 
 # *DOCUMENTATION*