out-of-tree driver.
Who: Thomas Gleixner <tglx@linutronix.de>
+----------------------------
+
+What: usedac i386 kernel parameter
+When: 2.6.27
+Why: replaced by allowdac and no dac combination
+Who: Glauber Costa <gcosta@redhat.com>
+
---------------------------
What: /sys/o2cb symlink