From: Andi Kleen <ak@suse.de>,
      From Suresh.B.Siddha

Fix another bug caused by the recent IA32e merge.  The full L1 cache size
padding of the GDT didn't work with smaller cache line sizes.  Just revert
that.

I must admit I still don't understand why it didn't work, but it's better
to have a working system for now.