This patch was trying to work around buggy SMM bios but causes problems
by not deasserting NMI irq line (reported by Thomas Schlicht) for some
integrated local apic.

This patch was written originally as an optimization (with the side
effect to fix those bugged bios) but was never applied to 2.4 tree.

The rational was: fix your bios instead. 

Cset exclude: akpm@osdl.org|ChangeSet|20040219045328|16041