K 10
svn:author
V 10
nwhitehorn
K 8
svn:date
V 27
2010-03-09T02:00:53.842660Z
K 7
svn:log
V 379
Place interrupt handling in a critical section and remove double
counting in incrementing the interrupt nesting level. This fixes a number
of bugs in which the interrupt thread could be preempted by an IPI,
indefinitely delaying acknowledgement of the interrupt to the PIC, causing
interrupt starvation and hangs.

Reported by:	linimon
Reviewed by:	marcel, jhb
MFC after:	1 week

END