this is the -A4 merge of the 2.5-current scheduler, against
2.4.19-pre10-ac2. Changes relative to -A3:

 - export idle_cpu() and idle_task() as suggested by J.A. Magallon.

 - fix sync wakeup() to not set affinity unconditionally.

 - comment & cleanup merges.

The patch can also be downloaded from:

    http://redhat.com/~mingo/O(1)-scheduler/sched-2.4.19-pre10-ac2-A4

(the patch was test-compiled and test-booted on x86 UP and SMP boxes.)

Comments?

	Ingo