On Mon, 2007-02-05 at 19:30 +0100, Johannes Berg wrote:

This patch allows "hotplugging" of CPUs on G5 machines. CPUs that are
disabled are put into an idle loop with interrupts hard-disabled, to wake
them up again we kick them just like when bringing them up.

testing with forced preemption revealed that the preempt count is messed
up. Will resend with the fix. The hardirq count is still strange...

johannes