tree 63f302e25ba7a0705bbf051f3817fac8f8b98aba
parent 7686ad5606f08d9dfb33a2087a36c8366366015b
author Manfred Spraul <manfred@colorfullife.com> 1220799442 +0200
committer Ingo Molnar <mingo@elte.hu> 1220894724 +0200

kernel/cpu.c: create a CPU_STARTING cpu_chain notifier

Right now, there is no notifier that is called on a new cpu, before the new
cpu begins processing interrupts/softirqs.
Various kernel function would need that notification, e.g. kvm works around
by calling smp_call_function_single(), rcu polls cpu_online_map.

The patch adds a CPU_STARTING notification. It also adds a helper function
that sends the message to all cpu_chain handlers.

Tested on x86-64.
All other archs are untested. Especially on sparc, I'm not sure if I got
it right.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>