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kernel/cpu.c: create a CPU_STARTING cpu_chain notifier

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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>
This commit is contained in:
Manfred Spraul
2008-09-07 16:57:22 +02:00
committed by Ingo Molnar
parent 7686ad5606
commit e545a6140b
17 changed files with 51 additions and 1 deletions
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1
arch/ia64/kernel/smpboot.c
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@@ -401,6 +401,7 @@ smp_callin (void)
spin_lock(&vector_lock);
/* Setup the per cpu irq handling data structures */
__setup_vector_irq(cpuid);
notify_cpu_starting(cpuid);
cpu_set(cpuid, cpu_online_map);
per_cpu(cpu_state, cpuid) = CPU_ONLINE;
spin_unlock(&vector_lock);