Re: [RFC, PATCH] Add a CPU_STARTING notifier (was: Re: [PATCH, RFC] v4 scalable classic RCU implementation)

[Andi Kleen]

> What about introducing a CPU_STARTING notifier call, similar to CPU_DYING:
> - called with disabled interrupts
> - called before interrupts are enabled
> - must not sleep
> - called on the new cpu.
> 
> This might also be useful for something like kvm. I'm not sure if it's 
> guaranteed that hardware_enable() runs early enough.

I would find that useful too. I had several cases where i had 
to add smp_call_function_single() with a second callback to the CPU_UP 
notifier, which always seemed ugly.

-Andi
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