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From: John Baldwin <jhb@freebsd.org>
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Date: Mon, 9 May 2011 09:35:53 -0400
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	(bigwig.baldwin.cx); Mon, 09 May 2011 09:47:07 -0400 (EDT)
Cc: current@freebsd.org, Andriy Gapon <avg@freebsd.org>
Subject: Re: COUNT_IPIS vs CPU_FOREACH
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On Saturday, May 07, 2011 5:37:26 am Andriy Gapon wrote:
> 
> I believe that the following change is needed to fix COUNT_IPIS option.
> Right now it seems to be a noop.
> 
> 
>     mp_ipi_intrcnt: CPU_FOREACH can't be used this early
> 
>     ... because all_cpus is not set yet.

Have you tested this?

all_cpus is set by start_all_aps() from cpu_mp_start() which runs at 
SI_SUB_CPU.   This SYSINIT runs later at SI_SUB_INTR.

So I think CPU_FOREACH() should be fine here.

-- 
John Baldwin