From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@zip.com.au>
Date: Mon, 05 Aug 2002 04:33:31 +0000
Subject: Re: [Linux-ia64] Re: CPU hotplug boot change for IA64
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To: linux-ia64@vger.kernel.org

Rusty Russell wrote:
> 
> In message <20020802210541.0AB4.K-SUGANUMA@mvj.biglobe.ne.jp> you write:
> > Hi Rusty,
> >
> > On Sat, 03 Aug 2002 13:29:02 +1000
> > Rusty Russell <rusty@rustcorp.com.au> wrote:
> >
> > > > Rusty, I guess this modification should be needed for i386, too.
> > >
> > > You should *not* be calling smp_call_function before smp_prepare_cpus.
> > >
> > > I know kgdb can do this, but it's a special case.
> >
> > OK.
> > I cannot remember who was calling smp_call_function, but I think
> > it might be kdb. I'm using kdb for debugging in usual.
> 
> Yes, in which case the fix I asked Andrew Morton to use was:
> 
>         /* Before smp_prepare_cpus, cpu_online not usable */
>         if (num_online_cpus() > 1)
>                 smp_call_function(...)

It works, too.  http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.30/kgdb.patch