From mboxrd@z Thu Jan  1 00:00:00 1970
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Subject: Re: [RFC/PATCH] powerpc: Use rtas query-cpu-stopped-state in smp
	spinup
From: Michael Ellerman <michael@ellerman.id.au>
To: Anton Blanchard <anton@samba.org>
In-Reply-To: <20060404124248.GA26436@krispykreme>
References: <20060404112459.C9170679EB@ozlabs.org>
	<20060404124248.GA26436@krispykreme>
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Date: Tue, 04 Apr 2006 14:46:04 +0200
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Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
	Arnd Bergmann <arnd.bergmann@de.ibm.com>
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On Tue, 2006-04-04 at 22:42 +1000, Anton Blanchard wrote:
> Hi,
>=20
> > Currently we use a cpumask called of_spin_map to keep track of which th=
reads
> > have been spun up. We basically guess that OF has spun up all even numb=
ered
> > threads, and so all the odd numbered threads need to be brought up.
> >=20
> > That's a bit of a dicey assumption at best, and is totally incorrect fo=
r
> > kexec. Luckily we have an rtas call which can tell us whether a cpu is =
up
> > or not, so let's use it?
>=20
> I have a bad feeling its broken on some older (POWER3) machines.

Ok, we'll have to see _how_ it's broken. But if it falsely reports that
the thread is started that will suck. I haven't been able to test on my
Power3 because of another breakage *cough benh cough*. I'll try it
sometime.

cheers

--=20
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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