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From: Anton Blanchard <anton@samba.org>
To: Michael Ellerman <michael@ellerman.id.au>
Cc: linuxppc-dev@ozlabs.org, Paul Mackerras <paulus@samba.org>,
	Arnd Bergmann <arnd.bergmann@de.ibm.com>
Subject: Re: [RFC/PATCH] powerpc: Use rtas query-cpu-stopped-state in smp spinup
Date: Tue, 4 Apr 2006 22:42:48 +1000	[thread overview]
Message-ID: <20060404124248.GA26436@krispykreme> (raw)
In-Reply-To: <20060404112459.C9170679EB@ozlabs.org>


Hi,

> Currently we use a cpumask called of_spin_map to keep track of which threads
> have been spun up. We basically guess that OF has spun up all even numbered
> threads, and so all the odd numbered threads need to be brought up.
> 
> That's a bit of a dicey assumption at best, and is totally incorrect for
> kexec. Luckily we have an rtas call which can tell us whether a cpu is up
> or not, so let's use it?

I have a bad feeling its broken on some older (POWER3) machines.

Anton

  reply	other threads:[~2006-04-04 12:42 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-04 11:24 [RFC/PATCH] powerpc: Use rtas query-cpu-stopped-state in smp spinup Michael Ellerman
2006-04-04 12:42 ` Anton Blanchard [this message]
2006-04-04 12:46   ` Michael Ellerman
2006-04-04 17:25 ` Nathan Lynch
2006-04-05 11:23   ` Michael Ellerman
2006-04-07  1:10     ` Nathan Lynch
2006-04-11  8:53       ` Michael Ellerman

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