linux-kernel - Re: [BISECTION RESULT] sched: revert cpu_clock to pre-27ec4407790d075c325e1f4da0a19c56953cce23 state

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Message-Id: <20080804.150249.71509974.davem@davemloft.net>
Date:	Mon, 04 Aug 2008 15:02:49 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tony.luck@...el.com
Cc:	nacc@...ibm.com, mingo@...e.hu, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BISECTION RESULT] sched: revert cpu_clock to
 pre-27ec4407790d075c325e1f4da0a19c56953cce23 state

From: "Luck, Tony" <tony.luck@...el.com>
Date: Mon, 4 Aug 2008 15:00:47 -0700

> > I'd bet resonable sums of money that we are (once again) accessing
> > per-cpu variables in code before ia64 has a chance to initialize
> > things so that they can actually work. :-(
> 
> I tried this simple hack to check ... per-cpu variables are
> not usable until cpu_init() sets up the "ar.k3" register on
> ia64.  So this hack checks to see if it is set before calling
> cpu_clock():

Can you guys on IA64 possibly set ar.k3 simply to zero or to some
other similar value which cancels out the per-cpu computation?

That's what sparc64 and other platforms do.
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