linux-kernel - Re: x86: clean up smpboot.c's use of udelay+schedule

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Date:	Tue, 31 Jan 2012 14:01:56 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	arjanvandeven@...il.com, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86: clean up smpboot.c's use of udelay+schedule

On Tue, 2012-01-31 at 13:53 +0100, Ingo Molnar wrote:
> Wanna give a short TODO list to anyone wanting to work on that?

I paged out most details again, but it goes something like:

 - read and understand the current generic code

 - and all architecture code, at which point you'll probably boggle
   at all the similarities that are all subtly different (there's
   about 3 actually different ways in the arch code).

 - pick one, preferably one that keeps additional state and doesn't
   fully rely on the online bits and pull it into generic code and
   provide a small vector of arch specific functions.

 - convert all archs over.


Also related:

 - figure out why cpu_down needs kstopmachine, I'm not sure it does..
   we should be able to tear down a cpu using synchronize_sched() and a
   single stop_one_cpu(). (someday when there's time I might actually
   try to implement this).
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