linux-kernel - Re: remove cpu hotplug bustification in cpufreq.

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Date:	Sat, 22 Jul 2006 22:34:25 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	davej@...hat.com, linux-kernel@...r.kernel.org,
	ashok.raj@...el.com, Ingo Molnar <mingo@...e.hu>
Subject: Re: remove cpu hotplug bustification in cpufreq.

On Sat, 22 Jul 2006 18:15:32 -0700 (PDT)
Linus Torvalds <torvalds@...l.org> wrote:

> 
> 
> On Sat, 22 Jul 2006, Andrew Morton wrote:
> > 
> > It was just wrong in conception.  We should not and probably cannot fix it.
> > Let's just delete it all, then implement version 2.
> 
> Well, I just got Ashok's trial patches which turns the thing into a rwsem 
> as I outlined earlier.

Mark my words ;)

> I'll try them out. If they don't work, we should just delete the lock and 
> go totally back to square 1.

rwsem conversion has the potential to merely hide the problem.  Ingo, does
lockdep detect recursive down_read()?
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