linux-kernel - Re: [patch-mm 00/28] High resolution timer updates and x86_64 support

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Date:	Thu, 28 Jun 2007 03:39:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <ak@...e.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	John Stultz <johnstul@...ibm.com>,
	Chris Wright <chrisw@...s-sol.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch-mm 00/28] High resolution timer updates and x86_64
 support - V3

On Thu, 28 Jun 2007 11:47:04 +0200 Andi Kleen <ak@...e.de> wrote:

> On Thursday 28 June 2007 11:42:33 Andrew Morton wrote:
> 
> > > The patch set has been tested in the -hrt and -rt trees for quite a while
> > > and the initial problems have been sorted out. Thanks to the folks from the
> > > PowerTop project for testing and feedback.
> > 
> > hrm.  Looks like none of your testers have HPET_ID_LEGSUP hardware.  
> 
> AFAIK it's only on IBM Summit. You have such a box?

Intel Nocona SDV thing.  Old.

> > btw, if you want to know why I go on and on about crappy commenting, try to
> > work out from the kernel source code what HPET_ID_LEGSUP is, and why it
> > gets special treatment.  It is not possible.  This is not maintainable
> > code.
> 
> We have a reference somewhere to the HPET spec.

The HPET spec won't tell me why HPET_ID_LEGSUP hpets get a kmalloc in Linux
but the !HPET_ID_LEGSUP ones don't.

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