linux-kernel - Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

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Date:	Tue, 06 Mar 2007 13:32:23 -0800
From:	Dan Hecht <dhecht@...are.com>
To:	Andi Kleen <ak@...e.de>
Cc:	tglx@...utronix.de, Zachary Amsden <zach@...are.com>,
	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>
Subject: Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

On 03/06/2007 02:21 PM, Andi Kleen wrote:
>> I believe this was just a quick fix in response to Ingo breaking the VMI 
>> build yesterday by disabling NO_IDLE_HZ on us.  There is no technical 
>> reason why NO_IDLE_HZ=y can't coexist with NO_HZ.
> 
> Well it's nasty that you force NO_IDLE_HZ on all of paravirt ops users.

The only thing NO_IDLE_HZ=y "forces" on other users is some extra code 
(which you are going to get no matter what with CONFIG_PARAVIRT).   It 
doesn't force them to use this code.  It just provides a few extra 
routines that a paravirt_ops backend might want to call back into (I 
think both vmi and xen backends use these routines and that is why it 
became associated with CONFIG_PARAVIRT rather than CONFIG_VMI).
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