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

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Date:	Wed, 07 Mar 2007 23:31:53 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Zachary Amsden <zach@...are.com>
Cc:	Dan Hecht <dhecht@...are.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	ak@...e.de,
	Virtualization Mailing List <virtualization@...ts.osdl.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 Wed, 2007-03-07 at 14:17 -0800, Zachary Amsden wrote:
> Thomas Gleixner wrote:
> > Simply because you _ABUSE_ timer_init_hook() to set it up. Keep it self
> > contained and do not impose restrictions on the kernel core code, which
> > we have to maintain.
> >   
> 
> But time_init_hook is supposed to be abused.  That is its purpose - to 
> be a hook for different time devices on SGI Visual Workstation and 
> Voyager.  And we don't actually abuse it anymore, we just bypass it 
> because the default timer init path wants to setup the PIT or the HPET, 
> neither of which should be used in paravirt.

It is there for those hardware platforms, but using it inside your clock
event device is _JUST_ wrong.

Please make these things self contained and not relying on whatever
time_init_hook() contains.

	tglx


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