linux-kernel - Re: x86: unify genapic code, unify subarchitectures, remove old subarchitecture code

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Date:	Fri, 30 Jan 2009 00:27:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tim Pepper <lnxninja@...ux.vnet.ibm.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86: unify genapic code, unify subarchitectures, remove old
	subarchitecture code


* Tim Pepper <lnxninja@...ux.vnet.ibm.com> wrote:

> On Thu, Jan 29, 2009 at 2:14 PM, Ingo Molnar <mingo@...e.hu> wrote:

> > At this point there's no technical need to kill it - it's a 
> > zero-overhead thing tucked away into a single .c module in 
> > arch/x86/kernel/numaq_32.c. I even consolidated most of its headers in 
> > that file, to reduce its cross section.
> 
> Wish we'd have piped up earlier to save you a bit of work.

Well bigsmp wasnt going to go away anytime soon so the de-subarching and 
unification work had to be done anyway. NUMAQ came along for the ride ;-) 
I've got some more restructuring plans in this area so the time was well 
spent in any case.

> We can make the NUMAQ's beep still, if not boot.  :)
> 
> Reality is they're just not worth the effort any more and there's no 
> sign of anybody else having them.  Assuming your code goes in for 2.6.30 
> it'll be easy to drop NUMAQ support.  Even if there's not much downside 
> there's also not much reason to leave it in but marked 
> deprecated/broken.

Yes, unless there's major stability problems with the x86/apic branch 
we'll merge it into v2.6.30. NUMAQ is a single .c module now 
(default-disabled) so not much of a concern.

	Ingo
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