linux-kernel - Re: [RFC 8/8] x86_64: Support for new UV apic

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Message-ID: <20080326073823.GD3442@elte.hu>
Date:	Wed, 26 Mar 2008 08:38:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jack Steiner <steiner@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, tglx@...utronix.de,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 8/8] x86_64: Support for new UV apic


* Jack Steiner <steiner@....com> wrote:

> > > -        obj-y				+= genapic_64.o genapic_flat_64.o
> > > +        obj-y				+= genapic_64.o genapic_flat_64.o genx2apic_uv_x.o
> > 
> > Definitely should be a CONFIG
> 
> Not sure that I understand why. The overhead of UV is minimal & we 
> want UV enabled in all distro kernels. OTOH, small embedded systems 
> probably want to eliminate every last bit of unneeded code.
> 
> Might make sense to have a config option. Thoughts????

i wouldnt mind having UV enabled by default (it can be a config option 
but default-enabled on generic kernels so all distros will pick this hw 
support up), but we definitely need the genapic unification before we 
can add more features.

	Ingo
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