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

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Message-ID: <86802c440803301323q5c4bd4f4k1f9bdc1d6b1a0a7b@mail.gmail.com>
Date:	Sun, 30 Mar 2008 13:23:12 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Jack Steiner" <steiner@....com>,
	"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

On Wed, Mar 26, 2008 at 12:38 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
>  * 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.

config option would be reasonable.
for x86_64
subarch already have X86_PC, X86_VSMP.
we have X86_UVSMP

YH
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