linux-kernel - Re: [PATCH] x86: add apic probe for genapic 64bit v2

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Date:	Tue, 22 Jul 2008 10:24:10 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Paul Jackson <pj@....com>, Mike Travis <travis@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: add apic probe for genapic 64bit v2


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> On Tue, Jul 22, 2008 at 12:13 AM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> > * Ingo Molnar <mingo@...e.hu> wrote:
> >
> >> > v2: fix compiling when CONFIG_ACPI is not set
> >>
> >> applied to tip/x86/x2apic - thanks Yinghai.
> >>
> >> > +static struct genapic *apic_probe[] __initdata = {
> >> > +   &apic_x2apic_uv_x,
> >> > +   &apic_x2apic_phys,
> >> > +   &apic_x2apic_cluster,
> >> > +   &apic_physflat,
> >> > +   NULL,
> >> > +};
> >>
> >> very nice generalization!
> >
> > btw.:
> >
> >   apic_probe[i]->acpi_madt_oem_check
> >
> > should probably be renamed to something more neutral like "->probe" -
> > there's nothing ACPI about it and some weird boxes could use PCI or
> > other probing mechanisms to discover the type of APIC they want to use.
> 
> 32bit has acpi_madt_oem_check and mps_oem_check
> 64bit should only have acpi_madt_oem_check

yeah.

It's just a small detail: what i mean is that the method itself should 
eventually simply be renamed from "acpi_madt_oem_check" to "probe". 
There's nothing ACPI about this exept the fact that most current "is 
this the APIC driver we should be using" checks involve some sort of 
ACPI discovery. This is a Linux abstraction and as such a more generic 
name like "probe" sounds more appropriate.

	Ingo
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