linux-kernel - Re: [patch 1/5] x84_64, apic: Use probe routines to simplify apic selection

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Date:	Tue, 17 May 2011 15:02:32 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"steiner@....com" <steiner@....com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gorcunov@...nvz.org" <gorcunov@...nvz.org>
Subject: Re: [patch 1/5] x84_64, apic: Use probe routines to simplify apic
 selection

On Tue, 17 May 2011, Ingo Molnar wrote:
> 
> * Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> 
> > On Mon, 2011-05-16 at 01:08 -0700, Ingo Molnar wrote:
> > > Ok, looks like a step forward in the right direction.
> > > 
> > > Wouldnt it be more self-contained if the probe function returned an apic driver 
> > > pointer?
> > > 
> > > We could add an __apicdriver section trick to 'know' about all APIC probing 
> > > functions - and we'd call them one by one and use the first one that returns a 
> > > non-NULL result.
> > > 
> > > Then we'd have the generic fallback APIC drivers as well - not marked 
> > > __apicdriver but used by the probe function directly.
> > > 
> > > Or we could have them as __apicdriver as well, but then the .o link ordering 
> > > matters to probing order.
> > > 
> > 
> > So how does something like the appended look? There are multiple apic
> > driver routines and apic name string that is being looked at by the
> > generic code. So I exported the struct apic * using the section trick.
> > 
> > Untested for now. If you are ok, then I will post with a better
> > changelog.
> 
> Yeah, this looks very nice to me.

Ditto.
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