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

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Message-ID: <20110516080844.GC27635@elte.hu>
Date:	Mon, 16 May 2011 10:08:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	tglx@...utronix.de, hpa@...or.com, steiner@....com,
	yinghai@...nel.org, linux-kernel@...r.kernel.org,
	gorcunov@...nvz.org
Subject: Re: [patch 1/5] x84_64, apic: Use probe routines to simplify apic
 selection


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> From: Suresh Siddha <suresh.b.siddha@...el.com>
> Subject: x84_64, apic: Use probe routines to simplify apic selection
> 
> Use the unused probe routine in the apic driver to finalize the apic model
> selection. This cleans up the default_setup_apic_routing() and this probe
> routine in future can also be used for doing any apic model specific
> initialization.
> 
> Acked-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> ---
>  arch/x86/kernel/apic/apic_flat_64.c   |   10 +++++++++-
>  arch/x86/kernel/apic/probe_64.c       |   22 +++++++---------------
>  arch/x86/kernel/apic/x2apic_cluster.c |    7 ++++++-
>  arch/x86/kernel/apic/x2apic_phys.c    |   10 +++++++++-
>  arch/x86/kernel/apic/x2apic_uv_x.c    |    7 ++++++-
>  5 files changed, 37 insertions(+), 19 deletions(-)

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.

Thanks,

	Ingo
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