linux-kernel - RE: [Xen-devel] [PATCH 1/2] Xen acpi pad implement

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Date:	Fri, 26 Oct 2012 12:37:36 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Jan Beulich <jbeulich@...e.com>
CC:	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: RE: [Xen-devel] [PATCH 1/2] Xen acpi pad implement

-----Original Message-----
From: xen-devel-bounces@...ts.xen.org [mailto:xen-devel-bounces@...ts.xen.org] On Behalf Of Jan Beulich
Sent: Friday, October 26, 2012 8:02 PM
To: Liu, Jinsong
Cc: konrad.wilk@...cle.com; linux-kernel@...r.kernel.org; xen-devel@...ts.xen.org
Subject: Re: [Xen-devel] [PATCH 1/2] Xen acpi pad implement

>>> "Liu, Jinsong" <jinsong.liu@...el.com> 10/26/12 8:18 AM >>>
>> +static struct acpi_driver xen_acpi_pad_driver = {
>> +    .name = "processor_aggregator",
>> +    .class = ACPI_PROCESSOR_AGGREGATOR_CLASS,
>> +    .ids = pad_device_ids,
>> +    .ops = {
>> +        .add = xen_acpi_pad_add,
>
>.remove?
>
>[Jinsong] .remove method not used by any logic now (any possible point use it?), so we remove it from our former patch.

Unless there is technical difficulty implementing it, I wouldn't defer adding that code until the point where something doesn't work anymore.

[Jinsong] No technical difficulty at all, in fact at last version it has .remove method. I will re-add it.

>Overall I'd recommend taking a look at the cleaned up driver in
>our kernels.
>
>[Jinsong] What's your point here?

There's quite a bit of cleanup/simplification potential here, and rather than pointing the pieces out individually I would think comparing with what we have in production use might be worthwhile. But that's up to you of course.

[Jinsong] I know your concern now -- we can cleanup/simplify xen pad logic by piggyback on native acpi pad code -- technically it's true. However, we intentionally do so in order to keep xen pad logic self-contained, just like what xen mcelog logic did before.

Thanks,
Jinsong--
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