linux-kernel - Re: [PATCH] acpi: handle ACPI0007 Device in acpi_early_set

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Message-ID: <4C93B561.2040902@kernel.org>
Date:	Fri, 17 Sep 2010 11:37:21 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"Brown, Len" <len.brown@...el.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Lin Ming <ming.m.lin@...el.com>,
	Bob Moore <robert.moore@...el.com>
Subject: Re: [PATCH] acpi: handle ACPI0007 Device in acpi_early_set_pdc

On 09/17/2010 06:56 AM, Bjorn Helgaas wrote:
> On Friday, September 17, 2010 01:21:56 am Yinghai Lu wrote:
>> On 09/13/2010 10:28 AM, Bjorn Helgaas wrote:
>>> On Friday, September 10, 2010 08:06:26 pm Yinghai Lu wrote:
>>>
>>> I timed the original on a 64-CPU box where the namespace walk cost
>>> should be relatively high, and the walk you added takes about 0.01
>>> seconds.  The one already there took about 0.03 seconds, so neither
>>> costs very much.
>>>
>>> And I don't like the fact that the patch below changes the ACPI CA
>>> and it only partly implements acpi_get_devices(), since it ignores
>>> _CID and _STA.
>>
>> please check this one. it still keep _STA etc.
> 
> I think you missed this line in my previous response:
> 
>>> But I do see your point, and having seen the patch
>>> below, I prefer the original one-line version.
> 
> The patch below is better, because it doesn't reimplement quite
> so much stuff, but it still changes the CA,
not sure.
> and I think the end
> result is still quite confusing to read.
yeah, it is confusing to read.... callback with callback.
> 
> So I still prefer the original one-line version.

ok, Will resend out original one with updated changelog.

Yinghai
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