linux-kernel - Re: [RFC PATCH V4 3/5] cpuidle: default idle driver for x86

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Message-ID: <4D89BDE2.9040606@linux.vnet.ibm.com>
Date:	Wed, 23 Mar 2011 15:01:14 +0530
From:	Trinabh Gupta <trinabh@...ux.vnet.ibm.com>
To:	Len Brown <lenb@...nel.org>
CC:	arjan@...ux.intel.com, peterz@...radead.org,
	suresh.b.siddha@...el.com, benh@...nel.crashing.org,
	venki@...gle.com, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	sfr@...b.auug.org.au, xen-devel@...ts.xensource.com
Subject: Re: [RFC PATCH V4 3/5] cpuidle: default idle driver for x86


On 03/23/2011 08:43 AM, Len Brown wrote:
> Why is this patch a step forward?

Hi Len,

I have basically moved the code for arch default and mwait
idle from arch/x86/kernel/process.c to a driver. This was
suggested by Venki (https://lkml.org/lkml/2010/10/19/460)
as part of pm_idle cleanup and direct call of
cpuidle_idle_call(). There is not much new code here.

>
>> +obj-$(CONFIG_X86)                              += default_driver.o
>
> BTW, that's a pretty generic name for an x86 specific idle driver...
>
> I think that on builds that support intel_idle and acpi_idle,
> everything in this file will be unused, unless somebody uses some
> debugging cmdline params that should have been deleted ages ago.

Yes, I agree that the name has to be x86 specific. I think the
routines would be used for pre-nehalem architectures that use
arch default or mwait.

Thanks,
-Trinabh

>
> thanks,
> Len Brown, Intel Open Source Technology Center
>
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