linux-kernel - RE: 2.6.19-rc5-mm2

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Date:	Wed, 15 Nov 2006 10:06:23 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Mattia Dongili" <malattia@...ux.it>
Cc:	<ego@...ibm.com>, "Reuben Farrelly" <reuben-linuxkernel@...b.net>,
	"Andrew Morton" <akpm@...l.org>, <davej@...hat.com>,
	<linux-kernel@...r.kernel.org>,
	"CPUFreq Mailing List" <cpufreq@...ts.linux.org.uk>,
	"Sadykov, Denis M" <denis.m.sadykov@...el.com>
Subject: RE: 2.6.19-rc5-mm2

 

>-----Original Message-----
>From: Mattia Dongili [mailto:malattia@...ux.it] 
>Sent: Wednesday, November 15, 2006 9:47 AM
>To: Pallipadi, Venkatesh
>Cc: ego@...ibm.com; Reuben Farrelly; Andrew Morton; 
>davej@...hat.com; linux-kernel@...r.kernel.org; CPUFreq 
>Mailing List; Sadykov, Denis M
>Subject: Re: 2.6.19-rc5-mm2
>
>On Wed, Nov 15, 2006 at 06:09:47AM -0800, Pallipadi, Venkatesh wrote:
>[...]
>> >data->cpu_feature == ACPI_ADR_SPACE_FIXED_HARDWARE.
>> 
>> Yes. Patch from Mattia is indeed required for acpi-cpufreq. 
>> Mattia: Can you please send the patch towards Andrew (With signed off
>> etc) for inclusion.
>
>Venki, I'm a little worried about the switch/case in question (line
>702): the data->cpu_feature is set either to SYSTEM_IO_CAPABLE or
>SYSTEM_INTEL_MSR_CAPABLE just a few lines above so it seems the switch
>variable is wrong and none of the 2 cases will ever get a chance to
>execute.
>

The variable is set few lines before. So, it should be OK to switch on
that 
variable set and one of the two cases will execute. isn't it? Or am 
I missing something?

>Unfortunately I don't have enough knowledge to tell if it's simply
>necessary to fix the switch variable as 

Get_cur_freq_on_cpu will not work on SYSTEM_IO space as ACPI does not
have an interface to get the current frequency. It only has a interface
to say whether the last transitions tried was successful or not.
So, if indeed a change in switch is required, first option should be
good...

Thanks,
Venki
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