linux-kernel - RE: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

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Message-ID: <924EFEDD5F540B4284297C4DC59F3DEE38C313@orsmsx423.amr.corp.intel.com>
Date:	Fri, 7 Dec 2007 13:38:00 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Pavel Machek" <pavel@....cz>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>, <lkml@....ca>,
	<abelay@...ell.com>, <lenb@...nel.org>, <mlord@...ox.com>,
	<rjw@...k.pl>, <linux-kernel@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>
Subject: RE: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

 

>-----Original Message-----
>From: Pavel Machek [mailto:pavel@....cz] 
>Sent: Wednesday, December 05, 2007 3:17 AM
>To: Pallipadi, Venkatesh
>Cc: Andrew Morton; lkml@....ca; abelay@...ell.com; 
>lenb@...nel.org; mlord@...ox.com; rjw@...k.pl; 
>linux-kernel@...r.kernel.org; linux-acpi@...r.kernel.org
>Subject: Re: + restore-missing-sysfs-max_cstate-attr.patch 
>added to -mm tree
>
>Hi!
>
>> >It is not known whether Mark is actually writing to this 
>> >thing.  Perhaps
>> >read-only permissions would be a suitable fix?
>> >
>> 
>> Exporting it as read only should be OK. We also need to know if there
>> are hard user space dependency on writing to this from userspace.
>
>Some people are manipulating it from their suspend scripts..
>

That is done by default in kernel now. Deep C-states are disabled
between suspend and resume.

Thanks,
Venki
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