lkml.org 
[lkml]   [2009]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] ACPI processor: force throttling state when BIOS returns incorrect value
(cc stable)

On Mon, 17 Aug 2009 14:43:34 +0200 Frans Pop <elendil@planet.nl> wrote:

> If the BIOS reports an invalid throttling state (which seems to be
> fairly common after system boot), a reset is done to state T0.
> Because of a check in acpi_processor_get_throttling_ptc(), the reset
> never actually gets executed, which results in the error reoccurring
> on every access of for example /proc/acpi/processor/CPU0/throttling.
>
> Add a 'force' option to acpi_processor_set_throttling() to ensure
> the reset really takes effect.
>
> http://bugzilla.kernel.org/show_bug.cgi?id=13389
>
> Signed-off-by: Frans Pop <elendil@planet.nl>
> Acked-by: Zhang Rui <rui.zhang@intel.com>

Unfortunately there are changes in linux-next which make this patch
inapplicable in non-trivial ways.

So we'll be needing one flavour of the patch for 2.6.30.x and 2.6.31.x
(the patch you just sent) and a different flavour for 2.6.32.

Or we preempt the pending linux-next changes and jam these patches into the
tree first.

>
> This patch, together with the next one, fixes a regression introduced in
> 2.6.30, listed on the regression list. They have been available for 2.5
> months now in bugzilla, but have not been picked up, despite various
> reminders and without any reason given.
>
> Google shows that numerous people are hitting this issue. The issue is in
> itself relatively minor, but the bug in the code is clear.
>
> The patches have been in all mu kernels and today testing has shown that
> throttling works correctly with the patches applied when the system
> overheats (http://bugzilla.kernel.org/show_bug.cgi?id=13918#c14).

OK, that sucks.

Guys, what happened here? Fixing regressions surely is our number one
hair-on-fire priority, yet the ACPI developers have found other things
to be doing for two and a half months and now we have a mess on our
hands.

Did this just fall through the cracks or is there some problem?


\
 
 \ /
  Last update: 2009-08-19 21:03    [W:0.653 / U:0.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site