linux-kernel - Re: [PATCH v2 0/3] gov_power_allocator: Allow binding before cooling devices

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Message-ID: <18a16fcd-3ae1-48af-94ed-72700a656e8e@lausen.nl>
Date: Tue, 9 Apr 2024 10:41:59 -0400
From: Leonard Lausen <leonard@...sen.nl>
To: nikita@...n.ru, Lukasz Luba <lukasz.luba@....com>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
 linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
 Nikita Travkin <nikitos.tr@...il.com>
Subject: Re: [PATCH v2 0/3] gov_power_allocator: Allow binding before cooling
 devices

Hi Nikita, Hi Łukasz,

thank you for fixing the e83747c2f8e3 ("thermal: gov_power_allocator: Set up trip points earlier") and 912e97c67cc3 ("thermal: gov_power_allocator: Move memory allocation out of throttle()") regressions as part of v6.9-rc3. As the regression was introduced in v6.8, would it be possible to include the fix in a v6.8 patch release?

Thank you
Leonard

#regzbot introduced: 912e97c67cc3f333c4c5df8f51498c651792e658
#regzbot fixed-by: 1057c4c36ef8b236a2e28edef301da0801338c5f

#regzbot introduced: e83747c2f8e3cc5e284e37a8921099f1901d79d8
#regzbot fixed-by: da781936e7c301e6197eb6513775748e79fb2575

On 4/3/24 07:31, Nikita Travkin via B4 Relay wrote:
> Recent changes in IPA made it fail probing if the TZ has no cooling
> devices attached on probe or no trip points defined.
> 
> This series restores prior behavior to:
> 
> - allow IPA to probe before cooling devices have attached;
> - allow IPA to probe when the TZ has no passive/active trip points.
> 
> I've noticed that all thermal zones fail probing with -EINVAL on my
> sc7180 based Acer Aspire 1 since 6.8. This series allows me to bring
> them back.
> 
> Additionally there is a commit that supresses the "sustainable_power
> will be estimated" warning on TZ that have no trip points (and thus IPA
> will not be able to do anything for them anyway). This allowed me to
> notice that some of the TZ with cooling_devices on my platform actually
> lack the sustainable_power value.
> 
> Signed-off-by: Nikita Travkin <nikita@...n.ru>
> ---
> Changes in v2:
> - Split to two changes (Lukasz)
> - Return 0 in allocate_actors_buffer() instead of suppressing -EINVAL
>   (Lukasz)
> - Add a change to supress "sustainable_power will be estimated" warning
>   on "empty" TZ
> - Link to v1: https://lore.kernel.org/r/20240321-gpa-no-cooling-devs-v1-1-5c9e0ef2062e@trvn.ru
> 
> ---
> Nikita Travkin (3):
>       thermal: gov_power_allocator: Allow binding without cooling devices
>       thermal: gov_power_allocator: Allow binding without trip points
>       thermal: gov_power_allocator: Suppress sustainable_power warning without trip_points
> 
>  drivers/thermal/gov_power_allocator.c | 16 ++++++----------
>  1 file changed, 6 insertions(+), 10 deletions(-)
> ---
> base-commit: 727900b675b749c40ba1f6669c7ae5eb7eb8e837
> change-id: 20240321-gpa-no-cooling-devs-c79ee3288325
> 
> Best regards,