* [merged mm-nonmm-stable] docs-thermal-sync-hardware-protection-doc-with-code.patch removed from -mm tree
@ 2025-03-17 5:31 Andrew Morton
0 siblings, 0 replies; only message in thread
From: Andrew Morton @ 2025-03-17 5:31 UTC (permalink / raw)
To: mm-commits, tzungbi, teknoraver, serge, rui.zhang, robh, rafael,
mazziesaccount, lukasz.luba, lgirdwood, kernel, groeck, festevam,
daniel.lezcano, corbet, broonie, bleung, a.fatoum, akpm
The quilt patch titled
Subject: docs: thermal: sync hardware protection doc with code
has been removed from the -mm tree. Its filename was
docs-thermal-sync-hardware-protection-doc-with-code.patch
This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: docs: thermal: sync hardware protection doc with code
Date: Mon, 17 Feb 2025 21:39:43 +0100
Originally, the thermal framework's only hardware protection action was to
trigger a shutdown. This has been changed a little over a year ago to
also support rebooting as alternative hardware protection action.
Update the documentation to reflect this.
Link: https://lkml.kernel.org/r/20250217-hw_protection-reboot-v3-3-e1c09b090c0c@pengutronix.de
Fixes: 62e79e38b257 ("thermal/thermal_of: Allow rebooting after critical temp")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Cc: Benson Leung <bleung@chromium.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matteo Croce <teknoraver@meta.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Rob Herring (Arm) <robh@kernel.org>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/driver-api/thermal/sysfs-api.rst | 25 ++++++++-------
1 file changed, 14 insertions(+), 11 deletions(-)
--- a/Documentation/driver-api/thermal/sysfs-api.rst~docs-thermal-sync-hardware-protection-doc-with-code
+++ a/Documentation/driver-api/thermal/sysfs-api.rst
@@ -413,18 +413,21 @@ This function serves as an arbitrator to
device. It sets the cooling device to the deepest cooling state if
possible.
-5. thermal_emergency_poweroff
-=============================
+5. Critical Events
+==================
-On an event of critical trip temperature crossing the thermal framework
-shuts down the system by calling hw_protection_shutdown(). The
-hw_protection_shutdown() first attempts to perform an orderly shutdown
-but accepts a delay after which it proceeds doing a forced power-off
-or as last resort an emergency_restart.
+On an event of critical trip temperature crossing, the thermal framework
+will trigger a hardware protection power-off (shutdown) or reboot,
+depending on configuration.
+
+At first, the kernel will attempt an orderly power-off or reboot, but
+accepts a delay after which it proceeds to do a forced power-off or
+reboot, respectively. If this fails, ``emergency_restart()`` is invoked
+as last resort.
The delay should be carefully profiled so as to give adequate time for
-orderly poweroff.
+orderly power-off or reboot.
-If the delay is set to 0 emergency poweroff will not be supported. So a
-carefully profiled non-zero positive value is a must for emergency
-poweroff to be triggered.
+If the delay is set to 0, the emergency action will not be supported. So a
+carefully profiled non-zero positive value is a must for the emergency
+action to be triggered.
_
Patches currently in -mm which might be from a.fatoum@pengutronix.de are
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2025-03-17 5:31 [merged mm-nonmm-stable] docs-thermal-sync-hardware-protection-doc-with-code.patch removed from -mm tree Andrew Morton
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