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Date: Tue, 24 Jun 2008 08:14:55 -0400
From: "Mark M. Hoffman" <mhoffman@...htlink.com>
To: Zhang Rui <rui.zhang@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Robert Hancock <hancockr@...w.ca>,
Rene Herman <rene.herman@...access.nl>,
Hans de Goede <j.w.r.degoede@....nl>,
Jean Delvare <khali@...ux-fr.org>, linux-acpi@...r.kernel.org,
lm-sensors@...sensors.org,
Linux Kernel <linux-kernel@...r.kernel.org>,
Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 2.6.26-rc] ACPI Thermal Zone driver breaks lm-sensors 2 userspace
Hi:
* Zhang Rui <rui.zhang@...el.com> [2008-06-24 11:47:38 +0800]:
(snip)
> Following is a possible solution which is also from Rene,
> while I think CONFIG_THERMAL_HWMON should be "default n".
I agree that it should default off. With that change...
Acked-by: Mark M. Hoffman <mhoffman@...htlink.com>
> thanks,
> rui
>
> >From 7b41d17346cdd1f9db1223c024bd9f4604ee5c82 Mon Sep 17 00:00:00 2001
> From: Rene Herman <rene.herman@...il.com>
> Date: Mon, 23 Jun 2008 21:50:25 +0200
> Subject: [PATCH] acpi/thermal: allow disabling of thermal zone hwmon support
>
> 2.6.26-rc gained a hwmon interface to the Thermal Zone driver
> which unfortunately breaks lm-sensors 2 userspace and renders
> all other (subsequent) hwmon sensors inoperable also.
>
> Many systems, current slackware and derivative systems among
> them, are using lm-sensors 2 and would be affected. A new
> lm-sensors 2.10.7 release is needed to fix this from the user
> side.
>
> This makes the hwmon support optional (enabled by default) and
> comments that it needs a new enough lm-sensors userspace. This
> also immediately schedules the option for removal again as this
> is only intended to not break systems over the 2.6.26 upgrade
> when new enough lm-sensors is not yet available or widely
> deployed.
>
> Signed-off-by: Rene Herman <rene.herman@...il.com>
> CC: Len Brown <lenb@...nel.org>
> CC: Hans de Goede <j.w.r.degoede@....nl>
> CC: Zhang Rui <rui.zhang@...el.com>
> CC: Mark M. Hoffman <mhoffman@...htlink.com>
> CC: Jean Delvare <khali@...ux-fr.org>
> CC: linux-acpi@...r.kernel.org
> CC: lm-sensors@...sensors.org
> CC: linux-kernel@...r.kernel.org
> ---
> Documentation/feature-removal-schedule.txt | 9 +++++++++
> drivers/thermal/Kconfig | 10 ++++++++++
> drivers/thermal/thermal_sys.c | 4 ++--
> include/linux/thermal.h | 6 ++----
> 4 files changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
> index 5b3f31f..46ece3f 100644
> --- a/Documentation/feature-removal-schedule.txt
> +++ b/Documentation/feature-removal-schedule.txt
> @@ -312,3 +312,12 @@ When: 2.6.26
> Why: Implementation became generic; users should now include
> linux/semaphore.h instead.
> Who: Matthew Wilcox <willy@...ux.intel.com>
> +
> +---------------------------
> +
> +What: CONFIG_THERMAL_HWMON
> +When: January 2009
> +Why: This option was introduced just to allow older lm-sensors userspace
> + to keep working over the upgrade to 2.6.26. At the scheduled time of
> + removal fixed lm-sensors (2.x or 3.x) should be readily available.
> +Who: Rene Herman <rene.herman@...il.com>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 4b62852..0b359ab 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -12,3 +12,13 @@ menuconfig THERMAL
> cooling devices.
> All platforms with ACPI thermal support can use this driver.
> If you want this support, you should say Y or M here.
> +
> +config THERMAL_HWMON
> + bool "Hardware monitoring support"
> + depends on HWMON=y || HWMON=THERMAL
> + default y
> + help
> + The generic thermal sysfs driver's hardware monitoring support
> + requires a 2.10.7/3.0.2 or later lm-sensors userspace.
> +
> + Say Y unless you need support for older lm-sensors.
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 6098787..fe07462 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -295,8 +295,8 @@ thermal_cooling_device_trip_point_show(struct device *dev,
>
> /* Device management */
>
> -#if defined(CONFIG_HWMON) || \
> - (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
> +#if defined(CONFIG_THERMAL_HWMON)
> +
> /* hwmon sys I/F */
> #include <linux/hwmon.h>
> static LIST_HEAD(thermal_hwmon_list);
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 06d3e6e..917707e 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -66,8 +66,7 @@ struct thermal_cooling_device {
> ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
> #define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
>
> -#if defined(CONFIG_HWMON) || \
> - (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
> +#if defined(CONFIG_THERMAL_HWMON)
> /* thermal zone devices with the same type share one hwmon device */
> struct thermal_hwmon_device {
> char type[THERMAL_NAME_LENGTH];
> @@ -94,8 +93,7 @@ struct thermal_zone_device {
> struct idr idr;
> struct mutex lock; /* protect cooling devices list */
> struct list_head node;
> -#if defined(CONFIG_HWMON) || \
> - (defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
> +#if defined(CONFIG_THERMAL_HWMON)
> struct list_head hwmon_node;
> struct thermal_hwmon_device *hwmon;
> struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
> --
> 1.5.5
>
>
Regards,
--
Mark M. Hoffman
mhoffman@...htlink.com
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