linux-kernel - Re: [lm-sensors] coretemp.0 folder contents changed

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Date:	Tue, 6 May 2014 13:55:58 +0200
From:	Jean Delvare <jdelvare@...e.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] coretemp.0 folder contents changed

Hi Guenter, Srinivas,

On Mon, 5 May 2014 10:32:31 -0700, Guenter Roeck wrote:
> On Mon, May 05, 2014 at 10:13:11AM -0700, Srinivas Pandruvada wrote:
> > for kernel : 3.15.rc3 .
> > 
> > Is there any change in the coretemp? Previously we used to see,
> > tempx data (like temp2_input, temp2_max etc.)
> > /sys/devices/platform/coretemp.0/.
>
> That isn't where you are supposed to look for hwmon attributes.

Actually I used to recommend looking there when people were not using
libsensors (e.g. for pwmconfig / fancontrol or custom scripts.) This
path had the great merit of being stable across reboots, while hwmon
class device numbers are not (or at least they aren't guaranteed to be.)

> (...)
> To give you the background, hwmon attributes are in the process of
> being moved from the parent device to the hwmon device, or from
> /sys/class/hwmon/hwmonX/device/ to /sys/class/hwmon/hwmonX/,
> as part of an effort to streamline the code and make it more
> consistent and maintainable.

I am just realizing that we are also losing the stability of hardware
device based paths with that move :( I suppose I shouldn't have
bothered adding support for this to fancontrol.

Don't get me wrong, I still believe this is the right move, but I fear
that the question of persistent hwmon device names will resurface every
now and then again. libsensors offers a solution but 1* it lacks
support for pwm attributes and 2* it doesn't help with shell or perl
scripts such as pwmconfig and fancontrol.

-- 
Jean Delvare
SUSE L3 Support
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