[Bugme-new] [Bug 40312] New: /sys/bus/platform/devices/coretemp content is changed from previous kernels

Thu Jul 28 23:31:35 PDT 2011

https://bugzilla.kernel.org/show_bug.cgi?id=40312

           Summary: /sys/bus/platform/devices/coretemp content is changed
                    from previous kernels
           Product: Drivers
           Version: 2.5
    Kernel Version: linux 3.0.0 stable
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Hardware Monitoring
        AssignedTo: khali at linux-fr.org
        ReportedBy: a.antolini at infinito.it
        Regression: No

After upgrading my linux box to kernel 3.0 I noticed a different management of
coretemp module while till kernel 2.6.39.x (and all previous) , everything was
ok

Try to explain better

This is my CPU 

vendor_id    : GenuineIntel
cpu family    : 6
model        : 23
model name    : Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz
stepping    : 10

- coretemp.ko module is loaded correctly

- lm-sensor ver 3.3.1 works well  report correct info as usual 
   coretemp-isa-0000
   Adapter: ISA adapter
   Core 0:       +42.0°C  (high = +72.0°C, crit = +100.0°C)
   Core 1:       +42.0°C  (high = +72.0°C, crit = +100.0°C)
   Core 2:       +43.0°C  (high = +72.0°C, crit = +100.0°C)
   Core 3:       +46.0°C  (high = +72.0°C, crit = +100.0°C)

but some other apps like conky 1.8.1 reports this :
Conky: can't open '/sys/bus/platform/devices/coretemp.0/temp1_input': No such
file or directory

after a little investigation I saw some changes in the content of
/sys/bus/platform/devices/coretemp* 

this is the output with a 2.6.39.x kernel 

total 0
   15 drwxr-xr-x 2 root root 0 Jul 28  2011 ./
   13 drwxr-xr-x 4 root root 0 Jul 28  2011 ../
14412 lrwxrwxrwx 1 root root 0 Jul 28 19:53 coretemp.0 ->
../../../devices/platform/coretemp.0
14431 lrwxrwxrwx 1 root root 0 Jul 28 19:53 coretemp.1 ->
../../../devices/platform/coretemp.1
14450 lrwxrwxrwx 1 root root 0 Jul 28 19:53 coretemp.2 ->
../../../devices/platform/coretemp.2
14469 lrwxrwxrwx 1 root root 0 Jul 28 19:53 coretemp.3 ->
../../../devices/platform/coretemp.3

in each dir I had the variables for any single core starting from 1 to 4
e.g. for coretemp.0 the content is:

... temp1_crit
... temp1_crit_alarm
... temp1_input
... temp1_label
... temp1_max

while on linux 3.0 i have only:

14431 lrwxrwxrwx 1 root root 0 Jul 29 07:53
/sys/bus/platform/devices/coretemp.0 -> ../../../devices/platform/coretemp.0/

and the content of this dir is this :
14438 drwxr-xr-x  3 root root    0 Jul 29 07:53 hwmon/
14430 -r--r--r--  1 root root 4.0K Jul 29 07:54 modalias
14437 -r--r--r--  1 root root 4.0K Jul 29 07:54 name
14432 lrwxrwxrwx  1 root root    0 Jul 29 07:53 subsystem ->
../../../bus/platform/
14449 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp2_crit
14446 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp2_crit_alarm
14448 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp2_input
14445 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp2_label
14447 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp2_max
14454 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp3_crit
14451 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp3_crit_alarm
14453 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp3_input
14450 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp3_label
14452 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp3_max
14459 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp4_crit
14456 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp4_crit_alarm
14458 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp4_input
14455 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp4_label
14457 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp4_max
14898 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp5_crit
14895 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp5_crit_alarm
14897 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp5_input
14460 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp5_label
14896 -r--r--r--  1 root root 4.0K Jul 29 07:54 temp5_max
14429 -rw-r--r--  1 root root 4.0K Jul 29 07:53 uevent

as you can see all variables are in the same dir and the core count start from
2 to 5 instead of 1 to 4 as should be (I guess)

Does anybody have an idea about this change?

thanks in advance
Andrea

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