lkml.org 
[lkml]   [2013]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subjectudev: New default rule for autoloading kernel modules matching CPU modalias
Date
Hi Kay,

After a recent change present in 3.11-rc1 there is a driver, called processor,
that can be bound to the CPU devices whose sysfs directories are located under
/sys/devices/system/cpu/. A side effect of this is that, after the driver has
been bound to those devices, the kernel adds DRIVER=processor to ENV for CPU
uevents and they don't match the default rule for autoloading modules matching
MODALIAS:

DRIVER!="?*", ENV{MODALIAS}=="?*", IMPORT{builtin}="kmod load $env{MODALIAS}"

any more. However, there are some modules whose module aliases match specific
CPU features through the modalias string and those modules should be loaded
automatically if a compatible CPU is present. Yet, with the processor driver
bound to the CPU devices the above rule is not sufficient for that, so we need
a new default udev rule allowing those modules to be autoloaded even if the
CPU devices have drivers.

On my test systems I added the following rule for that:

ACTION="add", SUBSYSTEM=="cpu", ENV{MODALIAS}=="?*", IMPORT{builtin}="kmod load $env{MODALIAS}"

in a separate file, but I'm not a udev expert, so I guess it may be done in a
better way.

Can you please consider adding such a rule to the default set of udev rules?

Rafael


--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.


\
 
 \ /
  Last update: 2013-07-20 13:21    [W:1.122 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site