* Missing MODALIAS in /sys/devices/system/cpu/uevent
@ 2014-11-27 20:01 Pali Rohár
2014-11-27 20:39 ` Rafael J. Wysocki
0 siblings, 1 reply; 7+ messages in thread
From: Pali Rohár @ 2014-11-27 20:01 UTC (permalink / raw)
To: Greg Kroah-Hartman, Rafael J. Wysocki, Len Brown, linux-acpi,
linux-kernel
[-- Attachment #1: Type: Text/Plain, Size: 1102 bytes --]
Hello,
on 3.18-rc5 I have empty cpu uevent file, but modalias file is
populated. See:
$ cat /sys/devices/system/cpu/uevent
$ cat /sys/devices/system/cpu/modalias
cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,00E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,012B,012D,0140
For all other devices in /sys/devices/ which have modalias
content there is also MODALIAS= line in uevent file.
Is cpu device special? Or why it is only one device which has
modalias file but is missing MODALIAS= line in uevent file?
What userspace application should use for reading modalias
string? File modalias or file uevent?
--
Pali Rohár
pali.rohar@gmail.com
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Missing MODALIAS in /sys/devices/system/cpu/uevent
2014-11-27 20:39 ` Rafael J. Wysocki
@ 2014-11-27 20:24 ` Pali Rohár
2014-11-27 20:56 ` Rafael J. Wysocki
0 siblings, 1 reply; 7+ messages in thread
From: Pali Rohár @ 2014-11-27 20:24 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: Greg Kroah-Hartman, Len Brown, linux-acpi, linux-kernel
[-- Attachment #1: Type: Text/Plain, Size: 3033 bytes --]
On Thursday 27 November 2014 21:39:42 Rafael J. Wysocki wrote:
> On Thursday, November 27, 2014 09:01:11 PM Pali Rohár wrote:
> > --nextPart2712852.Yg3XtZvm05
> > Content-Type: Text/Plain;
> >
> > charset="utf-8"
> >
> > Content-Transfer-Encoding: quoted-printable
> >
> > Hello,
> >
> > on 3.18-rc5 I have empty cpu uevent file, but modalias file
> > is=20 populated. See:
> >
> > $ cat /sys/devices/system/cpu/uevent=20
> > $ cat /sys/devices/system/cpu/modalias=20
> > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0
> > 003,0004,0005,0=
> > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,
> > 0015,0016,0017,0=
> > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,
> > 0068,006B,006C,0=
> > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,
> > 0082,0083,0084,0=
> > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,
> > 0094,0095,0096,0=
> > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,
> > 00E3,00E5,00E6,0=
> > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,
> > 0128,0129,012A,0= 12B,012D,0140
> >
> > =46or all other devices in /sys/devices/ which have
> > modalias=20 content there is also MODALIAS=3D line in
> > uevent file.
>
> /sys/devices/system/cpu/ is not a device. It is a "collection
> of all CPUs".
>
Ok. But why that inconsistency (missing MODALIAS line)?
> > Is cpu device special? Or why it is only one device which
> > has=20 modalias file but is missing MODALIAS=3D line in
> > uevent file?
>
> Look into the uevent files under /sys/devices/system/cpu/cpu0/
> etc.
>
$ cat /sys/devices/system/cpu/cpu0/modalias
cat: /sys/devices/system/cpu/cpu0/modalias: No such file or
directory
$ cat /sys/devices/system/cpu/cpu0/uevent
DRIVER=processor
MODALIAS=cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,00E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,012B,012D,0140
So there is no modalias file, but uevent contains MODALIAS line.
> > What userspace application should use for reading
> > modalias=20 string? File modalias or file uevent?
>
> The cpu modalias is used to trigger loading of some
> CPU-specific modules upfront IIRC. So yes, it is special.
>
> My advice would be to follow udev here.
Yes, I know. For some reasons coretemp.ko is not automatically
loaded. I do not know why and I started investigating it. And I
found above inconsistency in modalias and uevent...
$ modinfo coretemp
...
alias: cpu:type:x86,ven0000fam*mod*:feature:*00E7*
--
Pali Rohár
pali.rohar@gmail.com
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Missing MODALIAS in /sys/devices/system/cpu/uevent
2014-11-27 20:01 Missing MODALIAS in /sys/devices/system/cpu/uevent Pali Rohár
@ 2014-11-27 20:39 ` Rafael J. Wysocki
2014-11-27 20:24 ` Pali Rohár
0 siblings, 1 reply; 7+ messages in thread
From: Rafael J. Wysocki @ 2014-11-27 20:39 UTC (permalink / raw)
To: Pali Rohár; +Cc: Greg Kroah-Hartman, Len Brown, linux-acpi, linux-kernel
On Thursday, November 27, 2014 09:01:11 PM Pali Rohár wrote:
>
> --nextPart2712852.Yg3XtZvm05
> Content-Type: Text/Plain;
> charset="utf-8"
> Content-Transfer-Encoding: quoted-printable
>
> Hello,
>
> on 3.18-rc5 I have empty cpu uevent file, but modalias file is=20
> populated. See:
>
> $ cat /sys/devices/system/cpu/uevent=20
> $ cat /sys/devices/system/cpu/modalias=20
> cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0=
> 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0=
> 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,0=
> 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0=
> 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0=
> 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,0=
> 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,0=
> 12B,012D,0140
>
> =46or all other devices in /sys/devices/ which have modalias=20
> content there is also MODALIAS=3D line in uevent file.
/sys/devices/system/cpu/ is not a device. It is a "collection of all CPUs".
> Is cpu device special? Or why it is only one device which has=20
> modalias file but is missing MODALIAS=3D line in uevent file?
Look into the uevent files under /sys/devices/system/cpu/cpu0/ etc.
> What userspace application should use for reading modalias=20
> string? File modalias or file uevent?
The cpu modalias is used to trigger loading of some CPU-specific modules
upfront IIRC. So yes, it is special.
My advice would be to follow udev here.
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Missing MODALIAS in /sys/devices/system/cpu/uevent
2014-11-27 21:00 ` Rafael J. Wysocki
@ 2014-11-27 20:43 ` Pali Rohár
0 siblings, 0 replies; 7+ messages in thread
From: Pali Rohár @ 2014-11-27 20:43 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: Greg Kroah-Hartman, Len Brown, linux-acpi, linux-kernel
[-- Attachment #1: Type: Text/Plain, Size: 4441 bytes --]
On Thursday 27 November 2014 22:00:32 Rafael J. Wysocki wrote:
> On Thursday, November 27, 2014 09:59:03 PM Rafael J. Wysocki
wrote:
> > On Thursday, November 27, 2014 09:56:56 PM Rafael J. Wysocki
wrote:
> > > On Thursday, November 27, 2014 09:24:30 PM Pali Rohár
wrote:
> > > > On Thursday 27 November 2014 21:39:42 Rafael J. Wysocki
wrote:
> > > > > On Thursday, November 27, 2014 09:01:11 PM Pali Rohár
wrote:
> > > > > > --nextPart2712852.Yg3XtZvm05
> > > > > > Content-Type: Text/Plain;
> > > > > >
> > > > > > charset="utf-8"
> > > > > >
> > > > > > Content-Transfer-Encoding: quoted-printable
> > > > > >
> > > > > > Hello,
> > > > > >
> > > > > > on 3.18-rc5 I have empty cpu uevent file, but
> > > > > > modalias file is=20 populated. See:
> > > > > >
> > > > > > $ cat /sys/devices/system/cpu/uevent=20
> > > > > > $ cat /sys/devices/system/cpu/modalias=20
> > > > > > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,000
> > > > > > 1,0002,0 003,0004,0005,0=
> > > > > > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,001
> > > > > > 1,0013, 0015,0016,0017,0=
> > > > > > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003
> > > > > > B,003D, 0068,006B,006C,0=
> > > > > > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,008
> > > > > > 0,0081, 0082,0083,0084,0=
> > > > > > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,009
> > > > > > 1,0093, 0094,0095,0096,0=
> > > > > > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E
> > > > > > 0,00E1, 00E3,00E5,00E6,0=
> > > > > > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,012
> > > > > > 5,0127, 0128,0129,012A,0= 12B,012D,0140
> > > > > >
> > > > > > =46or all other devices in /sys/devices/ which have
> > > > > > modalias=20 content there is also MODALIAS=3D line
> > > > > > in uevent file.
> > > > >
> > > > > /sys/devices/system/cpu/ is not a device. It is a
> > > > > "collection of all CPUs".
> > > >
> > > > Ok. But why that inconsistency (missing MODALIAS line)?
> > > >
> > > > > > Is cpu device special? Or why it is only one device
> > > > > > which has=20 modalias file but is missing
> > > > > > MODALIAS=3D line in uevent file?
> > > > >
> > > > > Look into the uevent files under
> > > > > /sys/devices/system/cpu/cpu0/ etc.
> > > >
> > > > $ cat /sys/devices/system/cpu/cpu0/modalias
> > > > cat: /sys/devices/system/cpu/cpu0/modalias: No such file
> > > > or directory
> > > > $ cat /sys/devices/system/cpu/cpu0/uevent
> > > > DRIVER=processor
> > > > MODALIAS=cpu:type:x86,ven0000fam0006mod003C:feature:,000
> > > > 0,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C
> > > > ,000D,000E,000F,0010,0011,0013,0015,0016,0017,0018,0019,
> > > > 001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,0
> > > > 06B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,00
> > > > 7D,0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008
> > > > B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0097,0098
> > > > ,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,
> > > > 00E5,00E6,00E7,0100,0101,0102,0103,0104,0120,0121,0123,0
> > > > 124,0125,0127,0128,0129,012A,012B,012D,0140
> > > >
> > > > So there is no modalias file, but uevent contains
> > > > MODALIAS line.
> > > >
> > > > > > What userspace application should use for reading
> > > > > > modalias=20 string? File modalias or file uevent?
> > > > >
> > > > > The cpu modalias is used to trigger loading of some
> > > > > CPU-specific modules upfront IIRC. So yes, it is
> > > > > special.
> > > > >
> > > > > My advice would be to follow udev here.
> > > >
> > > > Yes, I know. For some reasons coretemp.ko is not
> > > > automatically loaded. I do not know why and I started
> > > > investigating it. And I found above inconsistency in
> > > > modalias and uevent...
> > > >
> > > > $ modinfo coretemp
> > > > ...
> > > > alias:
> > > > cpu:type:x86,ven0000fam*mod*:feature:*00E7*
> > >
> > > That may be a udev issue. See
> > >
> > > http://lists.freedesktop.org/archives/systemd-devel/2013-J
> > > uly/012165.html
> >
> > And it was fixed in udev quite some time ago.
>
> By this commit:
>
> http://cgit.freedesktop.org/systemd/systemd/commit/?id=bf7f800
> f2b3e93ccd1229d4717166f3a4d3af72f
Thanks for info! I checked system udev files (Ubuntu 12.04 LTS)
and this patch is not applied.
--
Pali Rohár
pali.rohar@gmail.com
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Missing MODALIAS in /sys/devices/system/cpu/uevent
2014-11-27 20:24 ` Pali Rohár
@ 2014-11-27 20:56 ` Rafael J. Wysocki
2014-11-27 20:59 ` Rafael J. Wysocki
0 siblings, 1 reply; 7+ messages in thread
From: Rafael J. Wysocki @ 2014-11-27 20:56 UTC (permalink / raw)
To: Pali Rohár; +Cc: Greg Kroah-Hartman, Len Brown, linux-acpi, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 3399 bytes --]
On Thursday, November 27, 2014 09:24:30 PM Pali Rohár wrote:
> On Thursday 27 November 2014 21:39:42 Rafael J. Wysocki wrote:
> > On Thursday, November 27, 2014 09:01:11 PM Pali Rohár wrote:
> > > --nextPart2712852.Yg3XtZvm05
> > > Content-Type: Text/Plain;
> > >
> > > charset="utf-8"
> > >
> > > Content-Transfer-Encoding: quoted-printable
> > >
> > > Hello,
> > >
> > > on 3.18-rc5 I have empty cpu uevent file, but modalias file
> > > is=20 populated. See:
> > >
> > > $ cat /sys/devices/system/cpu/uevent=20
> > > $ cat /sys/devices/system/cpu/modalias=20
> > > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0
> > > 003,0004,0005,0=
> > > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,
> > > 0015,0016,0017,0=
> > > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,
> > > 0068,006B,006C,0=
> > > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,
> > > 0082,0083,0084,0=
> > > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,
> > > 0094,0095,0096,0=
> > > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,
> > > 00E3,00E5,00E6,0=
> > > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,
> > > 0128,0129,012A,0= 12B,012D,0140
> > >
> > > =46or all other devices in /sys/devices/ which have
> > > modalias=20 content there is also MODALIAS=3D line in
> > > uevent file.
> >
> > /sys/devices/system/cpu/ is not a device. It is a "collection
> > of all CPUs".
> >
>
> Ok. But why that inconsistency (missing MODALIAS line)?
>
> > > Is cpu device special? Or why it is only one device which
> > > has=20 modalias file but is missing MODALIAS=3D line in
> > > uevent file?
> >
> > Look into the uevent files under /sys/devices/system/cpu/cpu0/
> > etc.
> >
>
> $ cat /sys/devices/system/cpu/cpu0/modalias
> cat: /sys/devices/system/cpu/cpu0/modalias: No such file or
> directory
> $ cat /sys/devices/system/cpu/cpu0/uevent
> DRIVER=processor
> MODALIAS=cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,00E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,012B,012D,0140
>
> So there is no modalias file, but uevent contains MODALIAS line.
>
> > > What userspace application should use for reading
> > > modalias=20 string? File modalias or file uevent?
> >
> > The cpu modalias is used to trigger loading of some
> > CPU-specific modules upfront IIRC. So yes, it is special.
> >
> > My advice would be to follow udev here.
>
> Yes, I know. For some reasons coretemp.ko is not automatically
> loaded. I do not know why and I started investigating it. And I
> found above inconsistency in modalias and uevent...
>
> $ modinfo coretemp
> ...
> alias: cpu:type:x86,ven0000fam*mod*:feature:*00E7*
That may be a udev issue. See
http://lists.freedesktop.org/archives/systemd-devel/2013-July/012165.html
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Missing MODALIAS in /sys/devices/system/cpu/uevent
2014-11-27 20:56 ` Rafael J. Wysocki
@ 2014-11-27 20:59 ` Rafael J. Wysocki
2014-11-27 21:00 ` Rafael J. Wysocki
0 siblings, 1 reply; 7+ messages in thread
From: Rafael J. Wysocki @ 2014-11-27 20:59 UTC (permalink / raw)
To: Pali Rohár; +Cc: Greg Kroah-Hartman, Len Brown, linux-acpi, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 3673 bytes --]
On Thursday, November 27, 2014 09:56:56 PM Rafael J. Wysocki wrote:
> On Thursday, November 27, 2014 09:24:30 PM Pali Rohár wrote:
> > On Thursday 27 November 2014 21:39:42 Rafael J. Wysocki wrote:
> > > On Thursday, November 27, 2014 09:01:11 PM Pali Rohár wrote:
> > > > --nextPart2712852.Yg3XtZvm05
> > > > Content-Type: Text/Plain;
> > > >
> > > > charset="utf-8"
> > > >
> > > > Content-Transfer-Encoding: quoted-printable
> > > >
> > > > Hello,
> > > >
> > > > on 3.18-rc5 I have empty cpu uevent file, but modalias file
> > > > is=20 populated. See:
> > > >
> > > > $ cat /sys/devices/system/cpu/uevent=20
> > > > $ cat /sys/devices/system/cpu/modalias=20
> > > > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0
> > > > 003,0004,0005,0=
> > > > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,
> > > > 0015,0016,0017,0=
> > > > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,
> > > > 0068,006B,006C,0=
> > > > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,
> > > > 0082,0083,0084,0=
> > > > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,
> > > > 0094,0095,0096,0=
> > > > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,
> > > > 00E3,00E5,00E6,0=
> > > > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,
> > > > 0128,0129,012A,0= 12B,012D,0140
> > > >
> > > > =46or all other devices in /sys/devices/ which have
> > > > modalias=20 content there is also MODALIAS=3D line in
> > > > uevent file.
> > >
> > > /sys/devices/system/cpu/ is not a device. It is a "collection
> > > of all CPUs".
> > >
> >
> > Ok. But why that inconsistency (missing MODALIAS line)?
> >
> > > > Is cpu device special? Or why it is only one device which
> > > > has=20 modalias file but is missing MODALIAS=3D line in
> > > > uevent file?
> > >
> > > Look into the uevent files under /sys/devices/system/cpu/cpu0/
> > > etc.
> > >
> >
> > $ cat /sys/devices/system/cpu/cpu0/modalias
> > cat: /sys/devices/system/cpu/cpu0/modalias: No such file or
> > directory
> > $ cat /sys/devices/system/cpu/cpu0/uevent
> > DRIVER=processor
> > MODALIAS=cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,00E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,012B,012D,0140
> >
> > So there is no modalias file, but uevent contains MODALIAS line.
> >
> > > > What userspace application should use for reading
> > > > modalias=20 string? File modalias or file uevent?
> > >
> > > The cpu modalias is used to trigger loading of some
> > > CPU-specific modules upfront IIRC. So yes, it is special.
> > >
> > > My advice would be to follow udev here.
> >
> > Yes, I know. For some reasons coretemp.ko is not automatically
> > loaded. I do not know why and I started investigating it. And I
> > found above inconsistency in modalias and uevent...
> >
> > $ modinfo coretemp
> > ...
> > alias: cpu:type:x86,ven0000fam*mod*:feature:*00E7*
>
> That may be a udev issue. See
>
> http://lists.freedesktop.org/archives/systemd-devel/2013-July/012165.html
And it was fixed in udev quite some time ago.
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Missing MODALIAS in /sys/devices/system/cpu/uevent
2014-11-27 20:59 ` Rafael J. Wysocki
@ 2014-11-27 21:00 ` Rafael J. Wysocki
2014-11-27 20:43 ` Pali Rohár
0 siblings, 1 reply; 7+ messages in thread
From: Rafael J. Wysocki @ 2014-11-27 21:00 UTC (permalink / raw)
To: Pali Rohár; +Cc: Greg Kroah-Hartman, Len Brown, linux-acpi, linux-kernel
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On Thursday, November 27, 2014 09:59:03 PM Rafael J. Wysocki wrote:
> On Thursday, November 27, 2014 09:56:56 PM Rafael J. Wysocki wrote:
> > On Thursday, November 27, 2014 09:24:30 PM Pali Rohár wrote:
> > > On Thursday 27 November 2014 21:39:42 Rafael J. Wysocki wrote:
> > > > On Thursday, November 27, 2014 09:01:11 PM Pali Rohár wrote:
> > > > > --nextPart2712852.Yg3XtZvm05
> > > > > Content-Type: Text/Plain;
> > > > >
> > > > > charset="utf-8"
> > > > >
> > > > > Content-Transfer-Encoding: quoted-printable
> > > > >
> > > > > Hello,
> > > > >
> > > > > on 3.18-rc5 I have empty cpu uevent file, but modalias file
> > > > > is=20 populated. See:
> > > > >
> > > > > $ cat /sys/devices/system/cpu/uevent=20
> > > > > $ cat /sys/devices/system/cpu/modalias=20
> > > > > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0
> > > > > 003,0004,0005,0=
> > > > > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,
> > > > > 0015,0016,0017,0=
> > > > > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,
> > > > > 0068,006B,006C,0=
> > > > > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,
> > > > > 0082,0083,0084,0=
> > > > > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,
> > > > > 0094,0095,0096,0=
> > > > > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,
> > > > > 00E3,00E5,00E6,0=
> > > > > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,
> > > > > 0128,0129,012A,0= 12B,012D,0140
> > > > >
> > > > > =46or all other devices in /sys/devices/ which have
> > > > > modalias=20 content there is also MODALIAS=3D line in
> > > > > uevent file.
> > > >
> > > > /sys/devices/system/cpu/ is not a device. It is a "collection
> > > > of all CPUs".
> > > >
> > >
> > > Ok. But why that inconsistency (missing MODALIAS line)?
> > >
> > > > > Is cpu device special? Or why it is only one device which
> > > > > has=20 modalias file but is missing MODALIAS=3D line in
> > > > > uevent file?
> > > >
> > > > Look into the uevent files under /sys/devices/system/cpu/cpu0/
> > > > etc.
> > > >
> > >
> > > $ cat /sys/devices/system/cpu/cpu0/modalias
> > > cat: /sys/devices/system/cpu/cpu0/modalias: No such file or
> > > directory
> > > $ cat /sys/devices/system/cpu/cpu0/uevent
> > > DRIVER=processor
> > > MODALIAS=cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,00E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,012B,012D,0140
> > >
> > > So there is no modalias file, but uevent contains MODALIAS line.
> > >
> > > > > What userspace application should use for reading
> > > > > modalias=20 string? File modalias or file uevent?
> > > >
> > > > The cpu modalias is used to trigger loading of some
> > > > CPU-specific modules upfront IIRC. So yes, it is special.
> > > >
> > > > My advice would be to follow udev here.
> > >
> > > Yes, I know. For some reasons coretemp.ko is not automatically
> > > loaded. I do not know why and I started investigating it. And I
> > > found above inconsistency in modalias and uevent...
> > >
> > > $ modinfo coretemp
> > > ...
> > > alias: cpu:type:x86,ven0000fam*mod*:feature:*00E7*
> >
> > That may be a udev issue. See
> >
> > http://lists.freedesktop.org/archives/systemd-devel/2013-July/012165.html
>
> And it was fixed in udev quite some time ago.
By this commit:
http://cgit.freedesktop.org/systemd/systemd/commit/?id=bf7f800f2b3e93ccd1229d4717166f3a4d3af72f
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^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-11-27 20:43 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
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2014-11-27 20:01 Missing MODALIAS in /sys/devices/system/cpu/uevent Pali Rohár
2014-11-27 20:39 ` Rafael J. Wysocki
2014-11-27 20:24 ` Pali Rohár
2014-11-27 20:56 ` Rafael J. Wysocki
2014-11-27 20:59 ` Rafael J. Wysocki
2014-11-27 21:00 ` Rafael J. Wysocki
2014-11-27 20:43 ` Pali Rohár
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