* 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 [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 198 bytes --] ^ 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 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 [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 198 bytes --] ^ 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. [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 836 bytes --] ^ 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. [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 836 bytes --] ^ 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 [-- Attachment #1: Type: text/plain, Size: 3934 bytes --] 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 [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 836 bytes --] ^ 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 [-- Attachment #2: This is a digitally signed message part. --] [-- Type: application/pgp-signature, Size: 198 bytes --] ^ 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 -- links below jump to the message on this page -- 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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