From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pali =?utf-8?q?Roh=C3=A1r?= Subject: Re: Missing MODALIAS in /sys/devices/system/cpu/uevent Date: Thu, 27 Nov 2014 21:24:30 +0100 Message-ID: <201411272124.30618@pali> References: <201411272101.11811@pali> <1716071.jpYXuFBQgb@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart5330775.Nd4Fvu8qSF"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-wg0-f42.google.com ([74.125.82.42]:61218 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752384AbaK0UYd (ORCPT ); Thu, 27 Nov 2014 15:24:33 -0500 In-Reply-To: <1716071.jpYXuFBQgb@vostro.rjw.lan> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Rafael J. Wysocki" Cc: Greg Kroah-Hartman , Len Brown , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org --nextPart5330775.Nd4Fvu8qSF Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Thursday 27 November 2014 21:39:42 Rafael J. Wysocki wrote: > On Thursday, November 27, 2014 09:01:11 PM Pali Roh=C3=A1r wrote: > > --nextPart2712852.Yg3XtZvm05 > > Content-Type: Text/Plain; > >=20 > > charset=3D"utf-8" > >=20 > > Content-Transfer-Encoding: quoted-printable > >=20 > > Hello, > >=20 > > on 3.18-rc5 I have empty cpu uevent file, but modalias file > > is=3D20 populated. See: > >=20 > > $ cat /sys/devices/system/cpu/uevent=3D20 > > $ cat /sys/devices/system/cpu/modalias=3D20 > > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0 > > 003,0004,0005,0=3D > > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013, > > 0015,0016,0017,0=3D > > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D, > > 0068,006B,006C,0=3D > > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081, > > 0082,0083,0084,0=3D > > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093, > > 0094,0095,0096,0=3D > > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1, > > 00E3,00E5,00E6,0=3D > > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127, > > 0128,0129,012A,0=3D 12B,012D,0140 > >=20 > > =3D46or all other devices in /sys/devices/ which have > > modalias=3D20 content there is also MODALIAS=3D3D line in > > uevent file. >=20 > /sys/devices/system/cpu/ is not a device. It is a "collection > of all CPUs". >=20 Ok. But why that inconsistency (missing MODALIAS line)? > > Is cpu device special? Or why it is only one device which > > has=3D20 modalias file but is missing MODALIAS=3D3D line in > > uevent file? >=20 > Look into the uevent files under /sys/devices/system/cpu/cpu0/ > etc. >=20 $ cat /sys/devices/system/cpu/cpu0/modalias cat: /sys/devices/system/cpu/cpu0/modalias: No such file or=20 directory $ cat /sys/devices/system/cpu/cpu0/uevent=20 DRIVER=3Dprocessor MODALIAS=3Dcpu: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=3D20 string? File modalias or file uevent? >=20 > The cpu modalias is used to trigger loading of some > CPU-specific modules upfront IIRC. So yes, it is special. >=20 > My advice would be to follow udev here. Yes, I know. For some reasons coretemp.ko is not automatically=20 loaded. I do not know why and I started investigating it. And I=20 found above inconsistency in modalias and uevent... $ modinfo coretemp =2E.. alias: cpu:type:x86,ven0000fam*mod*:feature:*00E7* =2D-=20 Pali Roh=C3=A1r pali.rohar@gmail.com --nextPart5330775.Nd4Fvu8qSF Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlR3iH4ACgkQi/DJPQPkQ1JduQCaAyEqduHPi7ZT+6gbtRRZRa6o rFMAn02I6mY32wV6boxt7o4r1Cxr7eYR =kEKD -----END PGP SIGNATURE----- --nextPart5330775.Nd4Fvu8qSF--