From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751663AbaK0Uhs (ORCPT ); Thu, 27 Nov 2014 15:37:48 -0500 Received: from v094114.home.net.pl ([79.96.170.134]:55913 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750994AbaK0Uhr (ORCPT ); Thu, 27 Nov 2014 15:37:47 -0500 From: "Rafael J. Wysocki" To: Pali =?ISO-8859-1?Q?Roh=E1r?= Cc: Greg Kroah-Hartman , Len Brown , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Missing MODALIAS in /sys/devices/system/cpu/uevent Date: Thu, 27 Nov 2014 21:59:03 +0100 Message-ID: <9796230.2QoPTQHj6x@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/3.16.0-rc5+; KDE/4.11.5; x86_64; ; ) In-Reply-To: <1892529.CzZLJuFW6x@vostro.rjw.lan> References: <201411272101.11811@pali> <201411272124.30618@pali> <1892529.CzZLJuFW6x@vostro.rjw.lan> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2576348.ZkNOnGKvHU"; micalg="pgp-sha256"; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nextPart2576348.ZkNOnGKvHU Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Thursday, November 27, 2014 09:56:56 PM Rafael J. Wysocki wrote: > On Thursday, November 27, 2014 09:24:30 PM Pali Roh=C3=A1r wrote: > > 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 > >=20 > > Ok. But why that inconsistency (missing MODALIAS line)? > >=20 > > > > 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 > >=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:,0000,0001,00= 02,0003,0004,0005,0006,0007,0008,0009,000B,000C,000D,000E,000F,0010,001= 1,0013,0015,0016,0017,0018,0019,001A,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,0= 08E,008F,0091,0093,0094,0095,0096,0097,0098,0099,009A,009B,009C,009D,00= 9E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,00E7,0100,0101,0102,0103,0104,012= 0,0121,0123,0124,0125,0127,0128,0129,012A,012B,012D,0140 > >=20 > > So there is no modalias file, but uevent contains MODALIAS line. > >=20 > > > > 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. > >=20 > > 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... > >=20 > > $ modinfo coretemp > > ... > > alias: cpu:type:x86,ven0000fam*mod*:feature:*00E7* >=20 > That may be a udev issue. See >=20 > http://lists.freedesktop.org/archives/systemd-devel/2013-July/012165.= html And it was fixed in udev quite some time ago. =2D-=20 I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. --nextPart2576348.ZkNOnGKvHU Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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