linux-kernel - Re: coretemp.ko not auto-loaded on 3.11.x

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Message-ID: <CAHVUoiTvA6Eg49GvWM+eb4yQJymUKetMzC9Qm6S3U--5xz8rLA@mail.gmail.com>
Date:	Tue, 1 Oct 2013 01:29:50 +0300
From:	Brian Gitonga Marete <marete@...hnix.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Thomas Renninger <trenn@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: coretemp.ko not auto-loaded on 3.11.x

On Tue, Oct 1, 2013 at 12:25 AM, Brian Gitonga Marete
<marete@...hnix.com> wrote:
> Hello all,
>
> Some time ago, an enhancement was made to the kernel that caused
> coretemp.ko (as well as other cpu-specific drivers) to be auto-loaded.
>
> This has broken for me in 3.11.x. It works fine on 3.10.x.
>
> Please see the attached kernel config and let me know if I left out
> something notwithstanding doing a `sillentoldconfig' from my 3.10.x
> config, which does not exhibit the problem.
>

Some further information which upon some research, may be useful:

Kernel is 3.11.2 (But misbehavior first seen with 3.11.0)

$ cat /sys/devices/system/cpu/modalias
x86cpu:vendor:0000:family:0006:model:0025: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,0034,003B,003D,0068,006B,006C,006D,006F,0070,0072,0074,0075,0076,0078,007C,0080,0082,0083,0084,0085,0087,0088,0089,008D,008E,008F,0091,0093,0094,0097,00C0,00E0,00E1,00E7,0100,0101,0102,0103,0104

$ modinfo coretemp
filename:       /lib/modules/3.11.2/kernel/drivers/hwmon/coretemp.ko
license:        GPL
description:    Intel Core temperature monitor
author:         Rudolf Marek <r.marek@...embler.cz>
srcversion:     31B63A96FD9FD13CDDBDF32
alias:          x86cpu:vendor:0000:family:*:model:*:feature:*00E7*
depends:
intree:         Y
vermagic:       3.11.2 SMP mod_unload modversions
parm:           tjmax:TjMax value in degrees Celsius (int)

I have UDEV 175 from Ubuntu 12.04.

The module alias seems to match that in cat
/sys/devices/system/cpu/modalias, so udev should be able to probe for
and load coretemp.ko, but that is not happening, which is strange to
me.

I also note that microcode.ko, which is handled by the same mechanism
for auto-loading based on CPUID, is no longer auto-loaded in kernel
3.11.x.

I have added Thomas Renninger and Greg Kroah-Hartman to the thread CC.

Thanks.

BGM.
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