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[SOLVED] gentoo-sources-4.4.21 restarts kernel config
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jannis
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PostPosted: Sat Oct 01, 2016 5:56 pm    Post subject: [SOLVED] gentoo-sources-4.4.21 restarts kernel config Reply with quote

Hi, today I updated gentoo-sources on my nas (amd64 stable) from 4.4.6 to 4.4.21. However, "make oldconfig" resets the configuration and I have to start anew:

Code:
nas16 linux-4.4.21-gentoo # uname -a
Linux nas16 4.4.6-gentoo #3 SMP Sat Jun 4 10:08:01 CEST 2016 x86_64 Intel(R) Core(TM) i3-6300T CPU @ 3.30GHz GenuineIntel GNU/Linux
nas16 linux-4.4.21-gentoo # zcat /proc/config.gz > .config
nas16 linux-4.4.21-gentoo # head .config
#
# Automatically generated file; DO NOT EDIT.
# Linux/x86 4.4.6-gentoo Kernel Configuration
#

#
# Gentoo Linux
#
CONFIG_GENTOO_LINUX=y
CONFIG_GENTOO_LINUX_UDEV=y
nas16 linux-4.4.21-gentoo # make oldconfig
scripts/kconfig/conf  --oldconfig Kconfig
*
* Restart config...


anyone knows why this happens without the kernel having new features (it's still 4.4)?
and how I can re-use my config with the new kernel?

My kernel config from gentoo-source-4.4.6 is here: https://paste.pound-python.org/show/vdvIGZERHrUqfHcgo7II/

*UPDATE*: I just updated gentoo-source-4.4.6 to 4.4.21 in a VirtualBox-VM I have since some months and I don't have the problem there. Is there a way to find out WHY the configuration is restarted exactly?


Last edited by jannis on Fri Oct 07, 2016 1:54 pm; edited 1 time in total
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sebB
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PostPosted: Sun Oct 02, 2016 11:18 am    Post subject: Reply with quote

Quote:
nas16 linux-4.4.21-gentoo # zcat /proc/config.gz > .config

Why don't you do this from 4.4.6?

Have you try, simply copy the copy the .config from 4.4.6 to 4.4.21 and make oldconfig?
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jannis
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PostPosted: Mon Oct 03, 2016 4:59 pm    Post subject: Reply with quote

Hi sebB, thanks for your answer. I'm doing all this while version 4.4.6 is running, the thing you see before the "#" is the current directory. "/proc/config.gz" is configuration of the currently running kernel (4.4.6) and is saved in the directory of linux version 4.4.21. Copying the .config-file from the old kernel directory has the same result.
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iq180
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PostPosted: Tue Oct 04, 2016 8:55 am    Post subject: Reply with quote

jannis wrote:
Hi sebB, thanks for your answer. I'm doing all this while version 4.4.6 is running, the thing you see before the "#" is the current directory. "/proc/config.gz" is configuration of the currently running kernel (4.4.6) and is saved in the directory of linux version 4.4.21. Copying the .config-file from the old kernel directory has the same result.


Try
Code:
zcat /proc/config.gz > /etc/kernels/kernel-config-x86_64-4.4.21-gentoo
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cboldt
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PostPosted: Tue Oct 04, 2016 10:28 am    Post subject: Reply with quote

I have always used `make oldconfig` when moving from one kernel to a newer one, but for no reason in particular, when going form 4.4.6 to 4.4.21, used `make olddefconfig`. It worked.

I just now tried a fresh `cd /usr/src/linux-4.4.21-gentoo ; cp ../linux-4.4.6-gentoo/.config . ; make oldconfig` and that worked too. I was not prompted for any new settings, and the `make oldconfig` command wrote a .config for the 4.4.21 kernel.

Code:
/usr/src/linux-4.4.21-gentoo # make oldconfig
scripts/kconfig/conf  --oldconfig Kconfig
#
# configuration written to .config
#


The "Restart config" message comes from the file "scripts/kconfig/conf.c" I have not sussed out what causes that message to appear.

Also FWIW, I used the `zcat /proc/config.gz > .config
This also worked, no "Restart config" message appeared. I wonder if you actually have a 4.4.6 .config file in /usr/src/linux-4.4.21-gentoo

Edit to add, I see you appear to have a .config file, based on your `head` command output. Maybe there is a permissions issue, but I have no idea how that might come to exist.
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jannis
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PostPosted: Fri Oct 07, 2016 1:52 pm    Post subject: Reply with quote

Alright, I've sorted it out:
The reason for the problem is commit 5aeaf8bd6c6a3f29a1ab55987c10741ef984ea52 ( http://lkml.kernel.org/r/1454499225-21544-2-git-send-email-bp@alien8.de ) that happened between 4.4.6 and 4.4.7 in combination with kernel configs that are NOT using initrds.

To solve the problem:

  • Go to the kernel sources of 4.4.6
  • Run make menuconfig there and enable the initrd option
  • Copy the resulting .config to the sources version 4.4.21
  • Run make menuconfig (which implies make oldconfig and won't restart/reset the config this time) and disable the initrd option again
  • Build your kernel
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