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In debian jessie, I've installed the linux source with:

sudo apt-get install linux-source

I obtain a file /usr/src/linux-source-3.16.tar.xz, I copy it under my home directory, change the ownership and extract it:

sudo cp /usr/src/linux-source-3.16.tar.xz /home/orto/src
cd /home/orto/src
sudo chown orto:orto linux-source-3.16.tar.xz
tar xvf linux-source-3.16.tar.xz

The I run make allnoconfig which according to make help should answers no to all options:

allnoconfig - New config where all options are answered with no

but if I count the number of yes answers with:

grep "=y" .config | wc -l

I obtain 6541 yes answers. Why?

Edit (1)

This problem doesn't appear with the vanilla kernel.

git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
cd linux-stable/
git checkout v3.16
make allnoconfig
grep "=y" .config | wc -l

I obtain only 193 yes answers.

Edit (2)

It appears that make allnoconfig generate the exact same .config file as make allyesconfig

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Debian patches the official kernel code heavily, including the config program [1]. This changes how make allyesconfig/allnoconfig behaves. Also a lot of Kconfig files are modified and certain symbols selected without explicitly asking the user.

If you remove all patches with quilt pop -a in the source code of the related Linux package (you can get it with apt-get source linux-source-3.16) you get the same behaviour as with the vanilla kernel.

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  • Do you think, that's a bug that should be reported? – Ortomala Lokni Jan 7 '16 at 10:48
  • You can report it with severity wishlist. – jofel Jan 7 '16 at 11:04
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make tinyconfig is what you want

https://tiny.wiki.kernel.org/

Edit: might only work on kernels >= 3.17

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  • In kernel 3.16, I obtain Makefile:548: recipe for target 'tinyconfig' failed – Ortomala Lokni Jan 7 '16 at 6:43
  • Any error messages before that? And read the link I posted, especially about CONFIG_EXPERT and CONFIG_EMBEDDED – Dominik R Jan 7 '16 at 8:55
  • No, and in 3.16 grep -R tinyconfig gives nothing. The problem is maybe coming from this patch? – Ortomala Lokni Jan 7 '16 at 9:11

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