On Mon, 02 Sep 2019 15:42:19 +0300, Anatoly Pugachev said:

> is it intentionally that you use
>
> yes "" | make oldconfig
>
> instead of
>
> make olddefconfig

They do something different.  'olddefconfig' just takes the platform or
architecture defconfig and updates it for any new CONFIG_* variables added
since the last time the defconfig was updated in the tree.

yes "" | make oldconfig  does the same updating for new CONFIG_* variables, but
starts with the most recent .config - which produces wildly different results
if the .config had previously been minimized by 'make localmodconfig' or other
similar techniques.