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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: Since when does module-rebuild delete modules for previous kernel
 version?
Date: Sat, 10 Jul 2021 11:22:38 +0300
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On 08/07/2021 02:09, Nikos Chantziaras wrote:
> So I just noticed that when I run:
> 
> emerge @module-rebuild
> 
> after having installed a kernel update, the kernel modules of the 
> previous kernel version are being deleted. I am sure this didn't use to 
> be the case.
Found the issue. On my new system, I had this in my make.conf:

   UNINSTALL_IGNORE="/usr/src"

because /usr/src is a symlink to a directory on my HDD (as I don't want 
to write all that data to my SSD.) Portage would bark about it during 
depclean if I don't put that in UNINSTALL_IGNORE.

 From "man make.conf":

   UNINSTALL_IGNORE = [space delimited list of fnmatch patterns]

   This variable prevents uninstallation of files that match
   specific fnmatch(3) patterns. [...] Defaults to
   "/lib/modules/*".

Right. However, it's obvious I've hit a portage inconsistency here. For 
example, when I use:

   CONFIG_PROTECT="blah"

in make.conf, "blah" is appended to CONFIG_PROTECT. But for whatever 
reason, this is not the case for UNINSTALL_IGNORE. It completely nukes 
the default value instead. I had to change this to:

   UNINSTALL_IGNORE="${UNINSTALL_IGNORE} /usr/src"

and now all is fine.