It bears re-remembering: kernel source packages...

[sundialsvc4]

Okay, I was doing some cleanup and I was "re-reminded" of this little fact...

1. Kernel-source packages are, of course, cumulative. In other words (and for very obvious reasons) installing a new package doesn't remove the old one.
2. Nevertheless, portage remembers every version that was ever loaded...
3. Therefore, the "right way" to get rid of unused kernel-source versions is to un-merge the package.

There was a rather-amazing amount of "detrius" in the kernel-source package list, because ... mea culpa ... I'd just rm -f the unwanted kernel-source directories. Oops. I mean, it doesn't hurt anything as far as I know, but you probably don't want Portage thinking that stuff is still on your system when it's not.

[Sadako]

I used to do that too (simply rm /usr/src/whatever), but it's a habit I broke a good while ago.

Good thing is portage didn't seem to complain when you "emerge -C" the old versions. even though the files are already gone...

The "-P" or "--prune" emerge flag is useful here, as it keeps the most current version of slotted packages and removes the rest.
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[desultory]

Moved from Kernel & Hardware to Documentation, Tips & Tricks.