Its from the Gentoo handbook again.

Configuring the Modules

You should list the modules you want automatically loaded in /etc/modules.autoload.d/kernel-2.6. You can add extra options to the modules too if you want.

To view all available modules, run the following find command. Don't forget to substitute "<kernel version>" with the version of the kernel you just compiled:

Code Listing 5.1: Viewing all available modules

# find /lib/modules/<kernel version>/ -type f -iname '*.o' -or -iname '*.ko'

I've tried

(chroot) confused / # find /lib/modules/kernel-2.6.27/ -type f -iname '*.o' -or -iname '*.ko'
find: `/lib/modules/kernel-2.6.27/': No such file or directory (chroot) confused / # find /lib/modules/2.6.27/ -type f -iname '*.o' -or -iname '*.ko'
find: `/lib/modules/2.6.27/': No such file or directory (chroot) confused / # find /lib/modules/genkernel-2.6.27-gentoo-r8/ -type f -iname '*.o' -or -iname '*.ko'
find: `/lib/modules/genkernel-2.6.27-gentoo-r8/': No such file or directory
(chroot) confused / # find /lib/modules/kernel-2.6/ -type f -iname '*.o' -or -iname '*.ko'
find: `/lib/modules/kernel-2.6/': No such file or directory