This is a bit misleading. All of genkernel/, gentoo-kernel/, gentoo-kernel-bin/, gentoo-sources/, git-sources/, vanilla-kernel/ and vanilla-sources/ are all different packages for the same Linux Kernel. There are multiple slots per package for the various supported LTS versions of said kernel but they will all get +/- the same set of patches for these issues. There is some support for other kernels like Darwin, BSD and HURD but your millage will vary.
reply> There is some support for other kernels like Darwin, BSD and HURD but your millage will vary.
replyI believe at this writing only Linux and HURD are officially supported standalone. Which IMHO is sad because Gentoo kFreeBSD was really cool but oh well. There is still the Gentoo prefix project, though even there support for the BSDs is iffy:(
When I used Gentoo the normal was to install gentoo-sources, which gives you the kernel source code but doesn't compile it. You then have to compile and install the kernel yourself without any support from the package manager.
replyIf you're running on a different platform then perhaps you need the raspberrypi or asahi kernel