-> rpm -q --changelog kernel-2.6.8-1.610 | head
* Tue Oct 12 2004 Dave Jones <email@example.com>
- Rebase to 2.6.9-rc4-bk1
As you can see, the kernel is quite new. The newer kernel (-1.624) is 'newer', but cannot be used due to a bug (see bugzilla). Do not use 624, however the 610 kernel is much newer than 2.6.9-rc3, and is built very closely from this source release, there are a total of 52 patches applied to the kernel source, many of them originating from much earlier kernel sources (2.6.0-x) that Redhat has been using for a long period (for instance Patch515: linux-2.6.0-exec-shield.patch) or which are for specific issues in building the kernel on various architectures.
The kernel is numbered in 2.6.8-x because 2.6.9 is not released (officially) and therefore a kernel should not be numbered 2.6.9. Redhat has been doing that for millennia.
- Andrew <firstname.lastname@example.org>
No one now has, and no one will ever again get, the big picture. - Daniel Geer