Description of problem:
At some point during F17 release, the NFS-related kernel modules changed so that a new nfsv3 module needs to be loaded to mount an NFS export. The initramfs created by dracut does not include the newer modules (in my case "nfsv3" and "nfs_acl" are required) and a host that attempts to mount its root filesystem over NFS fails with the message "mount.nfs: Protocol not supported".

It can be worked around by re-running dracut with the option '--add-drivers "nfsv3 nfs_acl"' after installing the new kernel.

It looks like this is already fixed in dracut (commit ba111df2b99f9f1dc5c51442ad92bcefbf16bd91) and part of release dracut-024, but that version is only being built for F18.

Version-Release number of selected component (if applicable):
Ok in 3.4.6-2.fc17.x86_64, definitely broken in 3.6.5-1.fc17.x86_64

How reproducible:
Every time

Steps to Reproduce:
1. Update to latest kernel package
2. Copy dracut-generated initramfs to tftp server
3. Configure pxelinux to use new initramfs
4. Reboot host
  
Actual results:
Host fails to boot with the error "mount.nfs: Protocol not supported"

Expected results:
Host boots