Comment 2 for bug 289683

I've attached a debdiff to do extactly this (an ABI blacklisting was required for XFS, which falls in line with the main kernel tree). The debdiff is massive because of a folder rename and an update of the config files (as per updateconfigs), here's the relative parts of the debdiff. The kernel source package is available in the following, which may be easier to upload then manually respinning the source tarball (https://edge.launchpad.net/~ubuntu-backports-testers/+archive).

diff -Nru linux-rt-2.6.27/debian/abi/perm-blacklist linux-rt-2.6.27/debian/abi/perm-blacklist
--- linux-rt-2.6.27/debian/abi/perm-blacklist 2008-10-01 11:13:33.000000000 -0400
+++ linux-rt-2.6.27/debian/abi/perm-blacklist 2008-10-26 20:41:08.000000000 -0400
@@ -1,2 +1,3 @@
 M: ubuntu/misc/wireless/p80211/p80211
 M: sound/pci/emu10k1/snd-emu10k1
+M: fs/xfs/xfs
diff -Nru linux-rt-2.6.27/debian/changelog linux-rt-2.6.27/debian/changelog
--- linux-rt-2.6.27/debian/changelog 2008-10-19 23:34:10.000000000 -0400
+++ linux-rt-2.6.27/debian/changelog 2008-10-26 20:47:50.000000000 -0400
@@ -1,3 +1,11 @@
+linux-rt (2.6.27-3.8) intrepid; urgency=low
+
+ * Blacklisted XFS to prevent an ABI bump
+ - This is based off git commit 21c69ea60244403e503f148cd29d89df85eb0908
+ from ubuntu-intrepid.git (LP: #289683)
+
+ -- Michael Casadevall <email address hidden> Sun, 26 Oct 2008 20:46:33 -0400
+
 linux-rt (2.6.27-3.7) intrepid; urgency=low

   * Synced against linux-source-2.6.27 2.6.27-7.12