Mike, I forward ported the patch to the git repo, but I need you to spin 4.5-2.base. We should prioritize this else we're going to get a bunch of bungs about how xattrs fails on tmpfs.
Mike, I updated 1500_XATTR_USER_PREFIX.patch for the 4.5 kernels and tested. They introduced `static const struct xattr_handler` which now contain the names of the xattrs on tmpfs as well as the set and get handlers. I've pushed to the linux-patches repo.
this is fixed in genpatches-4.5-2.base.tar.xz out with gentoo-sources-4.5.0-r1.ebuild