pci/kvm changes (mmap legacy_io support, pci quirks removing; kvm supporting vt-d driver).
ext4/ext3/ocfs2/ubifs/gfs2/nfs mods (e.g.,
ext4dev it's now ext4 (fs/Kconfig, fs/Makefile, fs/ext4/*), so no TEST_FILESYS anymore; error handling control option (i/o operations; buffer write errors don't get detected, if fsync() is not used, iow, determines whether to call printk() or to abort journalizing; however, ignoring will be set by default), (prominently fs/ext4/ext4.h); no HUGE_FILE flag auto-enabled; delayed allocation mode disabled (fs/ext4/inode.c).
default autodetection of a config option for raid configs.
some drivers had been held on place, aka staging.
grab the patch: http://kernel.org/pub/linux/kernel/v2.6/patch-2.6.28.bz2.