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Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/*
 * File:         Documentation/blackfin/Filesystems
 * Based on:
 * Author:
 *
 * Created:
 * Description:  This file contains the simple DMA Implementation for Blackfin
 *
 * Rev:          $Id: Filesystems,v 1.4 2007/09/12 17:09:56 tes.longdrop.melbourne.sgi.com Exp $
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 */

		How to mount the root file system in uClinux/Blackfin
		-----------------------------------------------------

1	Mounting EXT3 File system.
	------------------------

	Creating an EXT3 File system for uClinux/Blackfin:


Please follow the steps to form the EXT3 File system and mount the same as root
file system.

a	Make an ext3 file system as large as you want the final root file
	system.

		mkfs.ext3  /dev/ram0 <your-rootfs-size-in-1k-blocks>

b	Mount this Empty file system on a free directory as:

		mount -t ext3 /dev/ram0  ./test
			where ./test is the empty directory.

c	Copy your root fs directory that you have so carefully made over.

		cp -af  /tmp/my_final_rootfs_files/* ./test

		(For ex: cp -af uClinux-dist/romfs/* ./test)

d	If you have done everything right till now you should be able to see
	the required "root" dir's (that's etc, root, bin, lib, sbin...)

e	Now unmount the file system

		umount  ./test

f	Create the root file system image.

		dd if=/dev/ram0 bs=1k count=<your-rootfs-size-in-1k-blocks> \
		> ext3fs.img


Now you have to tell the kernel that will be mounting this file system as
rootfs.
So do a make menuconfig under kernel and select the Ext3 journaling file system
support under File system --> submenu.


2.	Mounting EXT2 File system.
	-------------------------

By default the ext2 file system image will be created if you invoke make from
the top uClinux-dist directory.


3.	Mounting CRAMFS File System
	----------------------------

To create a CRAMFS file system image execute the command

	mkfs.cramfs ./test cramfs.img

	where ./test is the target directory.


4.	Mounting ROMFS File System
	--------------------------

To create a ROMFS file system image execute the command

	genromfs -v -V "ROMdisk" -f romfs.img -d ./test

	where ./test is the target directory


5.	Mounting the JFFS2 Filesystem
	-----------------------------

To create a compressed JFFS filesystem (JFFS2), please execute the command

	mkfs.jffs2 -d ./test -o jffs2.img

	where ./test is the target directory.

However, please make sure the following is in your kernel config.

/*
 * RAM/ROM/Flash chip drivers
 */
#define CONFIG_MTD_CFI 1
#define CONFIG_MTD_ROM 1
/*
 * Mapping drivers for chip access
 */
#define CONFIG_MTD_COMPLEX_MAPPINGS 1
#define CONFIG_MTD_BF533 1
#undef CONFIG_MTD_UCLINUX

Through the u-boot boot loader, use the jffs2.img in the corresponding
partition made in linux-2.6.x/drivers/mtd/maps/bf533_flash.c.

NOTE - 	Currently the Flash driver is available only for EZKIT. Watch out for a
	STAMP driver soon.


6. 	Mounting the NFS File system
	-----------------------------

	For mounting the NFS please do the following in the kernel config.

	In Networking Support --> Networking options --> TCP/IP networking -->
		IP: kernel level autoconfiguration

	Enable BOOTP Support.

	In Kernel hacking --> Compiled-in kernel boot parameter add the following

		root=/dev/nfs rw ip=bootp

	In File system --> Network File system, Enable

		NFS file system support --> NFSv3 client support
		Root File system on NFS

	in uClibc menuconfig, do the following
	In Networking Support
		enable Remote Procedure Call (RPC) support
			Full RPC Support

	On the Host side, ensure that /etc/dhcpd.conf looks something like this

		ddns-update-style ad-hoc;
		allow bootp;
		subnet 10.100.4.0 netmask 255.255.255.0 {
		default-lease-time 122209600;
		max-lease-time 31557600;
		group {
			host bf533 {
				hardware ethernet 00:CF:52:49:C3:01;
				fixed-address 10.100.4.50;
				option root-path "/home/nfsmount";
			}
		}

	ensure that /etc/exports looks something like this
		/home/nfsmount *(rw,no_root_squash,no_all_squash)

	 run the following commands as root (may differ depending on your
	 distribution) :
		-  service nfs start
		-  service portmap start
		-  service dhcpd start
		-  /usr/sbin/exportfs