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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.

/*
 * SPU file system
 *
 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
 *
 * Author: Arnd Bergmann <arndb@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/list.h>
#include <linux/slab.h>

#include "spufs.h"

struct spu_gang *alloc_spu_gang(void)
{
	struct spu_gang *gang;

	gang = kzalloc(sizeof *gang, GFP_KERNEL);
	if (!gang)
		goto out;

	kref_init(&gang->kref);
	mutex_init(&gang->mutex);
	mutex_init(&gang->aff_mutex);
	INIT_LIST_HEAD(&gang->list);
	INIT_LIST_HEAD(&gang->aff_list_head);

out:
	return gang;
}

static void destroy_spu_gang(struct kref *kref)
{
	struct spu_gang *gang;
	gang = container_of(kref, struct spu_gang, kref);
	WARN_ON(gang->contexts || !list_empty(&gang->list));
	kfree(gang);
}

struct spu_gang *get_spu_gang(struct spu_gang *gang)
{
	kref_get(&gang->kref);
	return gang;
}

int put_spu_gang(struct spu_gang *gang)
{
	return kref_put(&gang->kref, &destroy_spu_gang);
}

void spu_gang_add_ctx(struct spu_gang *gang, struct spu_context *ctx)
{
	mutex_lock(&gang->mutex);
	ctx->gang = get_spu_gang(gang);
	list_add(&ctx->gang_list, &gang->list);
	gang->contexts++;
	mutex_unlock(&gang->mutex);
}

void spu_gang_remove_ctx(struct spu_gang *gang, struct spu_context *ctx)
{
	mutex_lock(&gang->mutex);
	WARN_ON(ctx->gang != gang);
	if (!list_empty(&ctx->aff_list)) {
		list_del_init(&ctx->aff_list);
		gang->aff_flags &= ~AFF_OFFSETS_SET;
	}
	list_del_init(&ctx->gang_list);
	gang->contexts--;
	mutex_unlock(&gang->mutex);

	put_spu_gang(gang);
}