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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.

/*
 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/mlx4/driver.h>

#include "mlx4.h"

struct mlx4_device_context {
	struct list_head	list;
	struct mlx4_interface  *intf;
	void		       *context;
};

static LIST_HEAD(intf_list);
static LIST_HEAD(dev_list);
static DEFINE_MUTEX(intf_mutex);

static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
{
	struct mlx4_device_context *dev_ctx;

	dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
	if (!dev_ctx)
		return;

	dev_ctx->intf    = intf;
	dev_ctx->context = intf->add(&priv->dev);

	if (dev_ctx->context) {
		spin_lock_irq(&priv->ctx_lock);
		list_add_tail(&dev_ctx->list, &priv->ctx_list);
		spin_unlock_irq(&priv->ctx_lock);
	} else
		kfree(dev_ctx);
}

static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
{
	struct mlx4_device_context *dev_ctx;

	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
		if (dev_ctx->intf == intf) {
			spin_lock_irq(&priv->ctx_lock);
			list_del(&dev_ctx->list);
			spin_unlock_irq(&priv->ctx_lock);

			intf->remove(&priv->dev, dev_ctx->context);
			kfree(dev_ctx);
			return;
		}
}

int mlx4_register_interface(struct mlx4_interface *intf)
{
	struct mlx4_priv *priv;

	if (!intf->add || !intf->remove)
		return -EINVAL;

	mutex_lock(&intf_mutex);

	list_add_tail(&intf->list, &intf_list);
	list_for_each_entry(priv, &dev_list, dev_list)
		mlx4_add_device(intf, priv);

	mutex_unlock(&intf_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(mlx4_register_interface);

void mlx4_unregister_interface(struct mlx4_interface *intf)
{
	struct mlx4_priv *priv;

	mutex_lock(&intf_mutex);

	list_for_each_entry(priv, &dev_list, dev_list)
		mlx4_remove_device(intf, priv);

	list_del(&intf->list);

	mutex_unlock(&intf_mutex);
}
EXPORT_SYMBOL_GPL(mlx4_unregister_interface);

void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_event type,
			 int subtype, int port)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_device_context *dev_ctx;
	unsigned long flags;

	spin_lock_irqsave(&priv->ctx_lock, flags);

	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
		if (dev_ctx->intf->event)
			dev_ctx->intf->event(dev, dev_ctx->context, type,
					     subtype, port);

	spin_unlock_irqrestore(&priv->ctx_lock, flags);
}

int mlx4_register_device(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_interface *intf;

	mutex_lock(&intf_mutex);

	list_add_tail(&priv->dev_list, &dev_list);
	list_for_each_entry(intf, &intf_list, list)
		mlx4_add_device(intf, priv);

	mutex_unlock(&intf_mutex);
	mlx4_start_catas_poll(dev);

	return 0;
}

void mlx4_unregister_device(struct mlx4_dev *dev)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_interface *intf;

	mlx4_stop_catas_poll(dev);
	mutex_lock(&intf_mutex);

	list_for_each_entry(intf, &intf_list, list)
		mlx4_remove_device(intf, priv);

	list_del(&priv->dev_list);

	mutex_unlock(&intf_mutex);
}