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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) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Intel Corporation. All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, 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.
 *
 * $Id: ib_cache.h,v 1.13 2007/09/12 17:09:56 tes.longdrop.melbourne.sgi.com Exp $
 */

#ifndef _IB_CACHE_H
#define _IB_CACHE_H

#include <rdma/ib_verbs.h>

/**
 * ib_get_cached_gid - Returns a cached GID table entry
 * @device: The device to query.
 * @port_num: The port number of the device to query.
 * @index: The index into the cached GID table to query.
 * @gid: The GID value found at the specified index.
 *
 * ib_get_cached_gid() fetches the specified GID table entry stored in
 * the local software cache.
 */
int ib_get_cached_gid(struct ib_device    *device,
		      u8                   port_num,
		      int                  index,
		      union ib_gid        *gid);

/**
 * ib_find_cached_gid - Returns the port number and GID table index where
 *   a specified GID value occurs.
 * @device: The device to query.
 * @gid: The GID value to search for.
 * @port_num: The port number of the device where the GID value was found.
 * @index: The index into the cached GID table where the GID was found.  This
 *   parameter may be NULL.
 *
 * ib_find_cached_gid() searches for the specified GID value in
 * the local software cache.
 */
int ib_find_cached_gid(struct ib_device *device,
		       union ib_gid	*gid,
		       u8               *port_num,
		       u16              *index);

/**
 * ib_get_cached_pkey - Returns a cached PKey table entry
 * @device: The device to query.
 * @port_num: The port number of the device to query.
 * @index: The index into the cached PKey table to query.
 * @pkey: The PKey value found at the specified index.
 *
 * ib_get_cached_pkey() fetches the specified PKey table entry stored in
 * the local software cache.
 */
int ib_get_cached_pkey(struct ib_device    *device_handle,
		       u8                   port_num,
		       int                  index,
		       u16                 *pkey);

/**
 * ib_find_cached_pkey - Returns the PKey table index where a specified
 *   PKey value occurs.
 * @device: The device to query.
 * @port_num: The port number of the device to search for the PKey.
 * @pkey: The PKey value to search for.
 * @index: The index into the cached PKey table where the PKey was found.
 *
 * ib_find_cached_pkey() searches the specified PKey table in
 * the local software cache.
 */
int ib_find_cached_pkey(struct ib_device    *device,
			u8                   port_num,
			u16                  pkey,
			u16                 *index);

/**
 * ib_get_cached_lmc - Returns a cached lmc table entry
 * @device: The device to query.
 * @port_num: The port number of the device to query.
 * @lmc: The lmc value for the specified port for that device.
 *
 * ib_get_cached_lmc() fetches the specified lmc table entry stored in
 * the local software cache.
 */
int ib_get_cached_lmc(struct ib_device *device,
		      u8                port_num,
		      u8                *lmc);

#endif /* _IB_CACHE_H */