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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:

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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 - 2006 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.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 of the License, 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.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: eeprom_93cx6
	Abstract: EEPROM reader datastructures for 93cx6 chipsets.
	Supported chipsets: 93c46 & 93c66.
 */

/*
 * EEPROM operation defines.
 */
#define PCI_EEPROM_WIDTH_93C46	6
#define PCI_EEPROM_WIDTH_93C66	8
#define PCI_EEPROM_WIDTH_OPCODE	3
#define PCI_EEPROM_WRITE_OPCODE	0x05
#define PCI_EEPROM_READ_OPCODE	0x06
#define PCI_EEPROM_EWDS_OPCODE	0x10
#define PCI_EEPROM_EWEN_OPCODE	0x13

/**
 * struct eeprom_93cx6 - control structure for setting the commands
 * for reading the eeprom data.
 * @data: private pointer for the driver.
 * @register_read(struct eeprom_93cx6 *eeprom): handler to
 * read the eeprom register, this function should set all reg_* fields.
 * @register_write(struct eeprom_93cx6 *eeprom): handler to
 * write to the eeprom register by using all reg_* fields.
 * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
 * @reg_data_in: register field to indicate data input
 * @reg_data_out: register field to indicate data output
 * @reg_data_clock: register field to set the data clock
 * @reg_chip_select: register field to set the chip select
 *
 * This structure is used for the communication between the driver
 * and the eeprom_93cx6 handlers for reading the eeprom.
 */
struct eeprom_93cx6 {
	void *data;

	void (*register_read)(struct eeprom_93cx6 *eeprom);
	void (*register_write)(struct eeprom_93cx6 *eeprom);

	int width;

	char reg_data_in;
	char reg_data_out;
	char reg_data_clock;
	char reg_chip_select;
};

extern void eeprom_93cx6_read(struct eeprom_93cx6 *eeprom,
	const u8 word, u16 *data);
extern void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom,
	const u8 word, __le16 *data, const u16 words);