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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.

/*
 * include/asm-sparc64/xor.h
 *
 * High speed xor_block operation for RAID4/5 utilizing the
 * UltraSparc Visual Instruction Set and Niagara block-init
 * twin-load instructions.
 *
 * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz)
 * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * (for example /usr/src/linux/COPYING); if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <asm/spitfire.h>

extern void xor_vis_2(unsigned long, unsigned long *, unsigned long *);
extern void xor_vis_3(unsigned long, unsigned long *, unsigned long *,
		      unsigned long *);
extern void xor_vis_4(unsigned long, unsigned long *, unsigned long *,
		      unsigned long *, unsigned long *);
extern void xor_vis_5(unsigned long, unsigned long *, unsigned long *,
		      unsigned long *, unsigned long *, unsigned long *);

/* XXX Ugh, write cheetah versions... -DaveM */

static struct xor_block_template xor_block_VIS = {
        .name	= "VIS",
        .do_2	= xor_vis_2,
        .do_3	= xor_vis_3,
        .do_4	= xor_vis_4,
        .do_5	= xor_vis_5,
};

extern void xor_niagara_2(unsigned long, unsigned long *, unsigned long *);
extern void xor_niagara_3(unsigned long, unsigned long *, unsigned long *,
			  unsigned long *);
extern void xor_niagara_4(unsigned long, unsigned long *, unsigned long *,
			  unsigned long *, unsigned long *);
extern void xor_niagara_5(unsigned long, unsigned long *, unsigned long *,
			  unsigned long *, unsigned long *, unsigned long *);

static struct xor_block_template xor_block_niagara = {
        .name	= "Niagara",
        .do_2	= xor_niagara_2,
        .do_3	= xor_niagara_3,
        .do_4	= xor_niagara_4,
        .do_5	= xor_niagara_5,
};

#undef XOR_TRY_TEMPLATES
#define XOR_TRY_TEMPLATES				\
	do {						\
		xor_speed(&xor_block_VIS);		\
		xor_speed(&xor_block_niagara);		\
	} while (0)

/* For VIS for everything except Niagara.  */
#define XOR_SELECT_TEMPLATE(FASTEST) \
	((tlb_type == hypervisor && \
	  (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 || \
	   sun4v_chip_type == SUN4V_CHIP_NIAGARA2)) ? \
	 &xor_block_niagara : \
	 &xor_block_VIS)