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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.

/*
 * File:         arch/blackfin/mach-common/cacheinit.S
 * Based on:
 * Author:       LG Soft India
 *
 * Created:      ?
 * Description:  cache initialization
 *
 * Modified:
 *               Copyright 2004-2006 Analog Devices Inc.
 *
 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
 *
 * 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, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/* This function sets up the data and instruction cache. The
 * tables like icplb table, dcplb table and Page Descriptor table
 * are defined in cplbtab.h. You can configure those tables for
 * your suitable requirements
 */

#include <linux/linkage.h>
#include <asm/blackfin.h>

.text

#ifdef ANOMALY_05000125
#if defined(CONFIG_BLKFIN_CACHE)
ENTRY(_bfin_write_IMEM_CONTROL)

	/* Enable Instruction Cache */
	P0.l = (IMEM_CONTROL & 0xFFFF);
	P0.h = (IMEM_CONTROL >> 16);

	/* Anomaly 05000125 */
	CLI R1;
	SSYNC;		/* SSYNC required before writing to IMEM_CONTROL. */
	.align 8;
	[P0] = R0;
	SSYNC;
	STI R1;
	RTS;

ENDPROC(_bfin_write_IMEM_CONTROL)
#endif

#if defined(CONFIG_BLKFIN_DCACHE)
ENTRY(_bfin_write_DMEM_CONTROL)
	P0.l = (DMEM_CONTROL & 0xFFFF);
	P0.h = (DMEM_CONTROL >> 16);

	CLI R1;
	SSYNC;		/* SSYNC required before writing to DMEM_CONTROL. */
	.align 8;
	[P0] = R0;
	SSYNC;
	STI R1;
	RTS;

ENDPROC(_bfin_write_DMEM_CONTROL)
#endif

#endif