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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.

/*
 *  pSeries firmware setup code.
 *
 *  Portions from arch/powerpc/platforms/pseries/setup.c:
 *   Copyright (C) 1995  Linus Torvalds
 *   Adapted from 'alpha' version by Gary Thomas
 *   Modified by Cort Dougan (cort@cs.nmt.edu)
 *   Modified by PPC64 Team, IBM Corp
 *
 *  Portions from arch/powerpc/kernel/firmware.c
 *   Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
 *   Modifications for ppc64:
 *    Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
 *    Copyright (C) 2005 Stephen Rothwell, IBM Corporation
 *
 *  Copyright 2006 IBM Corporation.
 *
 * 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.
 */

#undef DEBUG

#include <asm/firmware.h>
#include <asm/prom.h>

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

typedef struct {
    unsigned long val;
    char * name;
} firmware_feature_t;

static __initdata firmware_feature_t
firmware_features_table[FIRMWARE_MAX_FEATURES] = {
	{FW_FEATURE_PFT,		"hcall-pft"},
	{FW_FEATURE_TCE,		"hcall-tce"},
	{FW_FEATURE_SPRG0,		"hcall-sprg0"},
	{FW_FEATURE_DABR,		"hcall-dabr"},
	{FW_FEATURE_COPY,		"hcall-copy"},
	{FW_FEATURE_ASR,		"hcall-asr"},
	{FW_FEATURE_DEBUG,		"hcall-debug"},
	{FW_FEATURE_PERF,		"hcall-perf"},
	{FW_FEATURE_DUMP,		"hcall-dump"},
	{FW_FEATURE_INTERRUPT,		"hcall-interrupt"},
	{FW_FEATURE_MIGRATE,		"hcall-migrate"},
	{FW_FEATURE_PERFMON,		"hcall-perfmon"},
	{FW_FEATURE_CRQ,		"hcall-crq"},
	{FW_FEATURE_VIO,		"hcall-vio"},
	{FW_FEATURE_RDMA,		"hcall-rdma"},
	{FW_FEATURE_LLAN,		"hcall-lLAN"},
	{FW_FEATURE_BULK,		"hcall-bulk"},
	{FW_FEATURE_XDABR,		"hcall-xdabr"},
	{FW_FEATURE_MULTITCE,		"hcall-multi-tce"},
	{FW_FEATURE_SPLPAR,		"hcall-splpar"},
	{FW_FEATURE_BULK_REMOVE,	"hcall-bulk"},
};

/* Build up the firmware features bitmask using the contents of
 * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
 * be moved into prom.c prom_init().
 */
void __init fw_feature_init(const char *hypertas, unsigned long len)
{
	const char *s;
	int i;

	DBG(" -> fw_feature_init()\n");

	for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
		for (i = 0; i < FIRMWARE_MAX_FEATURES; i++) {
			/* check value against table of strings */
			if (!firmware_features_table[i].name ||
			    strcmp(firmware_features_table[i].name, s))
				continue;

			/* we have a match */
			powerpc_firmware_features |=
				firmware_features_table[i].val;
			break;
		}
	}

	DBG(" <- fw_feature_init()\n");
}