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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.

/*
 * net/tipc/handler.c: TIPC signal handling
 *
 * Copyright (c) 2000-2006, Ericsson AB
 * Copyright (c) 2005, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"

struct queue_item {
	struct list_head next_signal;
	void (*handler) (unsigned long);
	unsigned long data;
};

static struct kmem_cache *tipc_queue_item_cache;
static struct list_head signal_queue_head;
static DEFINE_SPINLOCK(qitem_lock);
static int handler_enabled = 0;

static void process_signal_queue(unsigned long dummy);

static DECLARE_TASKLET_DISABLED(tipc_tasklet, process_signal_queue, 0);


unsigned int tipc_k_signal(Handler routine, unsigned long argument)
{
	struct queue_item *item;

	if (!handler_enabled) {
		err("Signal request ignored by handler\n");
		return -ENOPROTOOPT;
	}

	spin_lock_bh(&qitem_lock);
	item = kmem_cache_alloc(tipc_queue_item_cache, GFP_ATOMIC);
	if (!item) {
		err("Signal queue out of memory\n");
		spin_unlock_bh(&qitem_lock);
		return -ENOMEM;
	}
	item->handler = routine;
	item->data = argument;
	list_add_tail(&item->next_signal, &signal_queue_head);
	spin_unlock_bh(&qitem_lock);
	tasklet_schedule(&tipc_tasklet);
	return 0;
}

static void process_signal_queue(unsigned long dummy)
{
	struct queue_item *__volatile__ item;
	struct list_head *l, *n;

	spin_lock_bh(&qitem_lock);
	list_for_each_safe(l, n, &signal_queue_head) {
		item = list_entry(l, struct queue_item, next_signal);
		list_del(&item->next_signal);
		spin_unlock_bh(&qitem_lock);
		item->handler(item->data);
		spin_lock_bh(&qitem_lock);
		kmem_cache_free(tipc_queue_item_cache, item);
	}
	spin_unlock_bh(&qitem_lock);
}

int tipc_handler_start(void)
{
	tipc_queue_item_cache =
		kmem_cache_create("tipc_queue_items", sizeof(struct queue_item),
				  0, SLAB_HWCACHE_ALIGN, NULL);
	if (!tipc_queue_item_cache)
		return -ENOMEM;

	INIT_LIST_HEAD(&signal_queue_head);
	tasklet_enable(&tipc_tasklet);
	handler_enabled = 1;
	return 0;
}

void tipc_handler_stop(void)
{
	struct list_head *l, *n;
	struct queue_item *item;

	if (!handler_enabled)
		return;

	handler_enabled = 0;
	tasklet_disable(&tipc_tasklet);
	tasklet_kill(&tipc_tasklet);

	spin_lock_bh(&qitem_lock);
	list_for_each_safe(l, n, &signal_queue_head) {
		item = list_entry(l, struct queue_item, next_signal);
		list_del(&item->next_signal);
		kmem_cache_free(tipc_queue_item_cache, item);
	}
	spin_unlock_bh(&qitem_lock);

	kmem_cache_destroy(tipc_queue_item_cache);
}