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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.

/*
 * 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.
 *
 * Copyright (C) IBM Corporation, 2004
 *
 * Author: Max Asböck <amax@us.ibm.com>
 *
 */

#include "ibmasm.h"
#include "dot_command.h"

/*
 * Reverse Heartbeat, i.e. heartbeats sent from the driver to the
 * service processor.
 * These heartbeats are initiated by user level programs.
 */

/* the reverse heartbeat dot command */
#pragma pack(1)
static struct {
	struct dot_command_header	header;
	unsigned char			command[3];
} rhb_dot_cmd = {
	.header = {
		.type =		sp_read,
		.command_size = 3,
		.data_size =	0,
		.status =	0
	},
	.command = { 4, 3, 6 }
};
#pragma pack()

void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb)
{
	init_waitqueue_head(&rhb->wait);
	rhb->stopped = 0;
}

/**
 * start_reverse_heartbeat
 * Loop forever, sending a reverse heartbeat dot command to the service
 * processor, then sleeping. The loop comes to an end if the service
 * processor fails to respond 3 times or we were interrupted.
 */
int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb)
{
	struct command *cmd;
	int times_failed = 0;
	int result = 1;

	cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd);
	if (!cmd)
		return -ENOMEM;

	while (times_failed < 3) {
		memcpy(cmd->buffer, (void *)&rhb_dot_cmd, sizeof rhb_dot_cmd);
		cmd->status = IBMASM_CMD_PENDING;
		ibmasm_exec_command(sp, cmd);
		ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);

		if (cmd->status != IBMASM_CMD_COMPLETE)
			times_failed++;

		wait_event_interruptible_timeout(rhb->wait,
			rhb->stopped,
			REVERSE_HEARTBEAT_TIMEOUT * HZ);

		if (signal_pending(current) || rhb->stopped) {
			result = -EINTR;
			break;
		}
	}
	command_put(cmd);
	rhb->stopped = 0;

	return result;
}

void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb)
{
	rhb->stopped = 1;
	wake_up_interruptible(&rhb->wait);
}