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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:

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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
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Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

/*
 * IBM ASM Service Processor Device Driver
 *
 * 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"

/**
 * Dispatch an incoming message to the specific handler for the message.
 * Called from interrupt context.
 */
void ibmasm_receive_message(struct service_processor *sp, void *message, int message_size)
{
	u32 size;
	struct dot_command_header *header = (struct dot_command_header *)message;

	if (message_size == 0)
		return;

	size = get_dot_command_size(message);
	if (size == 0)
		return;

	if (size > message_size)
		size = message_size;

	switch (header->type) {
	case sp_event:
		ibmasm_receive_event(sp, message, size);
		break;
	case sp_command_response:
		ibmasm_receive_command_response(sp, message, size);
		break;
	case sp_heartbeat:
		ibmasm_receive_heartbeat(sp, message, size);
		break;
	default:
		dev_err(sp->dev, "Received unknown message from service processor\n");
	}
}


#define INIT_BUFFER_SIZE 32


/**
 * send the 4.3.5.10 dot command (driver VPD) to the service processor
 */
int ibmasm_send_driver_vpd(struct service_processor *sp)
{
	struct command *command;
	struct dot_command_header *header;
	u8 *vpd_command;
	u8 *vpd_data;
	int result = 0;

	command = ibmasm_new_command(sp, INIT_BUFFER_SIZE);
	if (command == NULL)
		return -ENOMEM;

	header = (struct dot_command_header *)command->buffer;
	header->type                = sp_write;
	header->command_size        = 4;
	header->data_size           = 16;
	header->status              = 0;
	header->reserved            = 0;

	vpd_command = command->buffer + sizeof(struct dot_command_header);
	vpd_command[0] = 0x4;
	vpd_command[1] = 0x3;
	vpd_command[2] = 0x5;
	vpd_command[3] = 0xa;

	vpd_data = vpd_command + header->command_size;
	vpd_data[0] = 0;
	strcat(vpd_data, IBMASM_DRIVER_VPD);
	vpd_data[10] = 0;
	vpd_data[15] = 0;

	ibmasm_exec_command(sp, command);
	ibmasm_wait_for_response(command, IBMASM_CMD_TIMEOUT_NORMAL);

	if (command->status != IBMASM_CMD_COMPLETE)
		result = -ENODEV;

	command_put(command);

	return result;
}

struct os_state_command {
	struct dot_command_header	header;
	unsigned char			command[3];
	unsigned char			data;
};

/**
 * send the 4.3.6 dot command (os state) to the service processor
 * During driver init this function is called with os state "up".
 * This causes the service processor to start sending heartbeats the
 * driver.
 * During driver exit the function is called with os state "down",
 * causing the service processor to stop the heartbeats.
 */
int ibmasm_send_os_state(struct service_processor *sp, int os_state)
{
	struct command *cmd;
	struct os_state_command *os_state_cmd;
	int result = 0;

	cmd = ibmasm_new_command(sp, sizeof(struct os_state_command));
	if (cmd == NULL)
		return -ENOMEM;

	os_state_cmd = (struct os_state_command *)cmd->buffer;
	os_state_cmd->header.type		= sp_write;
	os_state_cmd->header.command_size	= 3;
	os_state_cmd->header.data_size		= 1;
	os_state_cmd->header.status		= 0;
	os_state_cmd->command[0]		= 4;
	os_state_cmd->command[1]		= 3;
	os_state_cmd->command[2]		= 6;
	os_state_cmd->data			= os_state;

	ibmasm_exec_command(sp, cmd);
	ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);

	if (cmd->status != IBMASM_CMD_COMPLETE)
		result = -ENODEV;

	command_put(cmd);
	return result;
}