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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.

/*
 * 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>
 *
 */

/* Condor service processor specific hardware definitions */

#ifndef __IBMASM_CONDOR_H__
#define __IBMASM_CONDOR_H__

#include <asm/io.h>

#define VENDORID_IBM	0x1014
#define DEVICEID_RSA	0x010F

#define GET_MFA_ADDR(x)  (x & 0xFFFFFF00)

#define MAILBOX_FULL(x)  (x & 0x00000001)

#define NO_MFAS_AVAILABLE     0xFFFFFFFF


#define INBOUND_QUEUE_PORT   0x40  /* contains address of next free MFA */
#define OUTBOUND_QUEUE_PORT  0x44  /* contains address of posted MFA    */

#define SP_INTR_MASK	0x00000008
#define UART_INTR_MASK	0x00000010

#define INTR_STATUS_REGISTER   0x13A0
#define INTR_CONTROL_REGISTER  0x13A4

#define SCOUT_COM_A_BASE         0x0000
#define SCOUT_COM_B_BASE         0x0100
#define SCOUT_COM_C_BASE         0x0200
#define SCOUT_COM_D_BASE         0x0300

static inline int sp_interrupt_pending(void __iomem *base_address)
{
	return SP_INTR_MASK & readl(base_address + INTR_STATUS_REGISTER);
}

static inline int uart_interrupt_pending(void __iomem *base_address)
{
	return UART_INTR_MASK & readl(base_address + INTR_STATUS_REGISTER);
}

static inline void ibmasm_enable_interrupts(void __iomem *base_address, int mask)
{
	void __iomem *ctrl_reg = base_address + INTR_CONTROL_REGISTER;
	writel( readl(ctrl_reg) & ~mask, ctrl_reg);
}

static inline void ibmasm_disable_interrupts(void __iomem *base_address, int mask)
{
	void __iomem *ctrl_reg = base_address + INTR_CONTROL_REGISTER;
	writel( readl(ctrl_reg) | mask, ctrl_reg);
}

static inline void enable_sp_interrupts(void __iomem *base_address)
{
	ibmasm_enable_interrupts(base_address, SP_INTR_MASK);
}

static inline void disable_sp_interrupts(void __iomem *base_address)
{
	ibmasm_disable_interrupts(base_address, SP_INTR_MASK);
}

static inline void enable_uart_interrupts(void __iomem *base_address)
{
	ibmasm_enable_interrupts(base_address, UART_INTR_MASK);
}

static inline void disable_uart_interrupts(void __iomem *base_address)
{
	ibmasm_disable_interrupts(base_address, UART_INTR_MASK);
}

#define valid_mfa(mfa)	( (mfa) != NO_MFAS_AVAILABLE )

static inline u32 get_mfa_outbound(void __iomem *base_address)
{
	int retry;
	u32 mfa;

	for (retry=0; retry<=10; retry++) {
		mfa = readl(base_address + OUTBOUND_QUEUE_PORT);
		if (valid_mfa(mfa))
			break;
	}
	return mfa;
}

static inline void set_mfa_outbound(void __iomem *base_address, u32 mfa)
{
	writel(mfa, base_address + OUTBOUND_QUEUE_PORT);
}

static inline u32 get_mfa_inbound(void __iomem *base_address)
{
	u32 mfa = readl(base_address + INBOUND_QUEUE_PORT);

	if (MAILBOX_FULL(mfa))
		return 0;

	return mfa;
}

static inline void set_mfa_inbound(void __iomem *base_address, u32 mfa)
{
	writel(mfa, base_address + INBOUND_QUEUE_PORT);
}

static inline struct i2o_message *get_i2o_message(void __iomem *base_address, u32 mfa)
{
	return (struct i2o_message *)(GET_MFA_ADDR(mfa) + base_address);
}

#endif /* __IBMASM_CONDOR_H__ */