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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.

/*
 * linux/arch/sh/boards/se/7722/irq.c
 *
 * Copyright (C) 2007  Nobuhiro Iwamatsu
 *
 * Hitachi UL SolutionEngine 7722 Support.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/se7722.h>

static void disable_se7722_irq(unsigned int irq)
{
	unsigned int bit = irq - SE7722_FPGA_IRQ_BASE;
	ctrl_outw(ctrl_inw(IRQ01_MASK) | 1 << bit, IRQ01_MASK);
}

static void enable_se7722_irq(unsigned int irq)
{
	unsigned int bit = irq - SE7722_FPGA_IRQ_BASE;
	ctrl_outw(ctrl_inw(IRQ01_MASK) & ~(1 << bit), IRQ01_MASK);
}

static struct irq_chip se7722_irq_chip __read_mostly = {
	.name           = "SE7722-FPGA",
	.mask           = disable_se7722_irq,
	.unmask         = enable_se7722_irq,
	.mask_ack       = disable_se7722_irq,
};

static void se7722_irq_demux(unsigned int irq, struct irq_desc *desc)
{
	unsigned short intv = ctrl_inw(IRQ01_STS);
	struct irq_desc *ext_desc;
	unsigned int ext_irq = SE7722_FPGA_IRQ_BASE;

	intv &= (1 << SE7722_FPGA_IRQ_NR) - 1;

	while (intv) {
		if (intv & 1) {
			ext_desc = irq_desc + ext_irq;
			handle_level_irq(ext_irq, ext_desc);
		}
		intv >>= 1;
		ext_irq++;
	}
}

/*
 * Initialize IRQ setting
 */
void __init init_se7722_IRQ(void)
{
	int i;

	ctrl_outw(0, IRQ01_MASK);       /* disable all irqs */
	ctrl_outw(0x2000, 0xb03fffec);  /* mrshpc irq enable */

	for (i = 0; i < SE7722_FPGA_IRQ_NR; i++)
		set_irq_chip_and_handler_name(SE7722_FPGA_IRQ_BASE + i,
					      &se7722_irq_chip,
					      handle_level_irq, "level");

	set_irq_chained_handler(IRQ0_IRQ, se7722_irq_demux);
	set_irq_type(IRQ0_IRQ, IRQ_TYPE_LEVEL_LOW);

	set_irq_chained_handler(IRQ1_IRQ, se7722_irq_demux);
	set_irq_type(IRQ1_IRQ, IRQ_TYPE_LEVEL_LOW);
}