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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.

/*
 *  NEC VR4100 series GIU platform device.
 *
 *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
 *
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>

#include <asm/cpu.h>
#include <asm/vr41xx/giu.h>
#include <asm/vr41xx/irq.h>

static struct resource giu_50pins_pullupdown_resource[] __initdata = {
	{
		.start	= 0x0b000100,
		.end	= 0x0b00011f,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= 0x0b0002e0,
		.end	= 0x0b0002e3,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= GIUINT_IRQ,
		.end	= GIUINT_IRQ,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct resource giu_36pins_resource[] __initdata = {
	{
		.start	= 0x0f000140,
		.end	= 0x0f00015f,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= GIUINT_IRQ,
		.end	= GIUINT_IRQ,
		.flags	= IORESOURCE_IRQ,
	},
};

static struct resource giu_48pins_resource[] __initdata = {
	{
		.start	= 0x0f000140,
		.end	= 0x0f000167,
		.flags	= IORESOURCE_MEM,
	},
	{
		.start	= GIUINT_IRQ,
		.end	= GIUINT_IRQ,
		.flags	= IORESOURCE_IRQ,
	},
};

static int __init vr41xx_giu_add(void)
{
	struct platform_device *pdev;
	struct resource *res;
	unsigned int num;
	int retval;

	pdev = platform_device_alloc("GIU", -1);
	if (!pdev)
		return -ENOMEM;

	switch (current_cpu_data.cputype) {
	case CPU_VR4111:
	case CPU_VR4121:
		pdev->id = GPIO_50PINS_PULLUPDOWN;
		res = giu_50pins_pullupdown_resource;
		num = ARRAY_SIZE(giu_50pins_pullupdown_resource);
		break;
	case CPU_VR4122:
	case CPU_VR4131:
		pdev->id = GPIO_36PINS;
		res = giu_36pins_resource;
		num = ARRAY_SIZE(giu_36pins_resource);
		break;
	case CPU_VR4133:
		pdev->id = GPIO_48PINS_EDGE_SELECT;
		res = giu_48pins_resource;
		num = ARRAY_SIZE(giu_48pins_resource);
		break;
	default:
		retval = -ENODEV;
		goto err_free_device;
	}

	retval = platform_device_add_resources(pdev, res, num);
	if (retval)
		goto err_free_device;

	retval = platform_device_add(pdev);
	if (retval)
		goto err_free_device;

	return 0;

err_free_device:
	platform_device_put(pdev);

	return retval;
}
device_initcall(vr41xx_giu_add);