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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 PowerPC Virtual I/O Infrastructure Support.
 *
 * Copyright (c) 2003 IBM Corp.
 *  Dave Engebretsen engebret@us.ibm.com
 *  Santiago Leon santil@us.ibm.com
 *
 * 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.
 */

#ifndef _ASM_POWERPC_VIO_H
#define _ASM_POWERPC_VIO_H
#ifdef __KERNEL__

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mod_devicetable.h>

#include <asm/hvcall.h>
#include <asm/scatterlist.h>

/*
 * Architecture-specific constants for drivers to
 * extract attributes of the device using vio_get_attribute()
 */
#define VETH_MAC_ADDR "local-mac-address"
#define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"

/* End architecture-specific constants */

#define h_vio_signal(ua, mode) \
  plpar_hcall_norets(H_VIO_SIGNAL, ua, mode)

#define VIO_IRQ_DISABLE		0UL
#define VIO_IRQ_ENABLE		1UL

struct iommu_table;

/*
 * The vio_dev structure is used to describe virtual I/O devices.
 */
struct vio_dev {
	const char *name;
	const char *type;
	uint32_t unit_address;
	unsigned int irq;
	struct device dev;
};

struct vio_driver {
	struct list_head node;
	const struct vio_device_id *id_table;
	int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
	int (*remove)(struct vio_dev *dev);
	void (*shutdown)(struct vio_dev *dev);
	unsigned long driver_data;
	struct device_driver driver;
};

extern struct dma_mapping_ops vio_dma_ops;
extern struct bus_type vio_bus_type;

extern int vio_register_driver(struct vio_driver *drv);
extern void vio_unregister_driver(struct vio_driver *drv);

extern void __devinit vio_unregister_device(struct vio_dev *dev);

struct device_node;

extern struct vio_dev * __devinit vio_register_device_node(
		struct device_node *node_vdev);
extern const void *vio_get_attribute(struct vio_dev *vdev, char *which,
		int *length);
#ifdef CONFIG_PPC_PSERIES
extern struct vio_dev *vio_find_node(struct device_node *vnode);
extern int vio_enable_interrupts(struct vio_dev *dev);
extern int vio_disable_interrupts(struct vio_dev *dev);
#else
static inline int vio_enable_interrupts(struct vio_dev *dev)
{
	return 0;
}
#endif

static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
{
	return container_of(drv, struct vio_driver, driver);
}

static inline struct vio_dev *to_vio_dev(struct device *dev)
{
	return container_of(dev, struct vio_dev, dev);
}

#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_VIO_H */