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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.

/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef __XEN_PUBLIC_PHYSDEV_H__
#define __XEN_PUBLIC_PHYSDEV_H__

/*
 * Prototype for this hypercall is:
 *  int physdev_op(int cmd, void *args)
 * @cmd	 == PHYSDEVOP_??? (physdev operation).
 * @args == Operation-specific extra arguments (NULL if none).
 */

/*
 * Notify end-of-interrupt (EOI) for the specified IRQ.
 * @arg == pointer to physdev_eoi structure.
 */
#define PHYSDEVOP_eoi			12
struct physdev_eoi {
	/* IN */
	uint32_t irq;
};

/*
 * Query the status of an IRQ line.
 * @arg == pointer to physdev_irq_status_query structure.
 */
#define PHYSDEVOP_irq_status_query	 5
struct physdev_irq_status_query {
	/* IN */
	uint32_t irq;
	/* OUT */
	uint32_t flags; /* XENIRQSTAT_* */
};

/* Need to call PHYSDEVOP_eoi when the IRQ has been serviced? */
#define _XENIRQSTAT_needs_eoi	(0)
#define	 XENIRQSTAT_needs_eoi	(1U<<_XENIRQSTAT_needs_eoi)

/* IRQ shared by multiple guests? */
#define _XENIRQSTAT_shared	(1)
#define	 XENIRQSTAT_shared	(1U<<_XENIRQSTAT_shared)

/*
 * Set the current VCPU's I/O privilege level.
 * @arg == pointer to physdev_set_iopl structure.
 */
#define PHYSDEVOP_set_iopl		 6
struct physdev_set_iopl {
	/* IN */
	uint32_t iopl;
};

/*
 * Set the current VCPU's I/O-port permissions bitmap.
 * @arg == pointer to physdev_set_iobitmap structure.
 */
#define PHYSDEVOP_set_iobitmap		 7
struct physdev_set_iobitmap {
	/* IN */
	uint8_t * bitmap;
	uint32_t nr_ports;
};

/*
 * Read or write an IO-APIC register.
 * @arg == pointer to physdev_apic structure.
 */
#define PHYSDEVOP_apic_read		 8
#define PHYSDEVOP_apic_write		 9
struct physdev_apic {
	/* IN */
	unsigned long apic_physbase;
	uint32_t reg;
	/* IN or OUT */
	uint32_t value;
};

/*
 * Allocate or free a physical upcall vector for the specified IRQ line.
 * @arg == pointer to physdev_irq structure.
 */
#define PHYSDEVOP_alloc_irq_vector	10
#define PHYSDEVOP_free_irq_vector	11
struct physdev_irq {
	/* IN */
	uint32_t irq;
	/* IN or OUT */
	uint32_t vector;
};

/*
 * Argument to physdev_op_compat() hypercall. Superceded by new physdev_op()
 * hypercall since 0x00030202.
 */
struct physdev_op {
	uint32_t cmd;
	union {
		struct physdev_irq_status_query	     irq_status_query;
		struct physdev_set_iopl		     set_iopl;
		struct physdev_set_iobitmap	     set_iobitmap;
		struct physdev_apic		     apic_op;
		struct physdev_irq		     irq_op;
	} u;
};

/*
 * Notify that some PIRQ-bound event channels have been unmasked.
 * ** This command is obsolete since interface version 0x00030202 and is **
 * ** unsupported by newer versions of Xen.				 **
 */
#define PHYSDEVOP_IRQ_UNMASK_NOTIFY	 4

/*
 * These all-capitals physdev operation names are superceded by the new names
 * (defined above) since interface version 0x00030202.
 */
#define PHYSDEVOP_IRQ_STATUS_QUERY	 PHYSDEVOP_irq_status_query
#define PHYSDEVOP_SET_IOPL		 PHYSDEVOP_set_iopl
#define PHYSDEVOP_SET_IOBITMAP		 PHYSDEVOP_set_iobitmap
#define PHYSDEVOP_APIC_READ		 PHYSDEVOP_apic_read
#define PHYSDEVOP_APIC_WRITE		 PHYSDEVOP_apic_write
#define PHYSDEVOP_ASSIGN_VECTOR		 PHYSDEVOP_alloc_irq_vector
#define PHYSDEVOP_FREE_VECTOR		 PHYSDEVOP_free_irq_vector
#define PHYSDEVOP_IRQ_NEEDS_UNMASK_NOTIFY XENIRQSTAT_needs_eoi
#define PHYSDEVOP_IRQ_SHARED		 XENIRQSTAT_shared

#endif /* __XEN_PUBLIC_PHYSDEV_H__ */