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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.

/******************************************************************************
 * memory.h
 *
 * Memory reservation and information.
 *
 * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
 */

#ifndef __XEN_PUBLIC_MEMORY_H__
#define __XEN_PUBLIC_MEMORY_H__

/*
 * Increase or decrease the specified domain's memory reservation. Returns a
 * -ve errcode on failure, or the # extents successfully allocated or freed.
 * arg == addr of struct xen_memory_reservation.
 */
#define XENMEM_increase_reservation 0
#define XENMEM_decrease_reservation 1
#define XENMEM_populate_physmap     6
struct xen_memory_reservation {

    /*
     * XENMEM_increase_reservation:
     *   OUT: MFN (*not* GMFN) bases of extents that were allocated
     * XENMEM_decrease_reservation:
     *   IN:  GMFN bases of extents to free
     * XENMEM_populate_physmap:
     *   IN:  GPFN bases of extents to populate with memory
     *   OUT: GMFN bases of extents that were allocated
     *   (NB. This command also updates the mach_to_phys translation table)
     */
    GUEST_HANDLE(ulong) extent_start;

    /* Number of extents, and size/alignment of each (2^extent_order pages). */
    unsigned long  nr_extents;
    unsigned int   extent_order;

    /*
     * Maximum # bits addressable by the user of the allocated region (e.g.,
     * I/O devices often have a 32-bit limitation even in 64-bit systems). If
     * zero then the user has no addressing restriction.
     * This field is not used by XENMEM_decrease_reservation.
     */
    unsigned int   address_bits;

    /*
     * Domain whose reservation is being changed.
     * Unprivileged domains can specify only DOMID_SELF.
     */
    domid_t        domid;

};
DEFINE_GUEST_HANDLE_STRUCT(xen_memory_reservation);

/*
 * Returns the maximum machine frame number of mapped RAM in this system.
 * This command always succeeds (it never returns an error code).
 * arg == NULL.
 */
#define XENMEM_maximum_ram_page     2

/*
 * Returns the current or maximum memory reservation, in pages, of the
 * specified domain (may be DOMID_SELF). Returns -ve errcode on failure.
 * arg == addr of domid_t.
 */
#define XENMEM_current_reservation  3
#define XENMEM_maximum_reservation  4

/*
 * Returns a list of MFN bases of 2MB extents comprising the machine_to_phys
 * mapping table. Architectures which do not have a m2p table do not implement
 * this command.
 * arg == addr of xen_machphys_mfn_list_t.
 */
#define XENMEM_machphys_mfn_list    5
struct xen_machphys_mfn_list {
    /*
     * Size of the 'extent_start' array. Fewer entries will be filled if the
     * machphys table is smaller than max_extents * 2MB.
     */
    unsigned int max_extents;

    /*
     * Pointer to buffer to fill with list of extent starts. If there are
     * any large discontiguities in the machine address space, 2MB gaps in
     * the machphys table will be represented by an MFN base of zero.
     */
    GUEST_HANDLE(ulong) extent_start;

    /*
     * Number of extents written to the above array. This will be smaller
     * than 'max_extents' if the machphys table is smaller than max_e * 2MB.
     */
    unsigned int nr_extents;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mfn_list);

/*
 * Sets the GPFN at which a particular page appears in the specified guest's
 * pseudophysical address space.
 * arg == addr of xen_add_to_physmap_t.
 */
#define XENMEM_add_to_physmap      7
struct xen_add_to_physmap {
    /* Which domain to change the mapping for. */
    domid_t domid;

    /* Source mapping space. */
#define XENMAPSPACE_shared_info 0 /* shared info page */
#define XENMAPSPACE_grant_table 1 /* grant table page */
    unsigned int space;

    /* Index into source mapping space. */
    unsigned long idx;

    /* GPFN where the source mapping page should appear. */
    unsigned long gpfn;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);

/*
 * Translates a list of domain-specific GPFNs into MFNs. Returns a -ve error
 * code on failure. This call only works for auto-translated guests.
 */
#define XENMEM_translate_gpfn_list  8
struct xen_translate_gpfn_list {
    /* Which domain to translate for? */
    domid_t domid;

    /* Length of list. */
    unsigned long nr_gpfns;

    /* List of GPFNs to translate. */
    GUEST_HANDLE(ulong) gpfn_list;

    /*
     * Output list to contain MFN translations. May be the same as the input
     * list (in which case each input GPFN is overwritten with the output MFN).
     */
    GUEST_HANDLE(ulong) mfn_list;
};
DEFINE_GUEST_HANDLE_STRUCT(xen_translate_gpfn_list);

#endif /* __XEN_PUBLIC_MEMORY_H__ */