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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.

/******************************************************************************
 * elfnote.h
 *
 * Definitions used for the Xen ELF notes.
 *
 * Copyright (c) 2006, Ian Campbell, XenSource Ltd.
 */

#ifndef __XEN_PUBLIC_ELFNOTE_H__
#define __XEN_PUBLIC_ELFNOTE_H__

/*
 * The notes should live in a SHT_NOTE segment and have "Xen" in the
 * name field.
 *
 * Numeric types are either 4 or 8 bytes depending on the content of
 * the desc field.
 *
 * LEGACY indicated the fields in the legacy __xen_guest string which
 * this a note type replaces.
 */

/*
 * NAME=VALUE pair (string).
 *
 * LEGACY: FEATURES and PAE
 */
#define XEN_ELFNOTE_INFO           0

/*
 * The virtual address of the entry point (numeric).
 *
 * LEGACY: VIRT_ENTRY
 */
#define XEN_ELFNOTE_ENTRY          1

/* The virtual address of the hypercall transfer page (numeric).
 *
 * LEGACY: HYPERCALL_PAGE. (n.b. legacy value is a physical page
 * number not a virtual address)
 */
#define XEN_ELFNOTE_HYPERCALL_PAGE 2

/* The virtual address where the kernel image should be mapped (numeric).
 *
 * Defaults to 0.
 *
 * LEGACY: VIRT_BASE
 */
#define XEN_ELFNOTE_VIRT_BASE      3

/*
 * The offset of the ELF paddr field from the acutal required
 * psuedo-physical address (numeric).
 *
 * This is used to maintain backwards compatibility with older kernels
 * which wrote __PAGE_OFFSET into that field. This field defaults to 0
 * if not present.
 *
 * LEGACY: ELF_PADDR_OFFSET. (n.b. legacy default is VIRT_BASE)
 */
#define XEN_ELFNOTE_PADDR_OFFSET   4

/*
 * The version of Xen that we work with (string).
 *
 * LEGACY: XEN_VER
 */
#define XEN_ELFNOTE_XEN_VERSION    5

/*
 * The name of the guest operating system (string).
 *
 * LEGACY: GUEST_OS
 */
#define XEN_ELFNOTE_GUEST_OS       6

/*
 * The version of the guest operating system (string).
 *
 * LEGACY: GUEST_VER
 */
#define XEN_ELFNOTE_GUEST_VERSION  7

/*
 * The loader type (string).
 *
 * LEGACY: LOADER
 */
#define XEN_ELFNOTE_LOADER         8

/*
 * The kernel supports PAE (x86/32 only, string = "yes" or "no").
 *
 * LEGACY: PAE (n.b. The legacy interface included a provision to
 * indicate 'extended-cr3' support allowing L3 page tables to be
 * placed above 4G. It is assumed that any kernel new enough to use
 * these ELF notes will include this and therefore "yes" here is
 * equivalent to "yes[entended-cr3]" in the __xen_guest interface.
 */
#define XEN_ELFNOTE_PAE_MODE       9

/*
 * The features supported/required by this kernel (string).
 *
 * The string must consist of a list of feature names (as given in
 * features.h, without the "XENFEAT_" prefix) separated by '|'
 * characters. If a feature is required for the kernel to function
 * then the feature name must be preceded by a '!' character.
 *
 * LEGACY: FEATURES
 */
#define XEN_ELFNOTE_FEATURES      10

/*
 * The kernel requires the symbol table to be loaded (string = "yes" or "no")
 * LEGACY: BSD_SYMTAB (n.b. The legacy treated the presence or absence
 * of this string as a boolean flag rather than requiring "yes" or
 * "no".
 */
#define XEN_ELFNOTE_BSD_SYMTAB    11

#endif /* __XEN_PUBLIC_ELFNOTE_H__ */

/*
 * Local variables:
 * mode: C
 * c-set-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */