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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:

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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.

/******************************************************************************
 * sched.h
 *
 * Scheduler state interactions
 *
 * Copyright (c) 2005, Keir Fraser <keir@xensource.com>
 */

#ifndef __XEN_PUBLIC_SCHED_H__
#define __XEN_PUBLIC_SCHED_H__

#include "event_channel.h"

/*
 * The prototype for this hypercall is:
 *  long sched_op_new(int cmd, void *arg)
 * @cmd == SCHEDOP_??? (scheduler operation).
 * @arg == Operation-specific extra argument(s), as described below.
 *
 * **NOTE**:
 * Versions of Xen prior to 3.0.2 provide only the following legacy version
 * of this hypercall, supporting only the commands yield, block and shutdown:
 *  long sched_op(int cmd, unsigned long arg)
 * @cmd == SCHEDOP_??? (scheduler operation).
 * @arg == 0               (SCHEDOP_yield and SCHEDOP_block)
 *      == SHUTDOWN_* code (SCHEDOP_shutdown)
 */

/*
 * Voluntarily yield the CPU.
 * @arg == NULL.
 */
#define SCHEDOP_yield       0

/*
 * Block execution of this VCPU until an event is received for processing.
 * If called with event upcalls masked, this operation will atomically
 * reenable event delivery and check for pending events before blocking the
 * VCPU. This avoids a "wakeup waiting" race.
 * @arg == NULL.
 */
#define SCHEDOP_block       1

/*
 * Halt execution of this domain (all VCPUs) and notify the system controller.
 * @arg == pointer to sched_shutdown structure.
 */
#define SCHEDOP_shutdown    2
struct sched_shutdown {
    unsigned int reason; /* SHUTDOWN_* */
};
DEFINE_GUEST_HANDLE_STRUCT(sched_shutdown);

/*
 * Poll a set of event-channel ports. Return when one or more are pending. An
 * optional timeout may be specified.
 * @arg == pointer to sched_poll structure.
 */
#define SCHEDOP_poll        3
struct sched_poll {
    GUEST_HANDLE(evtchn_port_t) ports;
    unsigned int nr_ports;
    uint64_t timeout;
};
DEFINE_GUEST_HANDLE_STRUCT(sched_poll);

/*
 * Reason codes for SCHEDOP_shutdown. These may be interpreted by control
 * software to determine the appropriate action. For the most part, Xen does
 * not care about the shutdown code.
 */
#define SHUTDOWN_poweroff   0  /* Domain exited normally. Clean up and kill. */
#define SHUTDOWN_reboot     1  /* Clean up, kill, and then restart.          */
#define SHUTDOWN_suspend    2  /* Clean up, save suspend info, kill.         */
#define SHUTDOWN_crash      3  /* Tell controller we've crashed.             */

#endif /* __XEN_PUBLIC_SCHED_H__ */