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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.

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_THREAD_INFO_H
#define __ASM_AVR32_THREAD_INFO_H

#include <asm/page.h>

#define THREAD_SIZE_ORDER	1
#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)

#ifndef __ASSEMBLY__
#include <asm/types.h>

struct task_struct;
struct exec_domain;

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	__u32			cpu;
	__s32			preempt_count;	/* 0 => preemptable, <0 => BUG */
	struct restart_block	restart_block;
	__u8			supervisor_stack[0];
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.exec_domain	= &default_exec_domain,				\
	.flags		= 0,						\
	.cpu		= 0,						\
	.preempt_count	= 1,						\
	.restart_block	= {						\
		.fn	= do_no_restart_syscall				\
	}								\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/*
 * Get the thread information struct from C.
 * We do the usual trick and use the lower end of the stack for this
 */
static inline struct thread_info *current_thread_info(void)
{
	unsigned long addr = ~(THREAD_SIZE - 1);

	asm("and %0, sp" : "=r"(addr) : "0"(addr));
	return (struct thread_info *)addr;
}

/* thread information allocation */
#define alloc_thread_info(ti) \
	((struct thread_info *) __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER))
#define free_thread_info(ti) free_pages((unsigned long)(ti), 1)
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)

#endif /* !__ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x40000000

/*
 * Thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
#define TIF_SIGPENDING          1       /* signal pending */
#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
#define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
					   TIF_NEED_RESCHED */
#define TIF_BREAKPOINT		4	/* true if we should break after return */
#define TIF_SINGLE_STEP		5	/* single step after next break */
#define TIF_MEMDIE		6
#define TIF_RESTORE_SIGMASK	7	/* restore signal mask in do_signal */
#define TIF_CPU_GOING_TO_SLEEP	8	/* CPU is entering sleep 0 mode */
#define TIF_USERSPACE		31      /* true if FS sets userspace */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_BREAKPOINT		(1 << TIF_BREAKPOINT)
#define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
#define _TIF_MEMDIE		(1 << TIF_MEMDIE)
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)

/* XXX: These two masks must never span more than 16 bits! */
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK		0x0000013e
/* work to do on any return to userspace */
#define _TIF_ALLWORK_MASK	0x0000013f
/* work to do on return from debug mode */
#define _TIF_DBGWORK_MASK	0x0000017e

#endif /* __ASM_AVR32_THREAD_INFO_H */