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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.

#ifndef _ASM_IA64_PERCPU_H
#define _ASM_IA64_PERCPU_H

/*
 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */

#define PERCPU_ENOUGH_ROOM PERCPU_PAGE_SIZE

#ifdef __ASSEMBLY__
# define THIS_CPU(var)	(per_cpu__##var)  /* use this to mark accesses to per-CPU variables... */
#else /* !__ASSEMBLY__ */


#include <linux/threads.h>

#ifdef HAVE_MODEL_SMALL_ATTRIBUTE
# define __SMALL_ADDR_AREA	__attribute__((__model__ (__small__)))
#else
# define __SMALL_ADDR_AREA
#endif

#define DECLARE_PER_CPU(type, name)				\
	extern __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name

/* Separate out the type, so (int[3], foo) works. */
#define DEFINE_PER_CPU(type, name)				\
	__attribute__((__section__(".data.percpu")))		\
	__SMALL_ADDR_AREA __typeof__(type) per_cpu__##name

#ifdef CONFIG_SMP
#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)			\
	__attribute__((__section__(".data.percpu.shared_aligned")))	\
	__SMALL_ADDR_AREA __typeof__(type) per_cpu__##name		\
	____cacheline_aligned_in_smp
#else
#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)	\
	DEFINE_PER_CPU(type, name)
#endif

/*
 * Pretty much a literal copy of asm-generic/percpu.h, except that percpu_modcopy() is an
 * external routine, to avoid include-hell.
 */
#ifdef CONFIG_SMP

extern unsigned long __per_cpu_offset[NR_CPUS];
#define per_cpu_offset(x) (__per_cpu_offset(x))

/* Equal to __per_cpu_offset[smp_processor_id()], but faster to access: */
DECLARE_PER_CPU(unsigned long, local_per_cpu_offset);

#define per_cpu(var, cpu)  (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
#define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset)))
#define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __ia64_per_cpu_var(local_per_cpu_offset)))

extern void percpu_modcopy(void *pcpudst, const void *src, unsigned long size);
extern void setup_per_cpu_areas (void);
extern void *per_cpu_init(void);

#else /* ! SMP */

#define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu__##var))
#define __get_cpu_var(var)			per_cpu__##var
#define __raw_get_cpu_var(var)			per_cpu__##var
#define per_cpu_init()				(__phys_per_cpu_start)

#endif	/* SMP */

#define EXPORT_PER_CPU_SYMBOL(var)		EXPORT_SYMBOL(per_cpu__##var)
#define EXPORT_PER_CPU_SYMBOL_GPL(var)		EXPORT_SYMBOL_GPL(per_cpu__##var)

/*
 * Be extremely careful when taking the address of this variable!  Due to virtual
 * remapping, it is different from the canonical address returned by __get_cpu_var(var)!
 * On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly
 * more efficient.
 */
#define __ia64_per_cpu_var(var)	(per_cpu__##var)

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_IA64_PERCPU_H */