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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_GENERIC_UNALIGNED_H_
#define _ASM_GENERIC_UNALIGNED_H_

/*
 * For the benefit of those who are trying to port Linux to another
 * architecture, here are some C-language equivalents. 
 *
 * This is based almost entirely upon Richard Henderson's
 * asm-alpha/unaligned.h implementation.  Some comments were
 * taken from David Mosberger's asm-ia64/unaligned.h header.
 */

#include <linux/types.h>

/* 
 * The main single-value unaligned transfer routines.
 */
#define get_unaligned(ptr) \
	__get_unaligned((ptr), sizeof(*(ptr)))
#define put_unaligned(x,ptr) \
	((void)sizeof(*(ptr)=(x)),\
	__put_unaligned((__force __u64)(x), (ptr), sizeof(*(ptr))))

/*
 * This function doesn't actually exist.  The idea is that when
 * someone uses the macros below with an unsupported size (datatype),
 * the linker will alert us to the problem via an unresolved reference
 * error.
 */
extern void bad_unaligned_access_length(void) __attribute__((noreturn));

struct __una_u64 { __u64 x __attribute__((packed)); };
struct __una_u32 { __u32 x __attribute__((packed)); };
struct __una_u16 { __u16 x __attribute__((packed)); };

/*
 * Elemental unaligned loads 
 */

static inline __u64 __uldq(const __u64 *addr)
{
	const struct __una_u64 *ptr = (const struct __una_u64 *) addr;
	return ptr->x;
}

static inline __u32 __uldl(const __u32 *addr)
{
	const struct __una_u32 *ptr = (const struct __una_u32 *) addr;
	return ptr->x;
}

static inline __u16 __uldw(const __u16 *addr)
{
	const struct __una_u16 *ptr = (const struct __una_u16 *) addr;
	return ptr->x;
}

/*
 * Elemental unaligned stores 
 */

static inline void __ustq(__u64 val, __u64 *addr)
{
	struct __una_u64 *ptr = (struct __una_u64 *) addr;
	ptr->x = val;
}

static inline void __ustl(__u32 val, __u32 *addr)
{
	struct __una_u32 *ptr = (struct __una_u32 *) addr;
	ptr->x = val;
}

static inline void __ustw(__u16 val, __u16 *addr)
{
	struct __una_u16 *ptr = (struct __una_u16 *) addr;
	ptr->x = val;
}

#define __get_unaligned(ptr, size) ({		\
	const void *__gu_p = ptr;		\
	__u64 __val;				\
	switch (size) {				\
	case 1:					\
		__val = *(const __u8 *)__gu_p;	\
		break;				\
	case 2:					\
		__val = __uldw(__gu_p);		\
		break;				\
	case 4:					\
		__val = __uldl(__gu_p);		\
		break;				\
	case 8:					\
		__val = __uldq(__gu_p);		\
		break;				\
	default:				\
		bad_unaligned_access_length();	\
	};					\
	(__force __typeof__(*(ptr)))__val;	\
})

#define __put_unaligned(val, ptr, size)		\
({						\
	void *__gu_p = ptr;			\
	switch (size) {				\
	case 1:					\
		*(__u8 *)__gu_p = (__force __u8)val;		\
	        break;				\
	case 2:					\
		__ustw((__force __u16)val, __gu_p);		\
		break;				\
	case 4:					\
		__ustl((__force __u32)val, __gu_p);		\
		break;				\
	case 8:					\
		__ustq(val, __gu_p);		\
		break;				\
	default:				\
	    	bad_unaligned_access_length();	\
	};					\
	(void)0;				\
})

#endif /* _ASM_GENERIC_UNALIGNED_H */