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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) 2000, 2004  Maciej W. Rozycki
 * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#ifndef _ASM_DIV64_H
#define _ASM_DIV64_H

#include <linux/types.h>

#if (_MIPS_SZLONG == 32)

#include <asm/compiler.h>

/*
 * No traps on overflows for any of these...
 */

#define do_div64_32(res, high, low, base) ({ \
	unsigned long __quot32, __mod32; \
	unsigned long __cf, __tmp, __tmp2, __i; \
	\
	__asm__(".set	push\n\t" \
		".set	noat\n\t" \
		".set	noreorder\n\t" \
		"move	%2, $0\n\t" \
		"move	%3, $0\n\t" \
		"b	1f\n\t" \
		" li	%4, 0x21\n" \
		"0:\n\t" \
		"sll	$1, %0, 0x1\n\t" \
		"srl	%3, %0, 0x1f\n\t" \
		"or	%0, $1, %5\n\t" \
		"sll	%1, %1, 0x1\n\t" \
		"sll	%2, %2, 0x1\n" \
		"1:\n\t" \
		"bnez	%3, 2f\n\t" \
		" sltu	%5, %0, %z6\n\t" \
		"bnez	%5, 3f\n" \
		"2:\n\t" \
		" addiu	%4, %4, -1\n\t" \
		"subu	%0, %0, %z6\n\t" \
		"addiu	%2, %2, 1\n" \
		"3:\n\t" \
		"bnez	%4, 0b\n\t" \
		" srl	%5, %1, 0x1f\n\t" \
		".set	pop" \
		: "=&r" (__mod32), "=&r" (__tmp), \
		  "=&r" (__quot32), "=&r" (__cf), \
		  "=&r" (__i), "=&r" (__tmp2) \
		: "Jr" (base), "0" (high), "1" (low)); \
	\
	(res) = __quot32; \
	__mod32; })

#define do_div(n, base) ({ \
	unsigned long long __quot; \
	unsigned long __mod; \
	unsigned long long __div; \
	unsigned long __upper, __low, __high, __base; \
	\
	__div = (n); \
	__base = (base); \
	\
	__high = __div >> 32; \
	__low = __div; \
	__upper = __high; \
	\
	if (__high) \
		__asm__("divu	$0, %z2, %z3" \
			: "=h" (__upper), "=l" (__high) \
			: "Jr" (__high), "Jr" (__base) \
			: GCC_REG_ACCUM); \
	\
	__mod = do_div64_32(__low, __upper, __low, __base); \
	\
	__quot = __high; \
	__quot = __quot << 32 | __low; \
	(n) = __quot; \
	__mod; })

extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
#endif /* (_MIPS_SZLONG == 32) */

#if (_MIPS_SZLONG == 64)

/*
 * Hey, we're already 64-bit, no
 * need to play games..
 */
#define do_div(n, base) ({ \
	unsigned long __quot; \
	unsigned int __mod; \
	unsigned long __div; \
	unsigned int __base; \
	\
	__div = (n); \
	__base = (base); \
	\
	__mod = __div % __base; \
	__quot = __div / __base; \
	\
	(n) = __quot; \
	__mod; })

static inline uint64_t div64_64(uint64_t dividend, uint64_t divisor)
{
	return dividend / divisor;
}

#endif /* (_MIPS_SZLONG == 64) */

#endif /* _ASM_DIV64_H */