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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 2002 Andi Kleen */

#include <linux/linkage.h>
#include <asm/dwarf2.h>
#include <asm/cpufeature.h>

/*
 * memcpy - Copy a memory block.
 *
 * Input:	
 * rdi destination
 * rsi source
 * rdx count
 * 
 * Output:
 * rax original destination
 */	

	ALIGN
memcpy_c:
	CFI_STARTPROC
	movq %rdi,%rax
	movl %edx,%ecx
	shrl $3,%ecx
	andl $7,%edx
	rep movsq
	movl %edx,%ecx
	rep movsb
	ret
	CFI_ENDPROC
ENDPROC(memcpy_c)

ENTRY(__memcpy)
ENTRY(memcpy)
	CFI_STARTPROC
	pushq %rbx
	CFI_ADJUST_CFA_OFFSET 8
	CFI_REL_OFFSET rbx, 0
	movq %rdi,%rax

	movl %edx,%ecx
	shrl $6,%ecx
	jz .Lhandle_tail

	.p2align 4
.Lloop_64:
	decl %ecx

	movq (%rsi),%r11
	movq 8(%rsi),%r8

	movq %r11,(%rdi)
	movq %r8,1*8(%rdi)

	movq 2*8(%rsi),%r9
	movq 3*8(%rsi),%r10

	movq %r9,2*8(%rdi)
	movq %r10,3*8(%rdi)

	movq 4*8(%rsi),%r11
	movq 5*8(%rsi),%r8

	movq %r11,4*8(%rdi)
	movq %r8,5*8(%rdi)

	movq 6*8(%rsi),%r9
	movq 7*8(%rsi),%r10

	movq %r9,6*8(%rdi)
	movq %r10,7*8(%rdi)

	leaq 64(%rsi),%rsi
	leaq 64(%rdi),%rdi
	jnz  .Lloop_64

.Lhandle_tail:
	movl %edx,%ecx
	andl $63,%ecx
	shrl $3,%ecx
	jz   .Lhandle_7
	.p2align 4
.Lloop_8:
	decl %ecx
	movq (%rsi),%r8
	movq %r8,(%rdi)
	leaq 8(%rdi),%rdi
	leaq 8(%rsi),%rsi
	jnz  .Lloop_8

.Lhandle_7:
	movl %edx,%ecx
	andl $7,%ecx
	jz .Lende
	.p2align 4
.Lloop_1:
	movb (%rsi),%r8b
	movb %r8b,(%rdi)
	incq %rdi
	incq %rsi
	decl %ecx
	jnz .Lloop_1

.Lende:
	popq %rbx
	CFI_ADJUST_CFA_OFFSET -8
	CFI_RESTORE rbx
	ret
.Lfinal:
	CFI_ENDPROC
ENDPROC(memcpy)
ENDPROC(__memcpy)

	/* Some CPUs run faster using the string copy instructions.
	   It is also a lot simpler. Use this when possible */

	.section .altinstr_replacement,"ax"
1:	.byte 0xeb				/* jmp <disp8> */
	.byte (memcpy_c - memcpy) - (2f - 1b)	/* offset */
2:
	.previous
	.section .altinstructions,"a"
	.align 8
	.quad memcpy
	.quad 1b
	.byte X86_FEATURE_REP_GOOD
	/* Replace only beginning, memcpy is used to apply alternatives, so it
	 * is silly to overwrite itself with nops - reboot is only outcome... */
	.byte 2b - 1b
	.byte 2b - 1b
	.previous