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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.

/*
 * arch/alpha/kernel/head.S
 *
 * initial boot stuff.. At this point, the bootloader has already
 * switched into OSF/1 PAL-code, and loaded us at the correct address
 * (START_ADDR).  So there isn't much left for us to do: just set up
 * the kernel global pointer and jump to the kernel entry-point.
 */

#include <asm/system.h>
#include <asm/asm-offsets.h>

.section .text.head, "ax"
.globl swapper_pg_dir
.globl _stext
swapper_pg_dir=SWAPPER_PGD

	.set noreorder
	.globl	__start
	.ent	__start
_stext:
__start:
	.prologue 0
	br	$27,1f
1:	ldgp	$29,0($27)
	/* We need to get current_task_info loaded up...  */
	lda	$8,init_thread_union
	/* ... and find our stack ... */
	lda	$30,0x4000 - SIZEOF_PT_REGS($8)
	/* ... and then we can start the kernel.  */
	jsr	$26,start_kernel
	call_pal PAL_halt
	.end __start

#ifdef CONFIG_SMP
	.align 3
	.globl	__smp_callin
	.ent	__smp_callin
	/* On entry here from SRM console, the HWPCB of the per-cpu
	   slot for this processor has been loaded.  We've arranged
	   for the UNIQUE value for this process to contain the PCBB
	   of the target idle task.  */
__smp_callin:
	.prologue 1
	ldgp	$29,0($27)	# First order of business, load the GP.

	call_pal PAL_rduniq	# Grab the target PCBB.
	mov	$0,$16		# Install it.
	call_pal PAL_swpctx

	lda	$8,0x3fff	# Find "current".
	bic	$30,$8,$8
	
	jsr	$26,smp_callin
	call_pal PAL_halt
	.end __smp_callin
#endif /* CONFIG_SMP */

	#
	# The following two functions are needed for supporting SRM PALcode
	# on the PC164 (at least), since that PALcode manages the interrupt
	# masking, and we cannot duplicate the effort without causing problems
	#

	.align 3
	.globl	cserve_ena
	.ent	cserve_ena
cserve_ena:
	.prologue 0
	bis	$16,$16,$17
	lda	$16,52($31)
	call_pal PAL_cserve
	ret	($26)
	.end	cserve_ena

	.align 3
	.globl	cserve_dis
	.ent	cserve_dis
cserve_dis:
	.prologue 0
	bis	$16,$16,$17
	lda	$16,53($31)
	call_pal PAL_cserve
	ret	($26)
	.end	cserve_dis

	#
	# It is handy, on occasion, to make halt actually just loop. 
	# Putting it here means we dont have to recompile the whole
	# kernel.
	#

	.align 3
	.globl	halt
	.ent	halt
halt:
	.prologue 0
	call_pal PAL_halt
	.end	halt