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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/sh/boards/dreamcast/setup.c
 *
 * Hardware support for the Sega Dreamcast.
 *
 * Copyright (c) 2001, 2002 M. R. Brown <mrbrown@linuxdc.org>
 * Copyright (c) 2002, 2003, 2004 Paul Mundt <lethal@linux-sh.org>
 *
 * This file is part of the LinuxDC project (www.linuxdc.org)
 *
 * Released under the terms of the GNU GPL v2.0.
 *
 * This file originally bore the message (with enclosed-$):
 *	Id: setup_dc.c,v 1.5 2001/05/24 05:09:16 mrbrown Exp
 *	SEGA Dreamcast support
 */

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/rtc.h>
#include <asm/machvec.h>
#include <asm/mach/sysasic.h>

extern struct hw_interrupt_type systemasic_int;
extern void aica_time_init(void);
extern int gapspci_init(void);
extern int systemasic_irq_demux(int);

void *dreamcast_consistent_alloc(struct device *, size_t, dma_addr_t *, gfp_t);
int dreamcast_consistent_free(struct device *, size_t, void *, dma_addr_t);

static void __init dreamcast_setup(char **cmdline_p)
{
	int i;

	/* Mask all hardware events */
	/* XXX */

	/* Acknowledge any previous events */
	/* XXX */

	__set_io_port_base(0xa0000000);

	/* Assign all virtual IRQs to the System ASIC int. handler */
	for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++)
		irq_desc[i].chip = &systemasic_int;

	board_time_init = aica_time_init;

#ifdef CONFIG_PCI
	if (gapspci_init() < 0)
		printk(KERN_WARNING "GAPSPCI was not detected.\n");
#endif
}

static struct sh_machine_vector mv_dreamcast __initmv = {
	.mv_name		= "Sega Dreamcast",
	.mv_setup		= dreamcast_setup,
	.mv_irq_demux		= systemasic_irq_demux,

#ifdef CONFIG_PCI
	.mv_consistent_alloc	= dreamcast_consistent_alloc,
	.mv_consistent_free	= dreamcast_consistent_free,
#endif
};