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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, 2001, 2002, 2003 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <asm/processor.h>

#include "cfe_api.h"
#include "cfe_error.h"

/*
 * Use CFE to find out how many CPUs are available, setting up
 * phys_cpu_present_map and the logical/physical mappings.
 * XXXKW will the boot CPU ever not be physical 0?
 *
 * Common setup before any secondaries are started
 */
void __init plat_smp_setup(void)
{
	int i, num;

	cpus_clear(phys_cpu_present_map);
	cpu_set(0, phys_cpu_present_map);
	__cpu_number_map[0] = 0;
	__cpu_logical_map[0] = 0;

	for (i = 1, num = 0; i < NR_CPUS; i++) {
		if (cfe_cpu_stop(i) == 0) {
			cpu_set(i, phys_cpu_present_map);
			__cpu_number_map[i] = ++num;
			__cpu_logical_map[num] = i;
		}
	}
	printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
}

void __init plat_prepare_cpus(unsigned int max_cpus)
{
}

/*
 * Setup the PC, SP, and GP of a secondary processor and start it
 * running!
 */
void __cpuinit prom_boot_secondary(int cpu, struct task_struct *idle)
{
	int retval;

	retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap,
			       __KSTK_TOS(idle),
			       (unsigned long)task_thread_info(idle), 0);
	if (retval != 0)
		printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
}

/*
 * Code to run on secondary just after probing the CPU
 */
void __cpuinit prom_init_secondary(void)
{
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
	extern void bcm1480_smp_init(void);
	bcm1480_smp_init();
#elif defined(CONFIG_SIBYTE_SB1250)
	extern void sb1250_smp_init(void);
	sb1250_smp_init();
#else
#error invalid SMP configuration
#endif
}

/*
 * Do any tidying up before marking online and running the idle
 * loop
 */
void __cpuinit prom_smp_finish(void)
{
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
	extern void bcm1480_smp_finish(void);
	bcm1480_smp_finish();
#elif defined(CONFIG_SIBYTE_SB1250)
	extern void sb1250_smp_finish(void);
	sb1250_smp_finish();
#else
#error invalid SMP configuration
#endif
}

/*
 * Final cleanup after all secondaries booted
 */
void prom_cpus_done(void)
{
}