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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.

/*
 * 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.
 *
 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
 * Copyright (C) 2000, 2001, 2002 Ralf Baechle
 * Copyright (C) 2000, 2001 Broadcom Corporation
 */
#ifndef __ASM_SMP_H
#define __ASM_SMP_H


#ifdef CONFIG_SMP

#include <linux/bitops.h>
#include <linux/linkage.h>
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <asm/atomic.h>

#define raw_smp_processor_id() (current_thread_info()->cpu)

/* Map from cpu id to sequential logical cpu number.  This will only
   not be idempotent when cpus failed to come on-line.  */
extern int __cpu_number_map[NR_CPUS];
#define cpu_number_map(cpu)  __cpu_number_map[cpu]

/* The reverse map from sequential logical cpu number to cpu id.  */
extern int __cpu_logical_map[NR_CPUS];
#define cpu_logical_map(cpu)  __cpu_logical_map[cpu]

#define NO_PROC_ID	(-1)

struct call_data_struct {
	void		(*func)(void *);
	void		*info;
	atomic_t	started;
	atomic_t	finished;
	int		wait;
};

extern struct call_data_struct *call_data;

#define SMP_RESCHEDULE_YOURSELF	0x1	/* XXX braindead */
#define SMP_CALL_FUNCTION	0x2

extern cpumask_t phys_cpu_present_map;
#define cpu_possible_map	phys_cpu_present_map

/*
 * These are defined by the board-specific code.
 */

/*
 * Cause the function described by call_data to be executed on the passed
 * cpu.  When the function has finished, increment the finished field of
 * call_data.
 */
extern void core_send_ipi(int cpu, unsigned int action);

/*
 * Firmware CPU startup hook
 */
extern void prom_boot_secondary(int cpu, struct task_struct *idle);

/*
 *  After we've done initial boot, this function is called to allow the
 *  board code to clean up state, if needed
 */
extern void prom_init_secondary(void);

/*
 * Populate cpu_possible_map before smp_init, called from setup_arch.
 */
extern void plat_smp_setup(void);

/*
 * Called in smp_prepare_cpus.
 */
extern void plat_prepare_cpus(unsigned int max_cpus);

/*
 * Last chance for the board code to finish SMP initialization before
 * the CPU is "online".
 */
extern void prom_smp_finish(void);

/* Hook for after all CPUs are online */
extern void prom_cpus_done(void);

extern void asmlinkage smp_bootstrap(void);

/*
 * this function sends a 'reschedule' IPI to another CPU.
 * it goes straight through and wastes no time serializing
 * anything. Worst case is that we lose a reschedule ...
 */
static inline void smp_send_reschedule(int cpu)
{
	core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
}

extern asmlinkage void smp_call_function_interrupt(void);

#endif /* CONFIG_SMP */

#endif /* __ASM_SMP_H */