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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.

#ifndef _LINUX_REBOOT_H
#define _LINUX_REBOOT_H

/*
 * Magic values required to use _reboot() system call.
 */

#define	LINUX_REBOOT_MAGIC1	0xfee1dead
#define	LINUX_REBOOT_MAGIC2	672274793
#define	LINUX_REBOOT_MAGIC2A	85072278
#define	LINUX_REBOOT_MAGIC2B	369367448
#define	LINUX_REBOOT_MAGIC2C	537993216


/*
 * Commands accepted by the _reboot() system call.
 *
 * RESTART     Restart system using default command and mode.
 * HALT        Stop OS and give system control to ROM monitor, if any.
 * CAD_ON      Ctrl-Alt-Del sequence causes RESTART command.
 * CAD_OFF     Ctrl-Alt-Del sequence sends SIGINT to init task.
 * POWER_OFF   Stop OS and remove all power from system, if possible.
 * RESTART2    Restart system using given command string.
 * SW_SUSPEND  Suspend system using software suspend if compiled in.
 * KEXEC       Restart system using a previously loaded Linux kernel
 */

#define	LINUX_REBOOT_CMD_RESTART	0x01234567
#define	LINUX_REBOOT_CMD_HALT		0xCDEF0123
#define	LINUX_REBOOT_CMD_CAD_ON		0x89ABCDEF
#define	LINUX_REBOOT_CMD_CAD_OFF	0x00000000
#define	LINUX_REBOOT_CMD_POWER_OFF	0x4321FEDC
#define	LINUX_REBOOT_CMD_RESTART2	0xA1B2C3D4
#define	LINUX_REBOOT_CMD_SW_SUSPEND	0xD000FCE2
#define	LINUX_REBOOT_CMD_KEXEC		0x45584543


#ifdef __KERNEL__

#include <linux/notifier.h>

extern int register_reboot_notifier(struct notifier_block *);
extern int unregister_reboot_notifier(struct notifier_block *);


/*
 * Architecture-specific implementations of sys_reboot commands.
 */

extern void machine_restart(char *cmd);
extern void machine_halt(void);
extern void machine_power_off(void);

extern void machine_shutdown(void);
struct pt_regs;
extern void machine_crash_shutdown(struct pt_regs *);

/* 
 * Architecture independent implemenations of sys_reboot commands.
 */

extern void kernel_shutdown_prepare(enum system_states state);

extern void kernel_restart(char *cmd);
extern void kernel_halt(void);
extern void kernel_power_off(void);

void ctrl_alt_del(void);

#define POWEROFF_CMD_PATH_LEN	256
extern char poweroff_cmd[POWEROFF_CMD_PATH_LEN];

extern int orderly_poweroff(bool force);

/*
 * Emergency restart, callable from an interrupt handler.
 */

extern void emergency_restart(void);
#include <asm/emergency-restart.h>

#endif

#endif /* _LINUX_REBOOT_H */