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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.

/*
 *  include/asm-s390/smp.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *               Heiko Carstens (heiko.carstens@de.ibm.com)
 */
#ifndef __ASM_SMP_H
#define __ASM_SMP_H

#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/bitops.h>

#if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)

#include <asm/lowcore.h>
#include <asm/sigp.h>
#include <asm/ptrace.h>

/*
  s390 specific smp.c headers
 */
typedef struct
{
	int        intresting;
	sigp_ccode ccode; 
	__u32      status;
	__u16      cpu;
} sigp_info;

extern void machine_restart_smp(char *);
extern void machine_halt_smp(void);
extern void machine_power_off_smp(void);

extern void smp_setup_cpu_possible_map(void);

#define NO_PROC_ID		0xFF		/* No processor magic marker */

/*
 *	This magic constant controls our willingness to transfer
 *	a process across CPUs. Such a transfer incurs misses on the L1
 *	cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
 *	gut feeling is this will vary by board in value. For a board
 *	with separate L2 cache it probably depends also on the RSS, and
 *	for a board with shared L2 cache it ought to decay fast as other
 *	processes are run.
 */
 
#define PROC_CHANGE_PENALTY	20		/* Schedule penalty */

#define raw_smp_processor_id()	(S390_lowcore.cpu_data.cpu_nr)

static inline __u16 hard_smp_processor_id(void)
{
        __u16 cpu_address;
 
	asm volatile("stap %0" : "=m" (cpu_address));
        return cpu_address;
}

/*
 * returns 1 if cpu is in stopped/check stopped state or not operational
 * returns 0 otherwise
 */
static inline int
smp_cpu_not_running(int cpu)
{
	__u32 status;

	switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
	case sigp_order_code_accepted:
	case sigp_status_stored:
		/* Check for stopped and check stop state */
		if (status & 0x50)
			return 1;
		break;
	case sigp_not_operational:
		return 1;
	default:
		break;
	}
	return 0;
}

#define cpu_logical_map(cpu) (cpu)

extern int __cpu_disable (void);
extern void __cpu_die (unsigned int cpu);
extern void cpu_die (void) __attribute__ ((noreturn));
extern int __cpu_up (unsigned int cpu);

#endif

#ifndef CONFIG_SMP
static inline void smp_send_stop(void)
{
	/* Disable all interrupts/machine checks */
	__load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
}

#define hard_smp_processor_id()		0
#define smp_cpu_not_running(cpu)	1
#define smp_setup_cpu_possible_map()	do { } while (0)
#endif

extern union save_area *zfcpdump_save_areas[NR_CPUS + 1];
#endif