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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 _ASM_POWERPC_KPROBES_H
#define _ASM_POWERPC_KPROBES_H
#ifdef __KERNEL__
/*
 *  Kernel Probes (KProbes)
 *
 * 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.
 *
 * Copyright (C) IBM Corporation, 2002, 2004
 *
 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
 *		Probes initial implementation ( includes suggestions from
 *		Rusty Russell).
 * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
 *		<ananth@in.ibm.com>
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>

#define  __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

typedef unsigned int kprobe_opcode_t;
#define BREAKPOINT_INSTRUCTION	0x7fe00008	/* trap */
#define MAX_INSN_SIZE 1

#define IS_TW(instr)		(((instr) & 0xfc0007fe) == 0x7c000008)
#define IS_TD(instr)		(((instr) & 0xfc0007fe) == 0x7c000088)
#define IS_TDI(instr)		(((instr) & 0xfc000000) == 0x08000000)
#define IS_TWI(instr)		(((instr) & 0xfc000000) == 0x0c000000)

#ifdef CONFIG_PPC64
/*
 * 64bit powerpc uses function descriptors.
 * Handle cases where:
 * 		- User passes a <.symbol> or <module:.symbol>
 * 		- User passes a <symbol> or <module:symbol>
 * 		- User passes a non-existant symbol, kallsyms_lookup_name
 * 		  returns 0. Don't deref the NULL pointer in that case
 */
#define kprobe_lookup_name(name, addr)					\
{									\
	addr = (kprobe_opcode_t *)kallsyms_lookup_name(name);		\
	if (addr) {							\
		char *colon;						\
		if ((colon = strchr(name, ':')) != NULL) {		\
			colon++;					\
			if (*colon != '\0' && *colon != '.')		\
				addr = *(kprobe_opcode_t **)addr;	\
		} else if (name[0] != '.')				\
			addr = *(kprobe_opcode_t **)addr;		\
	} else {							\
		char dot_name[KSYM_NAME_LEN];				\
		dot_name[0] = '.';					\
		dot_name[1] = '\0';					\
		strncat(dot_name, name, KSYM_NAME_LEN - 2);		\
		addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
	}								\
}

#define is_trap(instr)	(IS_TW(instr) || IS_TD(instr) || \
			IS_TWI(instr) || IS_TDI(instr))
#else
/* Use stock kprobe_lookup_name since ppc32 doesn't use function descriptors */
#define is_trap(instr)	(IS_TW(instr) || IS_TWI(instr))
#endif

#define ARCH_SUPPORTS_KRETPROBES
#define  ARCH_INACTIVE_KPROBE_COUNT 1
#define flush_insn_slot(p)	do { } while (0)

void kretprobe_trampoline(void);
extern void arch_remove_kprobe(struct kprobe *p);

/* Architecture specific copy of original instruction */
struct arch_specific_insn {
	/* copy of original instruction */
	kprobe_opcode_t *insn;
	/*
	 * Set in kprobes code, initially to 0. If the instruction can be
	 * eumulated, this is set to 1, if not, to -1.
	 */
	int boostable;
};

struct prev_kprobe {
	struct kprobe *kp;
	unsigned long status;
	unsigned long saved_msr;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	unsigned long kprobe_saved_msr;
	struct pt_regs jprobe_saved_regs;
	struct prev_kprobe prev_kprobe;
};

extern int kprobe_exceptions_notify(struct notifier_block *self,
					unsigned long val, void *data);
extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
#endif /* __KERNEL__ */
#endif	/* _ASM_POWERPC_KPROBES_H */