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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_KPROBES_H
#define _ASM_KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *  include/asm-ia64/kprobes.h
 *
 * 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
 * Copyright (C) Intel Corporation, 2005
 *
 * 2005-Apr     Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy
 *              <anil.s.keshavamurthy@intel.com> adapted from i386
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>
#include <asm/break.h>

#define __ARCH_WANT_KPROBES_INSN_SLOT
#define MAX_INSN_SIZE   1
#define BREAK_INST	(long)(__IA64_BREAK_KPROBE << 6)

typedef union cmp_inst {
	struct {
	unsigned long long qp : 6;
	unsigned long long p1 : 6;
	unsigned long long c  : 1;
	unsigned long long r2 : 7;
	unsigned long long r3 : 7;
	unsigned long long p2 : 6;
	unsigned long long ta : 1;
	unsigned long long x2 : 2;
	unsigned long long tb : 1;
	unsigned long long opcode : 4;
	unsigned long long reserved : 23;
	}f;
	unsigned long long l;
} cmp_inst_t;

struct kprobe;

typedef struct _bundle {
	struct {
		unsigned long long template : 5;
		unsigned long long slot0 : 41;
		unsigned long long slot1_p0 : 64-46;
	} quad0;
	struct {
		unsigned long long slot1_p1 : 41 - (64-46);
		unsigned long long slot2 : 41;
	} quad1;
} __attribute__((__aligned__(16)))  bundle_t;

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

#define	MAX_PARAM_RSE_SIZE	(0x60+0x60/0x3f)
/* per-cpu kprobe control block */
#define ARCH_PREV_KPROBE_SZ 2
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	struct pt_regs jprobe_saved_regs;
	unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE];
	unsigned long *bsp;
	unsigned long cfm;
	atomic_t prev_kprobe_index;
	struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
};

#define ARCH_SUPPORTS_KRETPROBES
#define  ARCH_INACTIVE_KPROBE_COUNT 1

#define SLOT0_OPCODE_SHIFT	(37)
#define SLOT1_p1_OPCODE_SHIFT	(37 - (64-46))
#define SLOT2_OPCODE_SHIFT 	(37)

#define INDIRECT_CALL_OPCODE		(1)
#define IP_RELATIVE_CALL_OPCODE		(5)
#define IP_RELATIVE_BRANCH_OPCODE	(4)
#define IP_RELATIVE_PREDICT_OPCODE	(7)
#define LONG_BRANCH_OPCODE		(0xC)
#define LONG_CALL_OPCODE		(0xD)
#define flush_insn_slot(p)		do { } while (0)

typedef struct kprobe_opcode {
	bundle_t bundle;
} kprobe_opcode_t;

struct fnptr {
	unsigned long ip;
	unsigned long gp;
};

/* Architecture specific copy of original instruction*/
struct arch_specific_insn {
	/* copy of the instruction to be emulated */
	kprobe_opcode_t *insn;
 #define INST_FLAG_FIX_RELATIVE_IP_ADDR		1
 #define INST_FLAG_FIX_BRANCH_REG		2
 #define INST_FLAG_BREAK_INST			4
 	unsigned long inst_flag;
 	unsigned short target_br_reg;
	unsigned short slot;
};

extern int kprobes_fault_handler(struct pt_regs *regs, int trapnr);
extern int kprobe_exceptions_notify(struct notifier_block *self,
				    unsigned long val, void *data);

/* ia64 does not need this */
static inline void jprobe_return(void)
{
}
extern void invalidate_stacked_regs(void);
extern void flush_register_stack(void);
extern void arch_remove_kprobe(struct kprobe *p);

#endif				/* _ASM_KPROBES_H */