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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.

/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#ifndef EXPR_H
#define EXPR_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#ifndef __cplusplus
#include <stdbool.h>
#endif

struct file {
	struct file *next;
	struct file *parent;
	char *name;
	int lineno;
	int flags;
};

#define FILE_BUSY		0x0001
#define FILE_SCANNED		0x0002
#define FILE_PRINTED		0x0004

typedef enum tristate {
	no, mod, yes
} tristate;

enum expr_type {
	E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_CHOICE, E_SYMBOL, E_RANGE
};

union expr_data {
	struct expr *expr;
	struct symbol *sym;
};

struct expr {
	enum expr_type type;
	union expr_data left, right;
};

#define E_OR(dep1, dep2)	(((dep1)>(dep2))?(dep1):(dep2))
#define E_AND(dep1, dep2)	(((dep1)<(dep2))?(dep1):(dep2))
#define E_NOT(dep)		(2-(dep))

struct expr_value {
	struct expr *expr;
	tristate tri;
};

struct symbol_value {
	void *val;
	tristate tri;
};

enum symbol_type {
	S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
};

enum {
	S_DEF_USER,		/* main user value */
	S_DEF_AUTO,
};

struct symbol {
	struct symbol *next;
	char *name;
	enum symbol_type type;
	struct symbol_value curr;
	struct symbol_value def[4];
	tristate visible;
	int flags;
	struct property *prop;
	struct expr_value rev_dep;
};

#define for_all_symbols(i, sym) for (i = 0; i < 257; i++) for (sym = symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER)

#define SYMBOL_CONST		0x0001
#define SYMBOL_CHECK		0x0008
#define SYMBOL_CHOICE		0x0010
#define SYMBOL_CHOICEVAL	0x0020
#define SYMBOL_PRINTED		0x0040
#define SYMBOL_VALID		0x0080
#define SYMBOL_OPTIONAL		0x0100
#define SYMBOL_WRITE		0x0200
#define SYMBOL_CHANGED		0x0400
#define SYMBOL_AUTO		0x1000
#define SYMBOL_CHECKED		0x2000
#define SYMBOL_WARNED		0x8000
#define SYMBOL_DEF		0x10000
#define SYMBOL_DEF_USER		0x10000
#define SYMBOL_DEF_AUTO		0x20000
#define SYMBOL_DEF3		0x40000
#define SYMBOL_DEF4		0x80000

#define SYMBOL_MAXLENGTH	256
#define SYMBOL_HASHSIZE		257
#define SYMBOL_HASHMASK		0xff

enum prop_type {
	P_UNKNOWN, P_PROMPT, P_COMMENT, P_MENU, P_DEFAULT, P_CHOICE, P_SELECT, P_RANGE
};

struct property {
	struct property *next;
	struct symbol *sym;
	enum prop_type type;
	const char *text;
	struct expr_value visible;
	struct expr *expr;
	struct menu *menu;
	struct file *file;
	int lineno;
};

#define for_all_properties(sym, st, tok) \
	for (st = sym->prop; st; st = st->next) \
		if (st->type == (tok))
#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
#define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
#define for_all_prompts(sym, st) \
	for (st = sym->prop; st; st = st->next) \
		if (st->text)

struct menu {
	struct menu *next;
	struct menu *parent;
	struct menu *list;
	struct symbol *sym;
	struct property *prompt;
	struct expr *dep;
	unsigned int flags;
	char *help;
	struct file *file;
	int lineno;
	void *data;
};

#define MENU_CHANGED		0x0001
#define MENU_ROOT		0x0002

#ifndef SWIG

extern struct file *file_list;
extern struct file *current_file;
struct file *lookup_file(const char *name);

extern struct symbol symbol_yes, symbol_no, symbol_mod;
extern struct symbol *modules_sym;
extern struct symbol *sym_defconfig_list;
extern int cdebug;
struct expr *expr_alloc_symbol(struct symbol *sym);
struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
struct expr *expr_copy(struct expr *org);
void expr_free(struct expr *e);
int expr_eq(struct expr *e1, struct expr *e2);
void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
tristate expr_calc_value(struct expr *e);
struct expr *expr_eliminate_yn(struct expr *e);
struct expr *expr_trans_bool(struct expr *e);
struct expr *expr_eliminate_dups(struct expr *e);
struct expr *expr_transform(struct expr *e);
int expr_contains_symbol(struct expr *dep, struct symbol *sym);
bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);
struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);
void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);
struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);

void expr_fprint(struct expr *e, FILE *out);
struct gstr; /* forward */
void expr_gstr_print(struct expr *e, struct gstr *gs);

static inline int expr_is_yes(struct expr *e)
{
	return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
}

static inline int expr_is_no(struct expr *e)
{
	return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
}
#endif

#ifdef __cplusplus
}
#endif

#endif /* EXPR_H */