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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 _M68K_IRQ_H_
#define _M68K_IRQ_H_

#include <linux/linkage.h>
#include <linux/hardirq.h>
#include <linux/spinlock_types.h>

/*
 * This should be the same as the max(NUM_X_SOURCES) for all the
 * different m68k hosts compiled into the kernel.
 * Currently the Atari has 72 and the Amiga 24, but if both are
 * supported in the kernel it is better to make room for 72.
 */
#if defined(CONFIG_VME) || defined(CONFIG_SUN3) || defined(CONFIG_SUN3X)
#define NR_IRQS 200
#elif defined(CONFIG_ATARI) || defined(CONFIG_MAC)
#define NR_IRQS 72
#elif defined(CONFIG_Q40)
#define NR_IRQS	43
#elif defined(CONFIG_AMIGA)
#define NR_IRQS	32
#elif defined(CONFIG_APOLLO)
#define NR_IRQS	24
#elif defined(CONFIG_HP300)
#define NR_IRQS	8
#else
#error unknown nr of irqs
#endif

/*
 * The hardirq mask has to be large enough to have
 * space for potentially all IRQ sources in the system
 * nesting on a single CPU:
 */
#if (1 << HARDIRQ_BITS) < NR_IRQS
# error HARDIRQ_BITS is too low!
#endif

/*
 * Interrupt source definitions
 * General interrupt sources are the level 1-7.
 * Adding an interrupt service routine for one of these sources
 * results in the addition of that routine to a chain of routines.
 * Each one is called in succession.  Each individual interrupt
 * service routine should determine if the device associated with
 * that routine requires service.
 */

#define IRQ_SPURIOUS	0

#define IRQ_AUTO_1	1	/* level 1 interrupt */
#define IRQ_AUTO_2	2	/* level 2 interrupt */
#define IRQ_AUTO_3	3	/* level 3 interrupt */
#define IRQ_AUTO_4	4	/* level 4 interrupt */
#define IRQ_AUTO_5	5	/* level 5 interrupt */
#define IRQ_AUTO_6	6	/* level 6 interrupt */
#define IRQ_AUTO_7	7	/* level 7 interrupt (non-maskable) */

#define IRQ_USER	8

extern unsigned int irq_canonicalize(unsigned int irq);

struct pt_regs;

/*
 * various flags for request_irq() - the Amiga now uses the standard
 * mechanism like all other architectures - IRQF_DISABLED and
 * IRQF_SHARED are your friends.
 */
#ifndef MACH_AMIGA_ONLY
#define IRQ_FLG_LOCK	(0x0001)	/* handler is not replaceable	*/
#define IRQ_FLG_REPLACE	(0x0002)	/* replace existing handler	*/
#define IRQ_FLG_FAST	(0x0004)
#define IRQ_FLG_SLOW	(0x0008)
#define IRQ_FLG_STD	(0x8000)	/* internally used		*/
#endif

/*
 * This structure is used to chain together the ISRs for a particular
 * interrupt source (if it supports chaining).
 */
typedef struct irq_node {
	int		(*handler)(int, void *);
	void		*dev_id;
	struct irq_node *next;
	unsigned long	flags;
	const char	*devname;
} irq_node_t;

/*
 * This structure has only 4 elements for speed reasons
 */
struct irq_handler {
	int		(*handler)(int, void *);
	unsigned long	flags;
	void		*dev_id;
	const char	*devname;
};

struct irq_controller {
	const char *name;
	spinlock_t lock;
	int (*startup)(unsigned int irq);
	void (*shutdown)(unsigned int irq);
	void (*enable)(unsigned int irq);
	void (*disable)(unsigned int irq);
};

extern int m68k_irq_startup(unsigned int);
extern void m68k_irq_shutdown(unsigned int);

/*
 * This function returns a new irq_node_t
 */
extern irq_node_t *new_irq_node(void);

extern void m68k_setup_auto_interrupt(void (*handler)(unsigned int, struct pt_regs *));
extern void m68k_setup_user_interrupt(unsigned int vec, unsigned int cnt,
				      void (*handler)(unsigned int, struct pt_regs *));
extern void m68k_setup_irq_controller(struct irq_controller *, unsigned int, unsigned int);

asmlinkage void m68k_handle_int(unsigned int);
asmlinkage void __m68k_handle_int(unsigned int, struct pt_regs *);

#endif /* _M68K_IRQ_H_ */