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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 _SPARC64_LDC_H
#define _SPARC64_LDC_H

#include <asm/hypervisor.h>

extern int ldom_domaining_enabled;
extern void ldom_set_var(const char *var, const char *value);
extern void ldom_reboot(const char *boot_command);
extern void ldom_power_off(void);

/* The event handler will be evoked when link state changes
 * or data becomes available on the receive side.
 *
 * For non-RAW links, if the LDC_EVENT_RESET event arrives the
 * driver should reset all of it's internal state and reinvoke
 * ldc_connect() to try and bring the link up again.
 *
 * For RAW links, ldc_connect() is not used.  Instead the driver
 * just waits for the LDC_EVENT_UP event.
 */
struct ldc_channel_config {
	void (*event)(void *arg, int event);

	u32			mtu;
	unsigned int		rx_irq;
	unsigned int		tx_irq;
	u8			mode;
#define LDC_MODE_RAW		0x00
#define LDC_MODE_UNRELIABLE	0x01
#define LDC_MODE_RESERVED	0x02
#define LDC_MODE_STREAM		0x03

	u8			debug;
#define LDC_DEBUG_HS		0x01
#define LDC_DEBUG_STATE		0x02
#define LDC_DEBUG_RX		0x04
#define LDC_DEBUG_TX		0x08
#define LDC_DEBUG_DATA		0x10
};

#define LDC_EVENT_RESET		0x01
#define LDC_EVENT_UP		0x02
#define LDC_EVENT_DATA_READY	0x04

#define LDC_STATE_INVALID	0x00
#define LDC_STATE_INIT		0x01
#define LDC_STATE_BOUND		0x02
#define LDC_STATE_READY		0x03
#define LDC_STATE_CONNECTED	0x04

struct ldc_channel;

/* Allocate state for a channel.  */
extern struct ldc_channel *ldc_alloc(unsigned long id,
				     const struct ldc_channel_config *cfgp,
				     void *event_arg);

/* Shut down and free state for a channel.  */
extern void ldc_free(struct ldc_channel *lp);

/* Register TX and RX queues of the link with the hypervisor.  */
extern int ldc_bind(struct ldc_channel *lp, const char *name);

/* For non-RAW protocols we need to complete a handshake before
 * communication can proceed.  ldc_connect() does that, if the
 * handshake completes successfully, an LDC_EVENT_UP event will
 * be sent up to the driver.
 */
extern int ldc_connect(struct ldc_channel *lp);
extern int ldc_disconnect(struct ldc_channel *lp);

extern int ldc_state(struct ldc_channel *lp);

/* Read and write operations.  Only valid when the link is up.  */
extern int ldc_write(struct ldc_channel *lp, const void *buf,
		     unsigned int size);
extern int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size);

#define LDC_MAP_SHADOW	0x01
#define LDC_MAP_DIRECT	0x02
#define LDC_MAP_IO	0x04
#define LDC_MAP_R	0x08
#define LDC_MAP_W	0x10
#define LDC_MAP_X	0x20
#define LDC_MAP_RW	(LDC_MAP_R | LDC_MAP_W)
#define LDC_MAP_RWX	(LDC_MAP_R | LDC_MAP_W | LDC_MAP_X)
#define LDC_MAP_ALL	0x03f

struct ldc_trans_cookie {
	u64			cookie_addr;
	u64			cookie_size;
};

struct scatterlist;
extern int ldc_map_sg(struct ldc_channel *lp,
		      struct scatterlist *sg, int num_sg,
		      struct ldc_trans_cookie *cookies, int ncookies,
		      unsigned int map_perm);

extern int ldc_map_single(struct ldc_channel *lp,
			  void *buf, unsigned int len,
			  struct ldc_trans_cookie *cookies, int ncookies,
			  unsigned int map_perm);

extern void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
		      int ncookies);

extern int ldc_copy(struct ldc_channel *lp, int copy_dir,
		    void *buf, unsigned int len, unsigned long offset,
		    struct ldc_trans_cookie *cookies, int ncookies);

static inline int ldc_get_dring_entry(struct ldc_channel *lp,
				      void *buf, unsigned int len,
				      unsigned long offset,
				      struct ldc_trans_cookie *cookies,
				      int ncookies)
{
	return ldc_copy(lp, LDC_COPY_IN, buf, len, offset, cookies, ncookies);
}

static inline int ldc_put_dring_entry(struct ldc_channel *lp,
				      void *buf, unsigned int len,
				      unsigned long offset,
				      struct ldc_trans_cookie *cookies,
				      int ncookies)
{
	return ldc_copy(lp, LDC_COPY_OUT, buf, len, offset, cookies, ncookies);
}

extern void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
				 struct ldc_trans_cookie *cookies,
				 int *ncookies, unsigned int map_perm);

extern void ldc_free_exp_dring(struct ldc_channel *lp, void *buf,
			       unsigned int len,
			       struct ldc_trans_cookie *cookies, int ncookies);

#endif /* _SPARC64_LDC_H */