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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_MDESC_H
#define _SPARC64_MDESC_H

#include <linux/types.h>
#include <linux/cpumask.h>
#include <asm/prom.h>

struct mdesc_handle;

/* Machine description operations are to be surrounded by grab and
 * release calls.  The mdesc_handle returned from the grab is
 * the first argument to all of the operational calls that work
 * on mdescs.
 */
extern struct mdesc_handle *mdesc_grab(void);
extern void mdesc_release(struct mdesc_handle *);

#define MDESC_NODE_NULL		(~(u64)0)

extern u64 mdesc_node_by_name(struct mdesc_handle *handle,
			      u64 from_node, const char *name);
#define mdesc_for_each_node_by_name(__hdl, __node, __name) \
	for (__node = mdesc_node_by_name(__hdl, MDESC_NODE_NULL, __name); \
	     (__node) != MDESC_NODE_NULL; \
	     __node = mdesc_node_by_name(__hdl, __node, __name))

/* Access to property values returned from mdesc_get_property() are
 * only valid inside of a mdesc_grab()/mdesc_release() sequence.
 * Once mdesc_release() is called, the memory backed up by these
 * pointers may reference freed up memory.
 *
 * Therefore callers must make copies of any property values
 * they need.
 *
 * These same rules apply to mdesc_node_name().
 */
extern const void *mdesc_get_property(struct mdesc_handle *handle,
				      u64 node, const char *name, int *lenp);
extern const char *mdesc_node_name(struct mdesc_handle *hp, u64 node);

/* MD arc iteration, the standard sequence is:
 *
 *	unsigned long arc;
 *	mdesc_for_each_arc(arc, handle, node, MDESC_ARC_TYPE_{FWD,BACK}) {
 *		unsigned long target = mdesc_arc_target(handle, arc);
 *		...
 *	}
 */

#define MDESC_ARC_TYPE_FWD	"fwd"
#define MDESC_ARC_TYPE_BACK	"back"

extern u64 mdesc_next_arc(struct mdesc_handle *handle, u64 from,
			  const char *arc_type);
#define mdesc_for_each_arc(__arc, __hdl, __node, __type) \
	for (__arc = mdesc_next_arc(__hdl, __node, __type); \
	     (__arc) != MDESC_NODE_NULL; \
	     __arc = mdesc_next_arc(__hdl, __arc, __type))

extern u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc);

extern void mdesc_update(void);

struct mdesc_notifier_client {
	void (*add)(struct mdesc_handle *handle, u64 node);
	void (*remove)(struct mdesc_handle *handle, u64 node);

	const char			*node_name;
	struct mdesc_notifier_client	*next;
};

extern void mdesc_register_notifier(struct mdesc_notifier_client *client);

extern void mdesc_fill_in_cpu_data(cpumask_t mask);

extern void sun4v_mdesc_init(void);

#endif