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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 _ALPHA_IRQ_H
#define _ALPHA_IRQ_H

/*
 *	linux/include/alpha/irq.h
 *
 *	(C) 1994 Linus Torvalds
 */

#include <linux/linkage.h>

#if   defined(CONFIG_ALPHA_GENERIC)

/* Here NR_IRQS is not exact, but rather an upper bound.  This is used
   many places throughout the kernel to size static arrays.  That's ok,
   we'll use alpha_mv.nr_irqs when we want the real thing.  */

/* When LEGACY_START_ADDRESS is selected, we leave out:
     TITAN
     WILDFIRE
     MARVEL

   This helps keep the kernel object size reasonable for the majority
   of machines.
*/

# if defined(CONFIG_ALPHA_LEGACY_START_ADDRESS)
#  define NR_IRQS      (128)           /* max is RAWHIDE/TAKARA */
# else
#  define NR_IRQS      (32768 + 16)    /* marvel - 32 pids */
# endif

#elif defined(CONFIG_ALPHA_CABRIOLET) || \
      defined(CONFIG_ALPHA_EB66P)     || \
      defined(CONFIG_ALPHA_EB164)     || \
      defined(CONFIG_ALPHA_PC164)     || \
      defined(CONFIG_ALPHA_LX164)
# define NR_IRQS	35

#elif defined(CONFIG_ALPHA_EB66)      || \
      defined(CONFIG_ALPHA_EB64P)     || \
      defined(CONFIG_ALPHA_MIKASA)
# define NR_IRQS	32

#elif defined(CONFIG_ALPHA_ALCOR)     || \
      defined(CONFIG_ALPHA_MIATA)     || \
      defined(CONFIG_ALPHA_RUFFIAN)   || \
      defined(CONFIG_ALPHA_RX164)     || \
      defined(CONFIG_ALPHA_NORITAKE)
# define NR_IRQS	48

#elif defined(CONFIG_ALPHA_SABLE)     || \
      defined(CONFIG_ALPHA_SX164)
# define NR_IRQS	40

#elif defined(CONFIG_ALPHA_DP264) || \
      defined(CONFIG_ALPHA_LYNX)  || \
      defined(CONFIG_ALPHA_SHARK) || \
      defined(CONFIG_ALPHA_EIGER)
# define NR_IRQS	64

#elif defined(CONFIG_ALPHA_TITAN)
#define NR_IRQS		80

#elif defined(CONFIG_ALPHA_RAWHIDE) || \
	defined(CONFIG_ALPHA_TAKARA)
# define NR_IRQS	128

#elif defined(CONFIG_ALPHA_WILDFIRE)
# define NR_IRQS	2048 /* enuff for 8 QBBs */

#elif defined(CONFIG_ALPHA_MARVEL)
# define NR_IRQS	(32768 + 16) 	/* marvel - 32 pids*/

#else /* everyone else */
# define NR_IRQS	16
#endif

static __inline__ int irq_canonicalize(int irq)
{
	/*
	 * XXX is this true for all Alpha's?  The old serial driver
	 * did it this way for years without any complaints, so....
	 */
	return ((irq == 2) ? 9 : irq);
}

struct pt_regs;
extern void (*perf_irq)(unsigned long, struct pt_regs *);

#endif /* _ALPHA_IRQ_H */