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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.

/* $Id: irq.h,v 1.21 2002/01/23 11:27:36 davem Exp $
 * irq.h: IRQ registers on the 64-bit Sparc.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
 */

#ifndef _SPARC64_IRQ_H
#define _SPARC64_IRQ_H

#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <asm/pil.h>
#include <asm/ptrace.h>

/* IMAP/ICLR register defines */
#define IMAP_VALID		0x80000000	/* IRQ Enabled		*/
#define IMAP_TID_UPA		0x7c000000	/* UPA TargetID		*/
#define IMAP_TID_JBUS		0x7c000000	/* JBUS TargetID	*/
#define IMAP_TID_SHIFT		26
#define IMAP_AID_SAFARI		0x7c000000	/* Safari AgentID	*/
#define IMAP_AID_SHIFT		26
#define IMAP_NID_SAFARI		0x03e00000	/* Safari NodeID	*/
#define IMAP_NID_SHIFT		21
#define IMAP_IGN		0x000007c0	/* IRQ Group Number	*/
#define IMAP_INO		0x0000003f	/* IRQ Number		*/
#define IMAP_INR		0x000007ff	/* Full interrupt number*/

#define ICLR_IDLE		0x00000000	/* Idle state		*/
#define ICLR_TRANSMIT		0x00000001	/* Transmit state	*/
#define ICLR_PENDING		0x00000003	/* Pending state	*/

/* The largest number of unique interrupt sources we support.
 * If this needs to ever be larger than 255, you need to change
 * the type of ino_bucket->virt_irq as appropriate.
 *
 * ino_bucket->virt_irq allocation is made during {sun4v_,}build_irq().
 */
#define NR_IRQS    255

extern void irq_install_pre_handler(int virt_irq,
				    void (*func)(unsigned int, void *, void *),
				    void *arg1, void *arg2);
#define irq_canonicalize(irq)	(irq)
extern unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap);
extern unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino);
extern unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino);
extern unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
				    unsigned int msi_devino_start,
				    unsigned int msi_devino_end);
extern void sun4v_destroy_msi(unsigned int virt_irq);
extern unsigned int sbus_build_irq(void *sbus, unsigned int ino);

extern void fixup_irqs(void);

static __inline__ void set_softint(unsigned long bits)
{
	__asm__ __volatile__("wr	%0, 0x0, %%set_softint"
			     : /* No outputs */
			     : "r" (bits));
}

static __inline__ void clear_softint(unsigned long bits)
{
	__asm__ __volatile__("wr	%0, 0x0, %%clear_softint"
			     : /* No outputs */
			     : "r" (bits));
}

static __inline__ unsigned long get_softint(void)
{
	unsigned long retval;

	__asm__ __volatile__("rd	%%softint, %0"
			     : "=r" (retval));
	return retval;
}

#endif