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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 __ASM_IA64_IOSAPIC_H
#define __ASM_IA64_IOSAPIC_H

#define	IOSAPIC_REG_SELECT	0x0
#define	IOSAPIC_WINDOW		0x10
#define	IOSAPIC_EOI		0x40

#define	IOSAPIC_VERSION		0x1

/*
 * Redirection table entry
 */
#define	IOSAPIC_RTE_LOW(i)	(0x10+i*2)
#define	IOSAPIC_RTE_HIGH(i)	(0x11+i*2)

#define	IOSAPIC_DEST_SHIFT		16

/*
 * Delivery mode
 */
#define	IOSAPIC_DELIVERY_SHIFT		8
#define	IOSAPIC_FIXED			0x0
#define	IOSAPIC_LOWEST_PRIORITY	0x1
#define	IOSAPIC_PMI			0x2
#define	IOSAPIC_NMI			0x4
#define	IOSAPIC_INIT			0x5
#define	IOSAPIC_EXTINT			0x7

/*
 * Interrupt polarity
 */
#define	IOSAPIC_POLARITY_SHIFT		13
#define	IOSAPIC_POL_HIGH		0
#define	IOSAPIC_POL_LOW		1

/*
 * Trigger mode
 */
#define	IOSAPIC_TRIGGER_SHIFT		15
#define	IOSAPIC_EDGE			0
#define	IOSAPIC_LEVEL			1

/*
 * Mask bit
 */

#define	IOSAPIC_MASK_SHIFT		16
#define	IOSAPIC_MASK			(1<<IOSAPIC_MASK_SHIFT)

#define IOSAPIC_VECTOR_MASK		0xffffff00

#ifndef __ASSEMBLY__

#ifdef CONFIG_IOSAPIC

#define NR_IOSAPICS			256

static inline unsigned int __iosapic_read(char __iomem *iosapic, unsigned int reg)
{
	writel(reg, iosapic + IOSAPIC_REG_SELECT);
	return readl(iosapic + IOSAPIC_WINDOW);
}

static inline void __iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
{
	writel(reg, iosapic + IOSAPIC_REG_SELECT);
	writel(val, iosapic + IOSAPIC_WINDOW);
}

static inline void iosapic_eoi(char __iomem *iosapic, u32 vector)
{
	writel(vector, iosapic + IOSAPIC_EOI);
}

extern void __init iosapic_system_init (int pcat_compat);
extern int __devinit iosapic_init (unsigned long address,
				    unsigned int gsi_base);
#ifdef CONFIG_HOTPLUG
extern int iosapic_remove (unsigned int gsi_base);
#else
#define iosapic_remove(gsi_base)				(-EINVAL)
#endif /* CONFIG_HOTPLUG */
extern int gsi_to_vector (unsigned int gsi);
extern int gsi_to_irq (unsigned int gsi);
extern int iosapic_register_intr (unsigned int gsi, unsigned long polarity,
				  unsigned long trigger);
extern void iosapic_unregister_intr (unsigned int irq);
extern void __devinit iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
				      unsigned long polarity,
				      unsigned long trigger);
extern int __init iosapic_register_platform_intr (u32 int_type,
					   unsigned int gsi,
					   int pmi_vector,
					   u16 eid, u16 id,
					   unsigned long polarity,
					   unsigned long trigger);
extern unsigned int iosapic_version (char __iomem *addr);

#ifdef CONFIG_NUMA
extern void __devinit map_iosapic_to_node (unsigned int, int);
#endif
#else
#define iosapic_system_init(pcat_compat)			do { } while (0)
#define iosapic_init(address,gsi_base)				(-EINVAL)
#define iosapic_remove(gsi_base)				(-ENODEV)
#define iosapic_register_intr(gsi,polarity,trigger)		(gsi)
#define iosapic_unregister_intr(irq)				do { } while (0)
#define iosapic_override_isa_irq(isa_irq,gsi,polarity,trigger)	do { } while (0)
#define iosapic_register_platform_intr(type,gsi,pmi,eid,id, \
	polarity,trigger)					(gsi)
#endif

# endif /* !__ASSEMBLY__ */
#endif /* __ASM_IA64_IOSAPIC_H */