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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.

/*
 * linux/include/asm-xtensa/pci.h
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_PCI_H
#define _XTENSA_PCI_H

#ifdef __KERNEL__

/* Can be used to override the logic in pci_scan_bus for skipping
 * already-configured bus numbers - to be used for buggy BIOSes
 * or architectures with incomplete PCI setup by the loader
 */

#define pcibios_assign_all_busses()	0

extern struct pci_controller* pcibios_alloc_controller(void);

static inline void pcibios_set_master(struct pci_dev *dev)
{
	/* No special bus mastering setup handling */
}

static inline void pcibios_penalize_isa_irq(int irq)
{
	/* We don't do dynamic PCI IRQ allocation */
}

/* Assume some values. (We should revise them, if necessary) */

#define PCIBIOS_MIN_IO		0x2000
#define PCIBIOS_MIN_MEM		0x10000000

/* Dynamic DMA mapping stuff.
 * Xtensa has everything mapped statically like x86.
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <asm/scatterlist.h>
#include <linux/string.h>
#include <asm/io.h>

struct pci_dev;

/* The PCI address space does equal the physical memory address space.
 * The networking and block device layers use this boolean for bounce buffer
 * decisions.
 */

#define PCI_DMA_BUS_IS_PHYS	(1)

/* pci_unmap_{page,single} is a no-op, so */
#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
#define pci_unmap_addr(PTR, ADDR_NAME)		(0)
#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)	do { } while (0)
#define pci_ubnmap_len(PTR, LEN_NAME)		(0)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL)	do { } while (0)

/* Map a range of PCI memory or I/O space for a device into user space */
int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma,
                        enum pci_mmap_state mmap_state, int write_combine);

/* Tell drivers/pci/proc.c that we have pci_mmap_page_range() */
#define HAVE_PCI_MMAP	1

#endif /* __KERNEL__ */

/* Implement the pci_ DMA API in terms of the generic device dma_ one */
#include <asm-generic/pci-dma-compat.h>

/* Generic PCI */
#include <asm-generic/pci.h>

#endif	/* _XTENSA_PCI_H */