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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.

/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2005 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */

static __inline__ uint16_t qla2x00_debounce_register(volatile uint16_t __iomem *);
/*
 * qla2x00_debounce_register
 *      Debounce register.
 *
 * Input:
 *      port = register address.
 *
 * Returns:
 *      register value.
 */
static __inline__ uint16_t
qla2x00_debounce_register(volatile uint16_t __iomem *addr)
{
	volatile uint16_t first;
	volatile uint16_t second;

	do {
		first = RD_REG_WORD(addr);
		barrier();
		cpu_relax();
		second = RD_REG_WORD(addr);
	} while (first != second);

	return (first);
}

static __inline__ int qla2x00_normalize_dma_addr(
    dma_addr_t *e_addr,  uint32_t *e_len,
    dma_addr_t *ne_addr, uint32_t *ne_len);

/**
 * qla2x00_normalize_dma_addr() - Normalize an DMA address.
 * @e_addr: Raw DMA address
 * @e_len: Raw DMA length
 * @ne_addr: Normalized second DMA address
 * @ne_len: Normalized second DMA length
 *
 * If the address does not span a 4GB page boundary, the contents of @ne_addr
 * and @ne_len are undefined.  @e_len is updated to reflect a normalization.
 *
 * Example:
 *
 * 	ffffabc0ffffeeee	(e_addr) start of DMA address
 * 	0000000020000000	(e_len)  length of DMA transfer
 *	ffffabc11fffeeed	end of DMA transfer
 *
 * Is the 4GB boundary crossed?
 *
 * 	ffffabc0ffffeeee	(e_addr)
 *	ffffabc11fffeeed	(e_addr + e_len - 1)
 *	00000001e0000003	((e_addr ^ (e_addr + e_len - 1))
 *	0000000100000000	((e_addr ^ (e_addr + e_len - 1)) & ~(0xffffffff)
 *
 * Compute start of second DMA segment:
 *
 * 	ffffabc0ffffeeee	(e_addr)
 *	ffffabc1ffffeeee	(0x100000000 + e_addr)
 *	ffffabc100000000	(0x100000000 + e_addr) & ~(0xffffffff)
 *	ffffabc100000000	(ne_addr)
 *
 * Compute length of second DMA segment:
 *
 *	00000000ffffeeee	(e_addr & 0xffffffff)
 *	0000000000001112	(0x100000000 - (e_addr & 0xffffffff))
 *	000000001fffeeee	(e_len - (0x100000000 - (e_addr & 0xffffffff))
 *	000000001fffeeee	(ne_len)
 *
 * Adjust length of first DMA segment
 *
 * 	0000000020000000	(e_len)
 *	0000000000001112	(e_len - ne_len)
 *	0000000000001112	(e_len)
 *
 * Returns non-zero if the specified address was normalized, else zero.
 */
static __inline__ int
qla2x00_normalize_dma_addr(
    dma_addr_t *e_addr,  uint32_t *e_len,
    dma_addr_t *ne_addr, uint32_t *ne_len)
{
	int normalized;

	normalized = 0;
	if ((*e_addr ^ (*e_addr + *e_len - 1)) & ~(0xFFFFFFFFULL)) {
		/* Compute normalized crossed address and len */
		*ne_addr = (0x100000000ULL + *e_addr) & ~(0xFFFFFFFFULL);
		*ne_len = *e_len - (0x100000000ULL - (*e_addr & 0xFFFFFFFFULL));
		*e_len -= *ne_len;

		normalized++;
	}
	return (normalized);
}

static __inline__ void qla2x00_poll(scsi_qla_host_t *);
static inline void
qla2x00_poll(scsi_qla_host_t *ha)
{
	ha->isp_ops->intr_handler(0, ha);
}

static __inline__ void qla2x00_check_fabric_devices(scsi_qla_host_t *);
/*
 * This routine will wait for fabric devices for
 * the reset delay.
 */
static __inline__ void qla2x00_check_fabric_devices(scsi_qla_host_t *ha)
{
	uint16_t	fw_state;

	qla2x00_get_firmware_state(ha, &fw_state);
}

/**
 * qla2x00_issue_marker() - Issue a Marker IOCB if necessary.
 * @ha: HA context
 * @ha_locked: is function called with the hardware lock
 *
 * Returns non-zero if a failure occured, else zero.
 */
static inline int
qla2x00_issue_marker(scsi_qla_host_t *ha, int ha_locked)
{
	/* Send marker if required */
	if (ha->marker_needed != 0) {
		if (ha_locked) {
			if (__qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) !=
			    QLA_SUCCESS)
				return (QLA_FUNCTION_FAILED);
		} else {
			if (qla2x00_marker(ha, 0, 0, MK_SYNC_ALL) !=
			    QLA_SUCCESS)
				return (QLA_FUNCTION_FAILED);
		}
		ha->marker_needed = 0;
	}
	return (QLA_SUCCESS);
}

static inline uint8_t *host_to_fcp_swap(uint8_t *, uint32_t);
static inline uint8_t *
host_to_fcp_swap(uint8_t *fcp, uint32_t bsize)
{
       uint32_t *ifcp = (uint32_t *) fcp;
       uint32_t *ofcp = (uint32_t *) fcp;
       uint32_t iter = bsize >> 2;

       for (; iter ; iter--)
               *ofcp++ = swab32(*ifcp++);

       return fcp;
}

static inline int qla2x00_is_reserved_id(scsi_qla_host_t *, uint16_t);
static inline int
qla2x00_is_reserved_id(scsi_qla_host_t *ha, uint16_t loop_id)
{
	if (IS_FWI2_CAPABLE(ha))
		return (loop_id > NPH_LAST_HANDLE);

	return ((loop_id > ha->last_loop_id && loop_id < SNS_FIRST_LOOP_ID) ||
	    loop_id == MANAGEMENT_SERVER || loop_id == BROADCAST);
};