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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.

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>

/*
 * Device resource management aware IRQ request/free implementation.
 */
struct irq_devres {
	unsigned int irq;
	void *dev_id;
};

static void devm_irq_release(struct device *dev, void *res)
{
	struct irq_devres *this = res;

	free_irq(this->irq, this->dev_id);
}

static int devm_irq_match(struct device *dev, void *res, void *data)
{
	struct irq_devres *this = res, *match = data;

	return this->irq == match->irq && this->dev_id == match->dev_id;
}

/**
 *	devm_request_irq - allocate an interrupt line for a managed device
 *	@dev: device to request interrupt for
 *	@irq: Interrupt line to allocate
 *	@handler: Function to be called when the IRQ occurs
 *	@irqflags: Interrupt type flags
 *	@devname: An ascii name for the claiming device
 *	@dev_id: A cookie passed back to the handler function
 *
 *	Except for the extra @dev argument, this function takes the
 *	same arguments and performs the same function as
 *	request_irq().  IRQs requested with this function will be
 *	automatically freed on driver detach.
 *
 *	If an IRQ allocated with this function needs to be freed
 *	separately, dev_free_irq() must be used.
 */
int devm_request_irq(struct device *dev, unsigned int irq,
		     irq_handler_t handler, unsigned long irqflags,
		     const char *devname, void *dev_id)
{
	struct irq_devres *dr;
	int rc;

	dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
			  GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	rc = request_irq(irq, handler, irqflags, devname, dev_id);
	if (rc) {
		devres_free(dr);
		return rc;
	}

	dr->irq = irq;
	dr->dev_id = dev_id;
	devres_add(dev, dr);

	return 0;
}
EXPORT_SYMBOL(devm_request_irq);

/**
 *	devm_free_irq - free an interrupt
 *	@dev: device to free interrupt for
 *	@irq: Interrupt line to free
 *	@dev_id: Device identity to free
 *
 *	Except for the extra @dev argument, this function takes the
 *	same arguments and performs the same function as free_irq().
 *	This function instead of free_irq() should be used to manually
 *	free IRQs allocated with dev_request_irq().
 */
void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
{
	struct irq_devres match_data = { irq, dev_id };

	free_irq(irq, dev_id);
	WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
			       &match_data));
}
EXPORT_SYMBOL(devm_free_irq);