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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: timer.c,v 1.3.6.1 2001/09/23 22:24:59 kai Exp $
 *
 * Copyright (C) 1996  SpellCaster Telecommunications Inc.
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * For more information, please contact gpl-info@spellcast.com or write:
 *
 *     SpellCaster Telecommunications Inc.
 *     5621 Finch Avenue East, Unit #3
 *     Scarborough, Ontario  Canada
 *     M1B 2T9
 *     +1 (416) 297-8565
 *     +1 (416) 297-6433 Facsimile
 */

#include "includes.h"
#include "hardware.h"
#include "message.h"
#include "card.h"


/*
 * Write the proper values into the I/O ports following a reset
 */
static void setup_ports(int card)
{

	outb((sc_adapter[card]->rambase >> 12), sc_adapter[card]->ioport[EXP_BASE]);

	/* And the IRQ */
	outb((sc_adapter[card]->interrupt | 0x80),
		sc_adapter[card]->ioport[IRQ_SELECT]);
}

/*
 * Timed function to check the status of a previous reset
 * Must be very fast as this function runs in the context of
 * an interrupt handler.
 *
 * Setup the ioports for the board that were cleared by the reset.
 * Then, check to see if the signate has been set. Next, set the
 * signature to a known value and issue a startproc if needed.
 */
void sc_check_reset(unsigned long data)
{
	unsigned long flags;
	unsigned long sig;
	int card = (unsigned int) data;

	pr_debug("%s: check_timer timer called\n",
		sc_adapter[card]->devicename);

	/* Setup the io ports */
	setup_ports(card);

	spin_lock_irqsave(&sc_adapter[card]->lock, flags);
	outb(sc_adapter[card]->ioport[sc_adapter[card]->shmem_pgport],
		(sc_adapter[card]->shmem_magic>>14) | 0x80);
	sig = (unsigned long) *((unsigned long *)(sc_adapter[card]->rambase + SIG_OFFSET));

	/* check the signature */
	if(sig == SIGNATURE) {
		flushreadfifo(card);
		spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
		/* See if we need to do a startproc */
		if (sc_adapter[card]->StartOnReset)
			startproc(card);
	} else  {
		pr_debug("%s: No signature yet, waiting another %lu jiffies.\n",
			sc_adapter[card]->devicename, CHECKRESET_TIME);
		mod_timer(&sc_adapter[card]->reset_timer, jiffies+CHECKRESET_TIME);
		spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);
	}
}

/*
 * Timed function to check the status of a previous reset
 * Must be very fast as this function runs in the context of
 * an interrupt handler.
 *
 * Send check sc_adapter->phystat to see if the channels are up
 * If they are, tell ISDN4Linux that the board is up. If not,
 * tell IADN4Linux that it is up. Always reset the timer to
 * fire again (endless loop).
 */
void check_phystat(unsigned long data)
{
	unsigned long flags;
	int card = (unsigned int) data;

	pr_debug("%s: Checking status...\n", sc_adapter[card]->devicename);
	/* 
	 * check the results of the last PhyStat and change only if
	 * has changed drastically
	 */
	if (sc_adapter[card]->nphystat && !sc_adapter[card]->phystat) {   /* All is well */
		pr_debug("PhyStat transition to RUN\n");
		pr_info("%s: Switch contacted, transmitter enabled\n", 
			sc_adapter[card]->devicename);
		indicate_status(card, ISDN_STAT_RUN, 0, NULL);
	}
	else if (!sc_adapter[card]->nphystat && sc_adapter[card]->phystat) {   /* All is not well */
		pr_debug("PhyStat transition to STOP\n");
		pr_info("%s: Switch connection lost, transmitter disabled\n", 
			sc_adapter[card]->devicename);

		indicate_status(card, ISDN_STAT_STOP, 0, NULL);
	}

	sc_adapter[card]->phystat = sc_adapter[card]->nphystat;

	/* Reinitialize the timer */
	spin_lock_irqsave(&sc_adapter[card]->lock, flags);
	mod_timer(&sc_adapter[card]->stat_timer, jiffies+CHECKSTAT_TIME);
	spin_unlock_irqrestore(&sc_adapter[card]->lock, flags);

	/* Send a new cePhyStatus message */
	sendmessage(card, CEPID,ceReqTypePhy,ceReqClass2,
		ceReqPhyStatus,0,0,NULL);
}