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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.

/*
 * Non Fatal Machine Check Exception Reporting
 *
 * (C) Copyright 2002 Dave Jones. <davej@codemonkey.org.uk>
 *
 * This file contains routines to check for non-fatal MCEs every 15s
 *
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/module.h>

#include <asm/processor.h> 
#include <asm/system.h>
#include <asm/msr.h>

#include "mce.h"

static int firstbank;

#define MCE_RATE	15*HZ	/* timer rate is 15s */

static void mce_checkregs (void *info)
{
	u32 low, high;
	int i;

	for (i=firstbank; i<nr_mce_banks; i++) {
		rdmsr (MSR_IA32_MC0_STATUS+i*4, low, high);

		if (high & (1<<31)) {
			printk(KERN_INFO "MCE: The hardware reports a non "
				"fatal, correctable incident occurred on "
				"CPU %d.\n",
				smp_processor_id());
			printk (KERN_INFO "Bank %d: %08x%08x\n", i, high, low);

			/* Scrub the error so we don't pick it up in MCE_RATE seconds time. */
			wrmsr (MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);

			/* Serialize */
			wmb();
			add_taint(TAINT_MACHINE_CHECK);
		}
	}
}

static void mce_work_fn(struct work_struct *work);
static DECLARE_DELAYED_WORK(mce_work, mce_work_fn);

static void mce_work_fn(struct work_struct *work)
{ 
	on_each_cpu(mce_checkregs, NULL, 1, 1);
	schedule_delayed_work(&mce_work, round_jiffies_relative(MCE_RATE));
} 

static int __init init_nonfatal_mce_checker(void)
{
	struct cpuinfo_x86 *c = &boot_cpu_data;

	/* Check for MCE support */
	if (!cpu_has(c, X86_FEATURE_MCE))
		return -ENODEV;

	/* Check for PPro style MCA */
	if (!cpu_has(c, X86_FEATURE_MCA))
		return -ENODEV;

	/* Some Athlons misbehave when we frob bank 0 */
	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
		boot_cpu_data.x86 == 6)
			firstbank = 1;
	else
			firstbank = 0;

	/*
	 * Check for non-fatal errors every MCE_RATE s
	 */
	schedule_delayed_work(&mce_work, round_jiffies_relative(MCE_RATE));
	printk(KERN_INFO "Machine check exception polling timer started.\n");
	return 0;
}
module_init(init_nonfatal_mce_checker);

MODULE_LICENSE("GPL");