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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.

/*
  Generic support for BUG()

  This respects the following config options:

  CONFIG_BUG - emit BUG traps.  Nothing happens without this.
  CONFIG_GENERIC_BUG - enable this code.
  CONFIG_DEBUG_BUGVERBOSE - emit full file+line information for each BUG

  CONFIG_BUG and CONFIG_DEBUG_BUGVERBOSE are potentially user-settable
  (though they're generally always on).

  CONFIG_GENERIC_BUG is set by each architecture using this code.

  To use this, your architecture must:

  1. Set up the config options:
     - Enable CONFIG_GENERIC_BUG if CONFIG_BUG

  2. Implement BUG (and optionally BUG_ON, WARN, WARN_ON)
     - Define HAVE_ARCH_BUG
     - Implement BUG() to generate a faulting instruction
     - NOTE: struct bug_entry does not have "file" or "line" entries
       when CONFIG_DEBUG_BUGVERBOSE is not enabled, so you must generate
       the values accordingly.

  3. Implement the trap
     - In the illegal instruction trap handler (typically), verify
       that the fault was in kernel mode, and call report_bug()
     - report_bug() will return whether it was a false alarm, a warning,
       or an actual bug.
     - You must implement the is_valid_bugaddr(bugaddr) callback which
       returns true if the eip is a real kernel address, and it points
       to the expected BUG trap instruction.

    Jeremy Fitzhardinge <jeremy@goop.org> 2006
 */
#include <linux/list.h>
#include <linux/module.h>
#include <linux/bug.h>
#include <linux/sched.h>

extern const struct bug_entry __start___bug_table[], __stop___bug_table[];

#ifdef CONFIG_MODULES
static LIST_HEAD(module_bug_list);

static const struct bug_entry *module_find_bug(unsigned long bugaddr)
{
	struct module *mod;

	list_for_each_entry(mod, &module_bug_list, bug_list) {
		const struct bug_entry *bug = mod->bug_table;
		unsigned i;

		for (i = 0; i < mod->num_bugs; ++i, ++bug)
			if (bugaddr == bug->bug_addr)
				return bug;
	}
	return NULL;
}

int module_bug_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
			struct module *mod)
{
	char *secstrings;
	unsigned int i;

	mod->bug_table = NULL;
	mod->num_bugs = 0;

	/* Find the __bug_table section, if present */
	secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
	for (i = 1; i < hdr->e_shnum; i++) {
		if (strcmp(secstrings+sechdrs[i].sh_name, "__bug_table"))
			continue;
		mod->bug_table = (void *) sechdrs[i].sh_addr;
		mod->num_bugs = sechdrs[i].sh_size / sizeof(struct bug_entry);
		break;
	}

	/*
	 * Strictly speaking this should have a spinlock to protect against
	 * traversals, but since we only traverse on BUG()s, a spinlock
	 * could potentially lead to deadlock and thus be counter-productive.
	 */
	list_add(&mod->bug_list, &module_bug_list);

	return 0;
}

void module_bug_cleanup(struct module *mod)
{
	list_del(&mod->bug_list);
}

#else

static inline const struct bug_entry *module_find_bug(unsigned long bugaddr)
{
	return NULL;
}
#endif

const struct bug_entry *find_bug(unsigned long bugaddr)
{
	const struct bug_entry *bug;

	for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
		if (bugaddr == bug->bug_addr)
			return bug;

	return module_find_bug(bugaddr);
}

enum bug_trap_type report_bug(unsigned long bugaddr, struct pt_regs *regs)
{
	const struct bug_entry *bug;
	const char *file;
	unsigned line, warning;

	if (!is_valid_bugaddr(bugaddr))
		return BUG_TRAP_TYPE_NONE;

	bug = find_bug(bugaddr);

	printk(KERN_EMERG "------------[ cut here ]------------\n");

	file = NULL;
	line = 0;
	warning = 0;

	if (bug) {
#ifdef CONFIG_DEBUG_BUGVERBOSE
		file = bug->file;
		line = bug->line;
#endif
		warning = (bug->flags & BUGFLAG_WARNING) != 0;
	}

	if (warning) {
		/* this is a WARN_ON rather than BUG/BUG_ON */
		if (file)
			printk(KERN_ERR "Badness at %s:%u\n",
			       file, line);
		else
			printk(KERN_ERR "Badness at %p "
			       "[verbose debug info unavailable]\n",
			       (void *)bugaddr);

		show_regs(regs);
		return BUG_TRAP_TYPE_WARN;
	}

	if (file)
		printk(KERN_CRIT "kernel BUG at %s:%u!\n",
		       file, line);
	else
		printk(KERN_CRIT "Kernel BUG at %p "
		       "[verbose debug info unavailable]\n",
		       (void *)bugaddr);

	return BUG_TRAP_TYPE_BUG;
}