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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.

#ifndef _X86_64_PGALLOC_H
#define _X86_64_PGALLOC_H

#include <asm/pda.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <linux/quicklist.h>

#define QUICK_PGD 0	/* We preserve special mappings over free */
#define QUICK_PT 1	/* Other page table pages that are zero on free */

#define pmd_populate_kernel(mm, pmd, pte) \
		set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
#define pud_populate(mm, pud, pmd) \
		set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)))
#define pgd_populate(mm, pgd, pud) \
		set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
{
	set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
}

static inline void pmd_free(pmd_t *pmd)
{
	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
	quicklist_free(QUICK_PT, NULL, pmd);
}

static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
{
	return (pmd_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
}

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return (pud_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
}

static inline void pud_free (pud_t *pud)
{
	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
	quicklist_free(QUICK_PT, NULL, pud);
}

static inline void pgd_list_add(pgd_t *pgd)
{
	struct page *page = virt_to_page(pgd);

	spin_lock(&pgd_lock);
	list_add(&page->lru, &pgd_list);
	spin_unlock(&pgd_lock);
}

static inline void pgd_list_del(pgd_t *pgd)
{
	struct page *page = virt_to_page(pgd);

	spin_lock(&pgd_lock);
	list_del(&page->lru);
	spin_unlock(&pgd_lock);
}

static inline void pgd_ctor(void *x)
{
	unsigned boundary;
	pgd_t *pgd = x;
	struct page *page = virt_to_page(pgd);

	/*
	 * Copy kernel pointers in from init.
	 */
	boundary = pgd_index(__PAGE_OFFSET);
	memcpy(pgd + boundary,
		init_level4_pgt + boundary,
		(PTRS_PER_PGD - boundary) * sizeof(pgd_t));

	spin_lock(&pgd_lock);
	list_add(&page->lru, &pgd_list);
	spin_unlock(&pgd_lock);
}

static inline void pgd_dtor(void *x)
{
	pgd_t *pgd = x;
	struct page *page = virt_to_page(pgd);

        spin_lock(&pgd_lock);
	list_del(&page->lru);
	spin_unlock(&pgd_lock);
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd = (pgd_t *)quicklist_alloc(QUICK_PGD,
		GFP_KERNEL|__GFP_REPEAT, pgd_ctor);
	return pgd;
}

static inline void pgd_free(pgd_t *pgd)
{
	BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
	quicklist_free(QUICK_PGD, pgd_dtor, pgd);
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
	return (pte_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
}

static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
	void *p = (void *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);

	if (!p)
		return NULL;
	return virt_to_page(p);
}

/* Should really implement gc for free page table pages. This could be
   done with a reference count in struct page. */

static inline void pte_free_kernel(pte_t *pte)
{
	BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
	quicklist_free(QUICK_PT, NULL, pte);
}

static inline void pte_free(struct page *pte)
{
	quicklist_free_page(QUICK_PT, NULL, pte);
}

#define __pte_free_tlb(tlb,pte) quicklist_free_page(QUICK_PT, NULL,(pte))

#define __pmd_free_tlb(tlb,x)   quicklist_free(QUICK_PT, NULL, (x))
#define __pud_free_tlb(tlb,x)   quicklist_free(QUICK_PT, NULL, (x))

static inline void check_pgt_cache(void)
{
	quicklist_trim(QUICK_PGD, pgd_dtor, 25, 16);
	quicklist_trim(QUICK_PT, NULL, 25, 16);
}
#endif /* _X86_64_PGALLOC_H */