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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 _ASM_POWERPC_TLBFLUSH_H
#define _ASM_POWERPC_TLBFLUSH_H
/*
 * TLB flushing:
 *
 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
 *  - flush_tlb_page(vma, vmaddr) flushes one page
 *  - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
 *  - flush_tlb_range(vma, start, end) flushes a range of pages
 *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
 *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */
#ifdef __KERNEL__

struct mm_struct;
struct vm_area_struct;

#if defined(CONFIG_4xx) || defined(CONFIG_8xx) || defined(CONFIG_FSL_BOOKE)
/*
 * TLB flushing for software loaded TLB chips
 *
 * TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
 * flush_tlb_kernel_range are best implemented as tlbia vs
 * specific tlbie's
 */

extern void _tlbie(unsigned long address);

#if defined(CONFIG_40x) || defined(CONFIG_8xx)
#define _tlbia()	asm volatile ("tlbia; sync" : : : "memory")
#else /* CONFIG_44x || CONFIG_FSL_BOOKE */
extern void _tlbia(void);
#endif

static inline void flush_tlb_mm(struct mm_struct *mm)
{
	_tlbia();
}

static inline void flush_tlb_page(struct vm_area_struct *vma,
				  unsigned long vmaddr)
{
	_tlbie(vmaddr);
}

static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
					 unsigned long vmaddr)
{
	_tlbie(vmaddr);
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
	_tlbia();
}

static inline void flush_tlb_kernel_range(unsigned long start,
					  unsigned long end)
{
	_tlbia();
}

#elif defined(CONFIG_PPC32)
/*
 * TLB flushing for "classic" hash-MMMU 32-bit CPUs, 6xx, 7xx, 7xxx
 */
extern void _tlbie(unsigned long address);
extern void _tlbia(void);

extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
extern void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
			    unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);

#else
/*
 * TLB flushing for 64-bit has-MMU CPUs
 */

#include <linux/percpu.h>
#include <asm/page.h>

#define PPC64_TLB_BATCH_NR 192

struct ppc64_tlb_batch {
	int			active;
	unsigned long		index;
	struct mm_struct	*mm;
	real_pte_t		pte[PPC64_TLB_BATCH_NR];
	unsigned long		vaddr[PPC64_TLB_BATCH_NR];
	unsigned int		psize;
};
DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);

extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);

extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
			    pte_t *ptep, unsigned long pte, int huge);

#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE

static inline void arch_enter_lazy_mmu_mode(void)
{
	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);

	batch->active = 1;
}

static inline void arch_leave_lazy_mmu_mode(void)
{
	struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);

	if (batch->index)
		__flush_tlb_pending(batch);
	batch->active = 0;
}

#define arch_flush_lazy_mmu_mode()      do {} while (0)


extern void flush_hash_page(unsigned long va, real_pte_t pte, int psize,
			    int local);
extern void flush_hash_range(unsigned long number, int local);


static inline void flush_tlb_mm(struct mm_struct *mm)
{
}

static inline void flush_tlb_page(struct vm_area_struct *vma,
				  unsigned long vmaddr)
{
}

static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
					 unsigned long vmaddr)
{
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
				   unsigned long start, unsigned long end)
{
}

static inline void flush_tlb_kernel_range(unsigned long start,
					  unsigned long end)
{
}

/* Private function for use by PCI IO mapping code */
extern void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
				     unsigned long end);


#endif

/*
 * This gets called at the end of handling a page fault, when
 * the kernel has put a new PTE into the page table for the process.
 * We use it to ensure coherency between the i-cache and d-cache
 * for the page which has just been mapped in.
 * On machines which use an MMU hash table, we use this to put a
 * corresponding HPTE into the hash table ahead of time, instead of
 * waiting for the inevitable extra hash-table miss exception.
 */
extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);

/*
 * This is called in munmap when we have freed up some page-table
 * pages.  We don't need to do anything here, there's nothing special
 * about our page-table pages.  -- paulus
 */
static inline void flush_tlb_pgtables(struct mm_struct *mm,
				      unsigned long start, unsigned long end)
{
}

#endif /*__KERNEL__ */
#endif /* _ASM_POWERPC_TLBFLUSH_H */