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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 _ALPHA_THREAD_INFO_H
#define _ALPHA_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/types.h>
#include <asm/hwrpb.h>
#endif

#ifndef __ASSEMBLY__
struct thread_info {
	struct pcb_struct	pcb;		/* palcode state */

	struct task_struct	*task;		/* main task structure */
	unsigned int		flags;		/* low level flags */
	unsigned int		ieee_state;	/* see fpu.h */

	struct exec_domain	*exec_domain;	/* execution domain */
	mm_segment_t		addr_limit;	/* thread address space */
	unsigned		cpu;		/* current CPU */
	int			preempt_count; /* 0 => preemptable, <0 => BUG */

	int bpt_nsaved;
	unsigned long bpt_addr[2];		/* breakpoint handling  */
	unsigned int bpt_insn[2];

	struct restart_block	restart_block;
};

/*
 * Macros/functions for gaining access to the thread information structure.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.addr_limit	= KERNEL_DS,		\
	.restart_block = {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/* How to get the thread information struct from C.  */
register struct thread_info *__current_thread_info __asm__("$8");
#define current_thread_info()  __current_thread_info

/* Thread information allocation.  */
#define THREAD_SIZE (2*PAGE_SIZE)
#define alloc_thread_info(tsk) \
  ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)

#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x40000000

/*
 * Thread information flags:
 * - these are process state flags and used from assembly
 * - pending work-to-be-done flags come first to fit in and immediate operand.
 *
 * TIF_SYSCALL_TRACE is known to be 0 via blbs.
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_POLLING_NRFLAG	3	/* poll_idle is polling NEED_RESCHED */
#define TIF_DIE_IF_KERNEL	4	/* dik recursion lock */
#define TIF_UAC_NOPRINT		5	/* see sysinfo.h */
#define TIF_UAC_NOFIX		6
#define TIF_UAC_SIGBUS		7
#define TIF_MEMDIE		8
#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

/* Work to do on interrupt/exception return.  */
#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED)

/* Work to do on any return to userspace.  */
#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
				 | _TIF_SYSCALL_TRACE)

#define ALPHA_UAC_SHIFT		6
#define ALPHA_UAC_MASK		(1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
				 1 << TIF_UAC_SIGBUS)

#define SET_UNALIGN_CTL(task,value)	({				     \
	task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
		~ALPHA_UAC_MASK)					     \
		| (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
		| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
		| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
	0; })

#define GET_UNALIGN_CTL(task,value)	({				\
	put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
		  >> ALPHA_UAC_SHIFT					\
		 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
		 >> (ALPHA_UAC_SHIFT + 1)				\
		 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
		 >> (ALPHA_UAC_SHIFT - 1),				\
		 (int __user *)(value));				\
	})

#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */