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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_PARISC_THREAD_INFO_H
#define _ASM_PARISC_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/processor.h>

struct thread_info {
	struct task_struct *task;	/* main task structure */
	struct exec_domain *exec_domain;/* execution domain */
	unsigned long flags;		/* thread_info flags (see TIF_*) */
	mm_segment_t addr_limit;	/* user-level address space limit */
	__u32 cpu;			/* current CPU */
	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
	struct restart_block restart_block;
};

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.addr_limit	= KERNEL_DS,		\
	.preempt_count	= 1,			\
  	.restart_block	= {			\
		.fn = do_no_restart_syscall	\
	}					\
}

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

/* thread information allocation */

#define THREAD_ORDER            2
/* Be sure to hunt all references to this down when you change the size of
 * the kernel stack */
#define THREAD_SIZE             (PAGE_SIZE << THREAD_ORDER)
#define THREAD_SHIFT            (PAGE_SHIFT + THREAD_ORDER)

#define alloc_thread_info(tsk) ((struct thread_info *) \
			__get_free_pages(GFP_KERNEL, THREAD_ORDER))
#define free_thread_info(ti)    free_pages((unsigned long) (ti), THREAD_ORDER)

/* how to get the thread information struct from C */
#define current_thread_info()	((struct thread_info *)mfctl(30))

#endif /* !__ASSEMBLY */

#define PREEMPT_ACTIVE_BIT	28
#define PREEMPT_ACTIVE		(1 << PREEMPT_ACTIVE_BIT)

/*
 * thread information flags
 */
#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	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_32BIT               4       /* 32 bit binary */
#define TIF_MEMDIE		5
#define TIF_RESTORE_SIGMASK	6	/* restore saved signal mask */

#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_32BIT		(1 << TIF_32BIT)
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)

#define _TIF_USER_WORK_MASK     (_TIF_SIGPENDING | \
                                 _TIF_NEED_RESCHED | _TIF_RESTORE_SIGMASK)

#endif /* __KERNEL__ */

#endif /* _ASM_PARISC_THREAD_INFO_H */