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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 _PARISC_BUG_H
#define _PARISC_BUG_H

/*
 * Tell the user there is some problem.
 * The offending file and line are encoded in the __bug_table section.
 */

#ifdef CONFIG_BUG
#define HAVE_ARCH_BUG
#define HAVE_ARCH_WARN_ON

/* the break instruction is used as BUG() marker.  */
#define	PARISC_BUG_BREAK_ASM	"break 0x1f, 0x1fff"
#define	PARISC_BUG_BREAK_INSN	0x03ffe01f  /* PARISC_BUG_BREAK_ASM */

#if defined(CONFIG_64BIT)
#define ASM_WORD_INSN		".dword\t"
#else
#define ASM_WORD_INSN		".word\t"
#endif

#ifdef CONFIG_DEBUG_BUGVERBOSE
#define BUG()								\
	do {								\
		asm volatile("\n"					\
			     "1:\t" PARISC_BUG_BREAK_ASM "\n"		\
			     "\t.pushsection __bug_table,\"a\"\n"	\
			     "2:\t" ASM_WORD_INSN "1b, %c0\n"		\
			     "\t.short %c1, %c2\n"			\
			     "\t.org 2b+%c3\n"				\
			     "\t.popsection"				\
			     : : "i" (__FILE__), "i" (__LINE__),	\
			     "i" (0), "i" (sizeof(struct bug_entry)) ); \
		for(;;) ;						\
	} while(0)

#else
#define BUG()								\
	do {								\
		asm volatile(PARISC_BUG_BREAK_ASM : : );		\
		for(;;) ;						\
	} while(0)
#endif

#ifdef CONFIG_DEBUG_BUGVERBOSE
#define __WARN()							\
	do {								\
		asm volatile("\n"					\
			     "1:\t" PARISC_BUG_BREAK_ASM "\n"		\
			     "\t.pushsection __bug_table,\"a\"\n"	\
			     "2:\t" ASM_WORD_INSN "1b, %c0\n"		\
			     "\t.short %c1, %c2\n"			\
			     "\t.org 2b+%c3\n"				\
			     "\t.popsection"				\
			     : : "i" (__FILE__), "i" (__LINE__),	\
			     "i" (BUGFLAG_WARNING),			\
			     "i" (sizeof(struct bug_entry)) );		\
	} while(0)
#else
#define __WARN()							\
	do {								\
		asm volatile("\n"					\
			     "1:\t" PARISC_BUG_BREAK_ASM "\n"		\
			     "\t.pushsection __bug_table,\"a\"\n"	\
			     "2:\t" ASM_WORD_INSN "1b\n"		\
			     "\t.short %c0\n"				\
			     "\t.org 2b+%c1\n"				\
			     "\t.popsection"				\
			     : : "i" (BUGFLAG_WARNING),			\
			     "i" (sizeof(struct bug_entry)) );		\
	} while(0)
#endif


#define WARN_ON(x) ({						\
	int __ret_warn_on = !!(x);				\
	if (__builtin_constant_p(__ret_warn_on)) {		\
		if (__ret_warn_on)				\
			__WARN();				\
	} else {						\
		if (unlikely(__ret_warn_on))			\
			__WARN();				\
	}							\
	unlikely(__ret_warn_on);				\
})

#endif

#include <asm-generic/bug.h>
#endif