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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 __ASMARM_ELF_H
#define __ASMARM_ELF_H

#include <asm/hwcap.h>

#ifndef __ASSEMBLY__
/*
 * ELF register definitions..
 */
#include <asm/ptrace.h>
#include <asm/user.h>

typedef unsigned long elf_greg_t;
typedef unsigned long elf_freg_t[3];

#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

typedef struct user_fp elf_fpregset_t;
#endif

#define EM_ARM	40
#define EF_ARM_APCS26 0x08
#define EF_ARM_SOFT_FLOAT 0x200
#define EF_ARM_EABI_MASK 0xFF000000

#define R_ARM_NONE	0
#define R_ARM_PC24	1
#define R_ARM_ABS32	2
#define R_ARM_CALL	28
#define R_ARM_JUMP24	29

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS	ELFCLASS32
#ifdef __ARMEB__
#define ELF_DATA	ELFDATA2MSB
#else
#define ELF_DATA	ELFDATA2LSB
#endif
#define ELF_ARCH	EM_ARM

#ifdef __KERNEL__
#ifndef __ASSEMBLY__
/*
 * This yields a string that ld.so will use to load implementation
 * specific libraries for optimization.  This is more specific in
 * intent than poking at uname or /proc/cpuinfo.
 *
 * For now we just provide a fairly general string that describes the
 * processor family.  This could be made more specific later if someone
 * implemented optimisations that require it.  26-bit CPUs give you
 * "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
 * supported).  32-bit CPUs give you "v3[lb]" for anything based on an
 * ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
 * core.
 */
#define ELF_PLATFORM_SIZE 8
#define ELF_PLATFORM	(elf_platform)

extern char elf_platform[];
#endif

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) ((x)->e_machine == EM_ARM && ELF_PROC_OK(x))

/*
 * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
 */
#define ELF_PROC_OK(x)	(ELF_THUMB_OK(x) && ELF_26BIT_OK(x))

#define ELF_THUMB_OK(x) \
	((elf_hwcap & HWCAP_THUMB && ((x)->e_entry & 1) == 1) || \
	 ((x)->e_entry & 3) == 0)

#define ELF_26BIT_OK(x) \
	((elf_hwcap & HWCAP_26BIT && (x)->e_flags & EF_ARM_APCS26) || \
	  ((x)->e_flags & EF_ARM_APCS26) == 0)

#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE	4096

/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
   use of this is to invoke "./ld.so someprog" to test out a new version of
   the loader.  We need to make sure that it is out of the way of the program
   that it will "exec", and that there is sufficient room for the brk.  */

#define ELF_ET_DYN_BASE	(2 * TASK_SIZE / 3)

/* When the program starts, a1 contains a pointer to a function to be 
   registered with atexit, as per the SVR4 ABI.  A value of 0 means we 
   have no such handler.  */
#define ELF_PLAT_INIT(_r, load_addr)	(_r)->ARM_r0 = 0

/*
 * Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
 * and CP1, we only enable access to the iWMMXt coprocessor if the
 * binary is EABI or softfloat (and thus, guaranteed not to use
 * FPA instructions.)
 */
#define SET_PERSONALITY(ex, ibcs2)					\
	do {								\
		if ((ex).e_flags & EF_ARM_APCS26) {			\
			set_personality(PER_LINUX);			\
		} else {						\
			set_personality(PER_LINUX_32BIT);		\
			if (elf_hwcap & HWCAP_IWMMXT && (ex).e_flags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) \
				set_thread_flag(TIF_USING_IWMMXT);	\
			else						\
				clear_thread_flag(TIF_USING_IWMMXT);	\
		}							\
	} while (0)

#endif

#endif