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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.

Linux Kernel patch submission checklist
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are some basic things that developers should do if they want to see their
kernel patch submissions accepted more quickly.

These are all above and beyond the documentation that is provided in
Documentation/SubmittingPatches and elsewhere regarding submitting Linux
kernel patches.


1: Builds cleanly with applicable or modified CONFIG options =y, =m, and
   =n.  No gcc warnings/errors, no linker warnings/errors.

2: Passes allnoconfig, allmodconfig

3: Builds on multiple CPU architectures by using local cross-compile tools
   or something like PLM at OSDL.

4: ppc64 is a good architecture for cross-compilation checking because it
   tends to use `unsigned long' for 64-bit quantities.

5: Matches kernel coding style(!)

6: Any new or modified CONFIG options don't muck up the config menu.

7: All new Kconfig options have help text.

8: Has been carefully reviewed with respect to relevant Kconfig
   combinations.  This is very hard to get right with testing -- brainpower
   pays off here.

9: Check cleanly with sparse.

10: Use 'make checkstack' and 'make namespacecheck' and fix any problems
    that they find.  Note: checkstack does not point out problems explicitly,
    but any one function that uses more than 512 bytes on the stack is a
    candidate for change.

11: Include kernel-doc to document global kernel APIs.  (Not required for
    static functions, but OK there also.) Use 'make htmldocs' or 'make
    mandocs' to check the kernel-doc and fix any issues.

12: Has been tested with CONFIG_PREEMPT, CONFIG_DEBUG_PREEMPT,
    CONFIG_DEBUG_SLAB, CONFIG_DEBUG_PAGEALLOC, CONFIG_DEBUG_MUTEXES,
    CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_SPINLOCK_SLEEP all simultaneously
    enabled.

13: Has been build- and runtime tested with and without CONFIG_SMP and
    CONFIG_PREEMPT.

14: If the patch affects IO/Disk, etc: has been tested with and without
    CONFIG_LBD.

15: All codepaths have been exercised with all lockdep features enabled.

16: All new /proc entries are documented under Documentation/

17: All new kernel boot parameters are documented in
    Documentation/kernel-parameters.txt.

18: All new module parameters are documented with MODULE_PARM_DESC()

19: All new userspace interfaces are documented in Documentation/ABI/.
    See Documentation/ABI/README for more information.

20: Check that it all passes `make headers_check'.

21: Has been checked with injection of at least slab and page-allocation
    fauilures.  See Documentation/fault-injection/.

    If the new code is substantial, addition of subsystem-specific fault
    injection might be appropriate.

22: Newly-added code has been compiled with `gcc -W' (use "make
    EXTRA_CFLAGS=-W").  This will generate lots of noise, but is good for
    finding bugs like "warning: comparison between signed and unsigned".

23: Tested after it has been merged into the -mm patchset to make sure
    that it still works with all of the other queued patches and various
    changes in the VM, VFS, and other subsystems.

24: Avoid whitespace damage such as indenting with spaces or whitespace
    at the end of lines.  You can test this by feeding the patch to
    "git apply --check --whitespace=error-all"

25: Check your patch for general style as detailed in
    Documentation/CodingStyle.  Check for trivial violations with the
    patch style checker prior to submission (scripts/checkpatch.pl).
    You should be able to justify all violations that remain in
    your patch.