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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 S390_CMB_H
#define S390_CMB_H
/**
 * struct cmbdata -- channel measurement block data for user space
 *
 * @size:	size of the stored data
 * @ssch_rsch_count: XXX
 * @sample_count:
 * @device_connect_time:
 * @function_pending_time:
 * @device_disconnect_time:
 * @control_unit_queuing_time:
 * @device_active_only_time:
 * @device_busy_time:
 * @initial_command_response_time:
 *
 * all values are stored as 64 bit for simplicity, especially
 * in 32 bit emulation mode. All time values are normalized to
 * nanoseconds.
 * Currently, two formats are known, which differ by the size of
 * this structure, i.e. the last two members are only set when
 * the extended channel measurement facility (first shipped in
 * z990 machines) is activated.
 * Potentially, more fields could be added, which results in a
 * new ioctl number.
 **/
struct cmbdata {
	__u64 size;
	__u64 elapsed_time;
 /* basic and exended format: */
	__u64 ssch_rsch_count;
	__u64 sample_count;
	__u64 device_connect_time;
	__u64 function_pending_time;
	__u64 device_disconnect_time;
	__u64 control_unit_queuing_time;
	__u64 device_active_only_time;
 /* extended format only: */
	__u64 device_busy_time;
	__u64 initial_command_response_time;
};

/* enable channel measurement */
#define BIODASDCMFENABLE	_IO(DASD_IOCTL_LETTER,32)
/* enable channel measurement */
#define BIODASDCMFDISABLE	_IO(DASD_IOCTL_LETTER,33)
/* read channel measurement data */
#define BIODASDREADALLCMB	_IOWR(DASD_IOCTL_LETTER,33,struct cmbdata)

#ifdef __KERNEL__
struct ccw_device;
/**
 * enable_cmf() - switch on the channel measurement for a specific device
 *  @cdev:	The ccw device to be enabled
 *  returns 0 for success or a negative error value.
 *
 *  Context:
 *    non-atomic
 **/
extern int enable_cmf(struct ccw_device *cdev);

/**
 * disable_cmf() - switch off the channel measurement for a specific device
 *  @cdev:	The ccw device to be disabled
 *  returns 0 for success or a negative error value.
 *
 *  Context:
 *    non-atomic
 **/
extern int disable_cmf(struct ccw_device *cdev);

/**
 * cmf_read() - read one value from the current channel measurement block
 * @cmf:	the channel to be read
 * @index:	the name of the value that is read
 *
 *  Context:
 *    any
 **/

extern u64 cmf_read(struct ccw_device *cdev, int index);
/**
 * cmf_readall() - read one value from the current channel measurement block
 * @cmf:	the channel to be read
 * @data:	a pointer to a data block that will be filled
 *
 *  Context:
 *    any
 **/
extern int cmf_readall(struct ccw_device *cdev, struct cmbdata*data);

#endif /* __KERNEL__ */
#endif /* S390_CMB_H */