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AndroidSystemSEPolicy

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    Jason Gunthorpe authored and Alex Williamson committed
    Many of the mdev drivers use a simple counter for keeping track of the
    available instances. Move this code to the core code and store the counter
    in the mdev_parent. Implement it using correct locking, fixing mdpy.
    
    Drivers just provide the value in the mdev_driver at registration time
    and the core code takes care of maintaining it and exposing the value in
    sysfs.
    
    [hch: count instances per-parent instead of per-type, use an atomic_t
     to avoid taking mdev_list_lock in the show method]
    
    Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
    Reviewed-by: default avatarKirti Wankhede <kwankhede@nvidia.com>
    Reviewed-by: default avatarEric Farman <farman@linux.ibm.com>
    Link: https://lore.kernel.org/r/20220923092652.100656-15-hch@lst.de
    
    
    Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
    9c799c22
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