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Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes. By using this flag, the parse automatically allocates and copies the user-space data. This data is accessible by using uverbs_attr_get_len and uverbs_attr_get_alloced_ptr inline accessor functions from the handler. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>