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Sometimes the uverbs uAPI doesn't really care about the structure it gets from user-space. All it wants to do is to allocate enough space and send it to the hardware/provider driver. Adding a UVERBS_ATTR_MIN_SIZE that could be used for this scenarios. We use USHRT_MAX as the kernel known size to bypass any zero validations. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>