Bug#929929: zfs smid

[Chris Zubrzycki]

Is there any chance to keep the removed exported symbol? Could you guys 
convince the kernel team? There’s no copyright issue since it’s released code, 
it’s just keeping a symbol that has been in exported in the kernel for the past 
7 years. On top of that, Greg is violating the kernel release rules by removing 
exports/doing code cleanup in stable kernels.