> It is has to be saved either at the low level driver's mr object,
 > e.g. struct mlx4_ib_mr, or at a common place like struct ib_umem. Do
 > you prefer that it will be saved in struct mlx4_ib_mr?

I don't see why it has to be saved anywhere?  The only place you use
umem->address is in handle_hugetlb_usermr(), and you could just as
easily pass in start directly as a parameter (since
mlx4_ib_reg_user_mr() has that value in a parameter anyway).

 - R.
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