> -#define bvec_iter_page(bvec, iter)                           \
> +#define mp_bvec_iter_page(bvec, iter)                                \
>       (__bvec_iter_bvec((bvec), (iter))->bv_page)
>  
> -#define bvec_iter_len(bvec, iter)                            \
> +#define mp_bvec_iter_len(bvec, iter)                         \

I'd much prefer if we would stick to the segment naming that
we also use in the higher level helper.

So segment_iter_page, segment_iter_len, etc.

> + * This helpers are for building sp bvec in flight.

Please spell out single page, sp is not easy understandable.

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