Re: [PATCH 5.11] block: optimise for_each_bvec() advance

[Christoph Hellwig]

On Tue, Nov 24, 2020 at 10:21:23AM +0000, Pavel Begunkov wrote:
> Because of how for_each_bvec() works it never advances across multiple
> entries at a time, so bvec_iter_advance() is an overkill. Add
> specialised bvec_iter_advance_single() that is faster. It also handles
> zero-len bvecs, so can kill bvec_iter_skip_zero_bvec().

bvec_iter_advance_single needs a comment describing how it can be
used.  Also can you take a look at the other callers and see who
can be switched over?  If you are not sure ask the relevant maintainers.