Re: [PATCH v2 3/7] block: refactor iov_count_pages() from bio_{copy,map}_user_iov()

[Christoph Hellwig]

mm/iov_iter.c already has a iov_iter_npages, although that
one doesn't do an alignment check yet.  But it might be worth
to just the iov_iter_alignment similar to how iov_iter_alignment
does it instead of this new function.
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