Re: [PATCH v15 01/10] Add a function to kmap one page of a multipage bio_vec

[Christoph Hellwig]

I've now got 4 copies of this series in less than a week, or rather
partial copies as all of them seem to miss a cover letter.

Thus I still don't know how the core code in this series is tested or why
you've not considered using it for anything but your little corner and
thus barely tested.

Please slow down a bit and after the nth time please consider
testability.  Make sure core code regular exercised uses it, or find
a way to unit test it at least.