[PATCH 01/23] block: factor out a bvec_set_page helper

[Matthew Wilcox]

On Mon, Jan 30, 2023 at 08:47:58PM -0800, Jakub Kicinski wrote:
> kinda random thought but since we're touching this area - could we
> perhaps move the definition of struct bio_vec and trivial helpers 
> like this into a new header? bvec.h pulls in mm.h which is a right
> behemoth :S

I bet we can drop mm.h now.  It was originally added for nth_page()
in 3d75ca0adef4 but those were all removed by b8753433fc61.

A quick smoke test on my default testing config doesn't find any
problems.  Let me send a patch and see if the build bots complain.