I spent some time to review the folio code and the existing page allocation code (alloc_pages(), __free_pages(), put_page(), release_pages(), ...).

Address @bz comments.

@bz: Is there something I should do to document the breakage?

Add diff context. No other changes.

Add diff context. No other changes.

Update patch with diff context.

In D48751#1112293, @imp wrote:

Also, please do *NOT* commit this (or any other) with *WHY* as the subject line of the commit message. each commit should have a single line at the top that describes the whole commit.
This is true for the whole series. Also I think I saw a *HOW* heading, that should be omitted as well and the context should make it clear to match our usual practice.

It is a breaking change. I grepped freebsd-src and the only format strings that happen to have this %pV sequence are drivers that come from Linux and have a struct va_format argument (though this code may not be connected to the build).

After three days of using it, I didn’t see any regressions.

I compiled-tested all supported drm-kmod branches and that was fine. Thank you!

I just built a kernel with this patch and will use it starting from tomorrow.