Merge branch 'minor-cleanups-to-skb-frag-ref-unref'

Mina Almasry says:

====================
Minor cleanups to skb frag ref/unref (part)

This series is largely motivated by a recent discussion where there was
some confusion on how to properly ref/unref pp pages vs non pp pages:

https://lore.kernel.org/netdev/CAHS8izOoO-EovwMwAm9tLYetwikNPxC0FKyVGu1TPJWSz4bGoA@mail.gmail.com/T/#t

There is some subtely there because pp uses page->pp_ref_count for
refcounting, while non-pp uses get_page()/put_page() for ref counting.
Getting the refcounting pairs wrong can lead to kernel crash.
[...]

https://lore.kernel.org/lkml/CAHS8izN436pn3SndrzsCyhmqvJHLyxgCeDpWXA4r1ANt3RCDLQ@mail.gmail.com/T/
====================

Link: https://lore.kernel.org/r/20240408153000.2152844-1-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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