[LSF/MM/BPF TOPIC] Page table manipulation primitives

[Mike Rapoport <rppt@linux.ibm.com>]

While updating the architectures to properly use 5-level folded page tables
without <asm-generic/?level-fixup.h> and <asm-generic/pgtable-nop4d-hack.h>
I wondered if we can do better than explicitly name each and every level of
the page table, open-code traversal of all the layers numerous times and
have copied do_something_pXd_range().

Then I've come across Kirill's "Proof-of-concept: better(?) page-table
manipulation API" [1], but as far as I could see there was no progress
since then.

I'd like to resurrect the topic and try to see if we can come up with
actually better page table manipulation API.

[1] https://lore.kernel.org/lkml/20180424154355.mfjgkf47kdp2by4e@black.fi.intel.com/

-- 
Sincerely yours,
Mike.