[PATCH v3 0/4] x86/mm: some cleanups for pagetable setup code

[Brendan Jackman]

Per discussion in [0] I'm looking for ways to refactor this code to make
ASI easier to deal with. But, while looking, I found some little things
that seem like just straightforward cleanups without any real
refactoring needed. So let's start there.

This applies to tip/master.

I'm having some infra issues so this hasn't been through Sashiko review
yet. I've tested it on QEMU. 

[0] https://lore.kernel.org/all/20250924-b4-asi-page-alloc-v1-0-2d861768041f@xxxxxxxxxx/T/#t

Signed-off-by: Brendan Jackman <jackmanb@xxxxxxxxxx>
---
Changes in v3:
- Rebased, added trailers.
- Tweaked commit messages / comments.
- Cleaned up paddr_last assignment.
- Added trivial split_mem_range() patch.
- Link to v2: https://lore.kernel.org/r/20260503-x86-init-cleanup-v2-0-bb690bd2477c@xxxxxxxxxx

Changes in v2:
- Simplified patchset, instead of trying to fix confusing code only to
  delete it in a subsequent patch, just delete it in the first place.
- Fixed add_pfn_range_mapped() args. (This bug causes a KASAN build to
  crash during boot).
- Link to v1: https://lore.kernel.org/r/20251003-x86-init-cleanup-v1-0-f2b7994c2ad6@xxxxxxxxxx

---
Brendan Jackman (4):
      x86/mm: drop unused return from init_memory_mapping()
      x86/mm: simplify calculation of max_pfn_mapped
      x86/mm: drop unused returns from direct map setup functions
      x86/mm: delete unnecessary arg from split_mem_range()

 arch/x86/include/asm/pgtable.h |  3 +-
 arch/x86/mm/init.c             | 23 +++++-----
 arch/x86/mm/init_32.c          |  5 +--
 arch/x86/mm/init_64.c          | 96 +++++++++++++++---------------------------
 arch/x86/mm/mm_internal.h      | 11 ++---
 5 files changed, 51 insertions(+), 87 deletions(-)
---
base-commit: d74eecbb5ded9fe16e36ee49b00a74e3a81d042b
change-id: 20251003-x86-init-cleanup-0ad754910bac

Best regards,
--  
Brendan Jackman <jackmanb@xxxxxxxxxx>