[PATCH v2 0/3] memblock: Remove unused exact nid allocation API

[Kaitao Cheng <kaitao.cheng@linux.dev>]

Commit ffe55393137c ("mm/sparse: remove sparse buffer pre-allocation
mechanism") removed the only memmap_alloc() caller that requested an
allocation from an exact NUMA node. All remaining callers allow fallback
to other nodes, leaving the exact_nid argument unused.

Remove the argument from memmap_alloc(). This leaves
memblock_alloc_exact_nid_raw() without any in-kernel callers, so move the
applicable exact-node allocation tests to memblock_alloc_range_nid() and
remove the unused API. Also remove the exact_nid argument from the internal
allocation helper, since all of its remaining callers allow fallback.

Exact-node allocation remains a required behavior of
memblock_alloc_range_nid(). CMA uses it when reserving per-node CMA areas;
allowing fallback could leave the area's recorded nid inconsistent with
the physical location of its memory. KHO also uses it for per-node scratch
areas that must remain on the requested node. Therefore, retain coverage
of this behavior by making the applicable NUMA tests call
memblock_alloc_range_nid() directly with exact_nid set.

The tests that exercise memblock_alloc_internal() retrying below min_addr
cannot be retained unchanged. Unlike memblock_alloc_internal(),
memblock_alloc_range_nid() treats its start address as a hard boundary and
does not retry from address zero. Remove those tests along with the now
unused TEST_F_EXACT dispatch from the shared allocation tests.

Kaitao Cheng (3):
  mm: Remove unused exact_nid parameter from memmap_alloc()
  memblock tests: Move exact nid tests to memblock_alloc_range_nid()
  memblock: Remove unused memblock_alloc_exact_nid_raw()

 include/linux/memblock.h                      |   3 -
 mm/memblock.c                                 |  44 +-
 mm/mm_init.c                                  |  14 +-
 mm/mm_init.h                                  |   4 +-
 mm/sparse-vmemmap.c                           |   2 +-
 mm/sparse.c                                   |   2 +-
 .../memblock/tests/alloc_exact_nid_api.c      | 454 ++----------------
 tools/testing/memblock/tests/alloc_nid_api.c  |  20 -
 tools/testing/memblock/tests/alloc_nid_api.h  |   1 -
 tools/testing/memblock/tests/common.h         |   2 -
 10 files changed, 50 insertions(+), 496 deletions(-)

-- 
2.54.0 (Apple Git-157)