Re: [PATCH 0/2] memblock: Remove unused exact nid allocation API

[Mike Rapoport <rppt@kernel.org>]

On Thu, Sep 17, 2026 at 04:15:02PM +0800, Kaitao Cheng wrote:
> This series follows the removal of the unused exact_nid argument from
> memmap_alloc(). That change removed the last in-kernel caller of
> memblock_alloc_exact_nid_raw(), leaving only the memblock simulator
> tests using the function.

Please resend the patch that removed exact_nid from memmap_alloc() and
these patches as a single set.
 
> The first patch moves the applicable exact-node allocation tests to
> memblock_alloc_range_nid(). The second patch removes
> memblock_alloc_exact_nid_raw() and drops the exact_nid argument from
> memblock_alloc_internal(), as all of its remaining callers allow
> fallback to other NUMA nodes.
> 
> The investigation cannot be extended to removing the exact_nid argument
> from memblock_alloc_range_nid(). CMA passes true when reserving per-node
> CMA areas. Allowing such an allocation to fall back to another node
> could leave the CMA area's recorded nid inconsistent with the physical
> location of its memory. KHO also passes true when allocating per-node
> scratch areas and requires those allocations to remain on the requested
> node.
> 
> Since exact-node allocation remains a required behavior of
> memblock_alloc_range_nid(), deleting all of the tests in
> alloc_exact_nid_api.c would remove useful coverage. Preserve the
> applicable NUMA tests by making them call memblock_alloc_range_nid()
> directly with exact_nid set.
> 
> Some tests cannot be preserved unchanged because they exercise
> memblock_alloc_internal() retrying below min_addr. 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 together with the now-unused TEST_F_EXACT dispatch from the
> shared allocation tests.
> 
> Kaitao Cheng (2):
>   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 +-
>  .../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 -
>  6 files changed, 42 insertions(+), 482 deletions(-)
> 
> -- 
> 2.54.0 (Apple Git-157)
> 

-- 
Sincerely yours,
Mike.