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Muchun Song 7e25033415 mm/hugetlb_cma: validate hugetlb CMA range by zone at reserve time ...

Hugetlb CMA allocation currently has to cope with CMA areas that span
multiple zones.

Validate the reserved CMA range up front in hugetlb_cma_reserve() so later
hugetlb CMA allocations can assume a zone-consistent area.

Also drop the pfn_valid() check from cma_validate_zones().  mem_section is
not fully initialized at this point, so the check can trigger false
warnings.  Keep the sanity check in cma_activate_area() instead.

Link: https://lore.kernel.org/20260612035903.2468601-13-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Oscar Salvador (SUSE) <osalvador@suse.de>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Frank van der Linden <fvdl@google.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador (SUSE) <osalvador@kernel.org>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

2026-07-28 21:11:59 -07:00

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