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d79db3f396
Let's extend free_reserved_page() in page_alloc.c to free_reserved_pages(), dropping the custom x86 variant. The common-code variant will consume an order, so adjust the x86 callers accordingly. Make free_reserved_pages() assume that we are freeing ordinary high-order pages, just with the special "reserved" flavor. The target use case for now is freeing vmemmap PMD pages. Set the refcount directly to 0 (instead of 1) and call __free_frozen_pages(). Set the page count to 0 before clearing PG_reserved, so someone checking PG_reserved (and not finding it set) to then try grabbing a ref would not suddenly have that ref be dropped. That is arguably cleaner and safer than the old way of doing it. Add some kerneldoc. Use a single adjust_managed_page_count() call. Link: https://lore.kernel.org/20260716-bootmem_info_part2-v2-2-4afc76c73d61@kernel.org Signed-off-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: Muchun Song <muchun.song@linux.dev> Reviewed-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Brendan Jackman <jackmanb@google.com> Cc: Brendan Jackman <brendan.jackman@linux.dev> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Liam R. Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>