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From: Muchun Song In-Reply-To: <20260708-bootmem_info_part2-v1-2-156ce4986598@kernel.org> Date: Thu, 9 Jul 2026 14:19:22 +0800 Cc: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Oscar Salvador , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org Content-Transfer-Encoding: 7bit Message-Id: <9667F817-DFD9-460B-B7AA-C9F551190F2E@linux.dev> References: <20260708-bootmem_info_part2-v1-0-156ce4986598@kernel.org> <20260708-bootmem_info_part2-v1-2-156ce4986598@kernel.org> To: "David Hildenbrand (Arm)" X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E37E41C0009 X-Stat-Signature: r1mfty7t3cxw4g67z9uexrra7zbi3siw X-HE-Tag: 1783578005-633838 X-HE-Meta: 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 HPb3Jdh3 CQPgxfFS7zrs03tDkxz2pICx85zMNPgljsBr7F8b/lbtDTgpuqClP2/qs0W/bw/OHS4UCVTDUg+Zh+JKRJPt+SMoLYVBDgdmOZvk/CC2Y4pSvwiW6UG7QIHXUsmOsGshQ9awRDyX70T2iAEob+9h/YULE9dgjH1vRrVkXt+/KZW48Vg7TnMtJz4Nun1hF6hFEJmGSDtjlpQBLtQ5YxDqUj7l6lIJO0orF2uQi5Yec7mCUxrGO7aRzSErGoEYirvVUeJq2CFYaeJsWAosjpN97O1xAmkXMpIuQhSF+4xbQo5cJbZxJUSvlIXVjSA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > On Jul 8, 2026, at 22:10, David Hildenbrand (Arm) wrote: > > 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(). Add some kerneldoc. Use a single > adjust_managed_page_count() call. > > Signed-off-by: David Hildenbrand (Arm) Reviewed-by: Muchun Song Thanks.