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Tue, 28 Apr 2026 01:19:03 -0700 (PDT) From: Muchun Song To: Andrew Morton , David Hildenbrand , Muchun Song , Oscar Salvador , Michael Ellerman , Madhavan Srinivasan Cc: Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nicholas Piggin , Christophe Leroy , aneesh.kumar@linux.ibm.com, joao.m.martins@oracle.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Muchun Song Subject: [PATCH v8 0/6] mm: Fix vmemmap optimization accounting and initialization Date: Tue, 28 Apr 2026 16:18:49 +0800 Message-Id: <20260428081855.1249045-1-songmuchun@bytedance.com> X-Mailer: git-send-email 2.20.1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The series fixes several bugs in vmemmap optimization, mainly around incorrect page accounting and memmap initialization in DAX and memory hotplug paths. It also fixes pageblock migratetype initialization and struct page initialization for ZONE_DEVICE compound pages. Patches 1-4 fix vmemmap accounting issues. Patch 1 fixes an accounting underflow in the section activation failure path by moving vmemmap page accounting into the lower-level allocation and freeing helpers. Patch 2 fixes incorrect altmap passing in the memory hotplug error path. Patch 3 passes pgmap through memory deactivation paths so the teardown side can determine whether vmemmap optimization was in effect. Patch 4 uses that information to account the optimized DAX vmemmap size correctly. Patches 5-6 fix initialization issues in mm/mm_init. One makes sure all pageblocks in ZONE_DEVICE compound pages get their migratetype initialized. The other fixes a case where DAX memory hotplug reuses an unoptimized early-section memmap while compound_nr_pages() still assumes vmemmap optimization, leaving tail struct pages uninitialized. Changes in v8: - In patch 4, move VM_WARN_ON_ONCE(nr_pages > PAGES_PER_SECTION) to the top of section_nr_vmemmap_pages(). - In patch 4, add Acked-by from David Hildenbrand. Muchun Song (6): mm/sparse-vmemmap: Fix vmemmap accounting underflow mm/memory_hotplug: Fix incorrect altmap passing in error path mm/sparse-vmemmap: Pass @pgmap argument to memory deactivation paths mm/sparse-vmemmap: Fix DAX vmemmap accounting with optimization mm/mm_init: Fix pageblock migratetype for ZONE_DEVICE compound pages mm/mm_init: Fix uninitialized struct pages for ZONE_DEVICE arch/arm64/mm/mmu.c | 5 +-- arch/loongarch/mm/init.c | 5 +-- arch/powerpc/mm/mem.c | 5 +-- arch/riscv/mm/init.c | 5 +-- arch/s390/mm/init.c | 5 +-- arch/x86/mm/init_64.c | 5 +-- include/linux/memory_hotplug.h | 8 +++-- mm/memory_hotplug.c | 13 ++++---- mm/memremap.c | 4 +-- mm/mm_init.c | 47 ++++++++++++++++----------- mm/sparse-vmemmap.c | 58 ++++++++++++++++++++++++++-------- 11 files changed, 105 insertions(+), 55 deletions(-) base-commit: 39704f00f747aba3144289870b5fd8ac230a9aaf -- 2.20.1