[PATCH v1 00/16] mm: cleanups around unmapping / zapping

David Hildenbrand (Arm)
2026-02-27T20:09:17Z

A bunch of cleanups around unmapping and zapping. Mostly simplifications,
code movements, documentation and renaming of zapping functions.

With this series, we'll have the following high-level zap/unmap functions
(excluding high-level folio zapping):
* unmap_vmas() for actual unmapping (vmas will go away)
* zap_vma(): zap all page table entries in a vma
* zap_vma_for_reaping(): zap_vma() that must not block
* zap_vma_range(): zap a range of page table entries
* zap_vma_range_batched(): zap_vma_range() with more options and batching
* zap_special_vma_range(): limited zap_vma_range() for modules
* __zap_vma_range(): internal helper

Patch #1 is not about unmapping/zapping, but I stumbled over it while
verifying MADV_DONTNEED range handling.

Patch #16 is related to [1], but makes sense even independent of that.

[1] https://lore.kernel.org/r/aYSKyr7StGpGKNqW@google.com

The CC list is already long enough. As these are simple changes to
drivers/arch code, I'm only CCing maintainers of all changes but only
reviewers of the MM bits.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Jann Horn <jannh@google.com>
Cc: Pedro Falcato <pfalcato@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Arve Hjønnevåg" <arve@android.com>
Cc: Todd Kjos <tkjos@android.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Carlos Llamas <cmllamas@google.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: David Ahern <dsahern@kernel.org>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Miguel Ojeda <ojeda@kernel.org>

Cc: linuxppc-dev@lists.ozlabs.org
Cc: kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org
Cc: linux-sgx@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-rdma@vger.kernel.org
Cc: bpf@vger.kernel.org
Cc: linux-perf-users@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: rust-for-linux@vger.kernel.org
Cc: x86@kernel.org

David Hildenbrand (Arm) (16):
mm/madvise: drop range checks in madvise_free_single_vma()
mm/memory: remove "zap_details" parameter from zap_page_range_single()
mm/memory: inline unmap_mapping_range_vma() into
unmap_mapping_range_tree()
mm/memory: simplify calculation in unmap_mapping_range_tree()
mm/oom_kill: use MMU_NOTIFY_CLEAR in __oom_reap_task_mm()
mm/oom_kill: factor out zapping of VMA into zap_vma_for_reaping()
mm/memory: rename unmap_single_vma() to __zap_vma_range()
mm/memory: move adjusting of address range to unmap_vmas()
mm/memory: convert details->even_cows into details->skip_cows
mm/memory: use __zap_vma_range() in zap_vma_for_reaping()
mm/memory: inline unmap_page_range() into __zap_vma_range()
mm: rename zap_vma_pages() to zap_vma()
mm: rename zap_page_range_single_batched() to zap_vma_range_batched()
mm: rename zap_page_range_single() to zap_vma_range()
mm: rename zap_vma_ptes() to zap_special_vma_range()
mm/memory: support VM_MIXEDMAP in zap_special_vma_range()

arch/powerpc/platforms/book3s/vas-api.c | 2 +-
arch/powerpc/platforms/pseries/vas.c | 2 +-
arch/s390/mm/gmap_helpers.c | 2 +-
arch/x86/kernel/cpu/sgx/encl.c | 2 +-
drivers/android/binder/page_range.rs | 4 +-
drivers/android/binder_alloc.c | 2 +-
drivers/comedi/comedi_fops.c | 2 +-
drivers/gpu/drm/i915/i915_mm.c | 4 +-
drivers/infiniband/core/uverbs_main.c | 6 +-
drivers/misc/sgi-gru/grumain.c | 2 +-
include/linux/mm.h | 23 ++-
kernel/bpf/arena.c | 3 +-
kernel/events/core.c | 2 +-
lib/vdso/datastore.c | 2 +-
mm/internal.h | 7 +-
mm/interval_tree.c | 5 -
mm/madvise.c | 24 +--
mm/memory.c | 217 ++++++++++++------------
mm/oom_kill.c | 15 +-
mm/page-writeback.c | 2 +-
net/ipv4/tcp.c | 7 +-
rust/kernel/mm/virt.rs | 4 +-
22 files changed, 162 insertions(+), 177 deletions(-)

base-commit: df9c51269a5e2a6fbca2884a756a4011a5e78748
--
2.43.0