Merge tag 'mm-hotfixes-stable-2026-11-04-20-02' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM fixes from Andrew Morton:

 - "mm: avoid losing atomic VMA flags" (Lorenzo Stoakes):

   Preserve guard-page and soft-dirty state across VMA changes. Prevent
   fork and THP collapse from losing guard markers, and keep changes
   visible to applications which track modified memory.

 - "MAINTAINERS: MM updates" (David Hildenbrand):

   Start routing more MM components through mm/core.git and add Zi Yan
   as a THP co-maintainer. Update component coverage and integration
   branches as part of the transition to separate MM component trees.

 - "mm/hugetlb: fix mremap bugs" (Li Zhe):

   Fix hugetlb mremap deadlocks and truncated move lengths. Prevent
   userfaultfd poison markers from affecting other processes through
   shared hugetlb page tables.

 - "MAINTAINERS updates for page and slab allocators" (Vlastimil Babka):

   Add Johannes Weiner as a page allocator co-maintainer and update page
   and slab allocator entries for their component trees and integration
   through mm/linux.

 - "mm/damon: fix three race bugs in sysfs and core" (SJ Park):

   Serialize DAMOS tuning updates and stop monitoring contexts from
   sharing mutable state. Avoid interference between concurrent DAMON
   instances and incorrect auto-tuning.

 - "mm: page_alloc: fix reserve access for non-blocking requests"
   (Johannes Weiner):

   Stop ordinary non-blocking allocations from consuming reserves or
   bypassing watermarks. Avoid severe allocation stalls under memory
   pressure and preserve reserves for requests entitled to use them.

 - "mm/cma: accept memory of CMA areas reserved with memblock_reserve()"
   (Mike Rapoport):

   Accept memory in fixed-address and multi-range CMA reservations.
   Prevent fatal accesses to these pages in TDX and SEV-SNP guests.

 - Summary of singletons in this merge:

   Several fixes address crashes and unsafe memory access. Failed THP
   collapse now flushes stale translations before releasing pages which
   another collapse can free. A truncation race with MADV_DONTNEED could
   remove still-mapped shmem pages and hit a kernel BUG. Large-folio
   page-table scans no longer wrap addresses and crash near
   address-space boundaries. Hugetlb vmemmap optimization no longer
   causes write faults from racing reference-count operations.
   Memory-cgroup teardown is also protected against reclaim work
   accessing released state.

   KSM now preserves userfaultfd protection during merging and
   unmerging, and retains soft-dirty information needed by incremental
   memory dumpers. Reads of /proc/PID/maps and related files no longer
   omit continuously mapped ranges during concurrent VMA changes. There
   are also fixes for expanding mixed mappings with mremap() and
   querying NUMA placement with tagged addresses. Swapoff checks for
   signals while processing large address spaces and shmem files, so it
   can be interrupted without holding up suspend until the whole object
   is read.

   Costly allocations with cheap smaller-order fallbacks avoid direct
   reclaim and compaction. Reported arm64 PostgreSQL tests improved from
   58,602 to 157,246 transactions per second with defrag_mode disabled;
   this addresses a buffered-write regression under fragmentation.
   Background reclaim can recover on the highest-numbered memory node
   after it has given up, and 32-bit writeback threshold calculations no
   longer overflow and assign incorrect dirty-memory limits.

* tag 'mm-hotfixes-stable-2026-11-04-20-02' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (43 commits)
  MAINTAINERS: move SLAB ALLOCATOR under MEMORY MANAGEMENT
  MAINTAINERS: add Johannes as the page allocator co-maintainer
  MAINTAINERS: route more MM changes through mm/core.git
  MAINTAINERS: rename and move MEMORY HOT(UN)PLUG
  MAINTAINERS: add missing files to MM component sections
  MAINTAINERS: sort entries in MM sections
  MAINTAINERS: add Zi Yan as co-maintainer for MEMORY MANAGEMENT - THP
  MAINTAINERS: TMPFS (SHMEM FILESYSTEM) updates
  MAINTAINERS: mention for-next branch in MEMORY MANAGEMENT - MEMORY MAP
  mm: memcontrol: fix NULL pointer deref and UAF from high_work_func() on dying memcg
  mm/cma: accept memory of CMA areas reserved at a fixed address
  mm/cma: accept memory of multi-range CMA areas
  mm/page_alloc: avoid direct reclaim and compaction for costly __GFP_NORETRY allocations
  mm: page_alloc: remove ALLOC_NON_BLOCK from ALLOC_RESERVES
  mm: page_alloc: do not give all non-blocking requests reserve access
  mm/hugetlb_vmemmap: map the shared tail page writable
  fs/proc/task_mmu: fix missed VMAs when reading /proc/PID/maps and friends
  selftests/mm: fix khugepaged_race build with older glibc
  mm/vma: update VMA iterator state on error in new VMA merge
  mm/migrate: snapshot the source nid before the misplaced migration
  ...

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