s390 architecture · Supported

Maintainers

• M Heiko Carstens <hca@linux.ibm.com>
• M Vasily Gorbik <gor@linux.ibm.com>
• M Alexander Gordeev <agordeev@linux.ibm.com>
• R Christian Borntraeger <borntraeger@linux.ibm.com>
• R Sven Schnelle <svens@linux.ibm.com>

Paths

• F Documentation/driver-api/s390-drivers.rst
• F Documentation/arch/s390/
• F arch/s390/
• F drivers/s390/
• F drivers/watchdog/diag288_wdt.c

Last 30 days

Most active threads (last 7 days)

• HOTtoday [PATCH RFC] mm/huge_memory: eliminate reference-counted huge zero folio
  2026-07-28 13:06 · 0 replies in 7d · "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
• WARM1d [PATCH v6 00/14] mm: thp: always enable mTHP support
  2026-07-24 01:35 · 2 replies in 7d · Luiz Capitulino <hidden>
• COOLING4d [PATCH v7 0/8] seccomp: non-cooperative pinned-memfd argument redirect
  2026-07-24 22:02 · 1 reply in 7d · Cong Wang <hidden>
• WARM1d [PATCH v5 00/11] mm: PMD-level swap entries for anonymous THPs
  2026-07-22 15:21 · 1 reply in 7d · Usama Arif <usama.arif@linux.dev>

Active reviewers (last 30 days)

• Mike Rapoport (Microsoft) <rppt@kernel.org>
  7 attestations (3 Acked-by, 4 Reviewed-by) · last on 2026-07-16
• SeongJae Park <sj@kernel.org>
  6 attestations (3 Acked-by, 3 Reviewed-by) · last on 2026-07-08
• Ilya Leoshkevich <iii@linux.ibm.com>
  2 attestations (2 Suggested-by) · last on 2026-07-15
• Zi Yan <ziy@nvidia.com>
  2 attestations (2 Reviewed-by) · last on 2026-07-06
• Heiko Carstens <hca@linux.ibm.com>
  1 attestation (1 Acked-by) · last on 2026-07-16
• Muchun Song <muchun.song@linux.dev>
  1 attestation (1 Reviewed-by) · last on 2026-07-16

Recent patches

Most-recent 30 patches in this subsystem on linux-mm (capped at 30), ordered by date desc.

• HOTtoday [PATCH RFC] mm/huge_memory: eliminate reference-counted huge zero folio
  2026-07-28 · "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
• COOLING4d [PATCH v7 1/8] mm: pass the target mm parameter through get_unmapped_area family
  2026-07-24 · Cong Wang <hidden>
• WARM1d [PATCH v6 12/14] treewide: introduce arch_has_pmd_leaves()
  2026-07-24 · Luiz Capitulino <hidden>
• WARM1d [PATCH v6 08/14] s390: move has_transparent_hugepage() out of THP guard
  2026-07-24 · Luiz Capitulino <hidden>
• WARM1d [PATCH v5 01/11] mm: add PMD swap entry detection support
  2026-07-22 · Usama Arif <usama.arif@linux.dev>
• COOLING8d [RFC PATCH 4/4] s390/mm: implement __ptent-aware pte_t type
  2026-07-17 · Alexander Gordeev <agordeev@linux.ibm.com>
• COOLING11d IN LINUX-NEXT: 16 (16M) [PATCH v2 03/10] s390/mm: use free_reserved_pages() in vmem_free_pages()
  2026-07-16 · "David Hildenbrand (Arm)" <david@kernel.org>
• COOLING12d [RFC PATCH 22/24] pidfd: expose spawn builder system calls
  2026-07-16 · Li Chen <hidden>
• COOLING13d [PATCH v6 1/8] mm: pass the target mm parameter through get_unmapped_area family
  2026-07-15 · Cong Wang <hidden>
• COOLING13d [PATCH v6 4/4] s390/mm: Lazy MMU mode sanitizer
  2026-07-15 · Alexander Gordeev <agordeev@linux.ibm.com>
• COOLING13d [PATCH v6 2/4] s390/mm: Batch PTE updates in lazy MMU mode
  2026-07-15 · Alexander Gordeev <agordeev@linux.ibm.com>
• COOLING4d [PATCH 09/22] s390: mm: use mm_is_kernel() for kernel mm checks
  2026-07-14 · Kevin Brodsky <hidden>
• COOLING13d [PATCH v5 4/4] s390/mm: Lazy MMU mode sanitizer
  2026-07-13 · Alexander Gordeev <agordeev@linux.ibm.com>
• COOLING13d [PATCH v5 2/4] s390/mm: Batch PTE updates in lazy MMU mode
  2026-07-13 · Alexander Gordeev <agordeev@linux.ibm.com>
• COLD19d [PATCH 03/10] s390/mm: use free_reserved_pages() in vmem_free_pages()
  2026-07-08 · "David Hildenbrand (Arm)" <david@kernel.org>
• COLD19d IN LINUX-NEXT: 12 (12M) [PATCH v10 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD19d IN LINUX-NEXT: 12 (12M) [PATCH v10 01/15] mm: decouple protnone helpers from CONFIG_NUMA_BALANCING
  2026-07-08 · Kiryl Shutsemau <hidden>
• COLD22d IN LINUX-NEXT: 3 (3M) [PATCH v2 6/6] mm: rename ARCH_ENABLE_THP_MIGRATION to ARCH_HAS_PMD_SOFTLEAVES
  2026-07-06 · Usama Arif <usama.arif@linux.dev>
• COLD22d REVIEWED: 12 (12M) [PATCH v9 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD22d REVIEWED: 12 (12M) [PATCH v9 01/15] mm: decouple protnone helpers from CONFIG_NUMA_BALANCING
  2026-07-06 · Kiryl Shutsemau <hidden>
• COLD19d [PATCH v3 01/11] mm: add PMD swap entry detection support
  2026-07-03 · Usama Arif <usama.arif@linux.dev>
• COLD25d REVIEWED: 12 (12M) [PATCH v8 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-07-03 · Kiryl Shutsemau <hidden>
• COLD25d REVIEWED: 12 (12M) [PATCH v8 01/15] mm: decouple protnone helpers from CONFIG_NUMA_BALANCING
  2026-07-03 · Kiryl Shutsemau <hidden>
• COOLING12d [PATCH v3 06/11] mm/cma: Allow dynamically creating CMA areas
  2026-07-01 · Thierry Reding <thierry.reding@kernel.org>
• COLD23d REVIEWED: 3 (3M) [PATCH 6/6] mm: rename ARCH_ENABLE_THP_MIGRATION to ARCH_SUPPORTS_PMD_SOFTLEAF
  2026-06-30 · Usama Arif <usama.arif@linux.dev>
• COLD19d [PATCH v16 02/18] syscall_user_dispatch: Introduce a weak fallback for arch_syscall_is_vdso_sigreturn()
  2026-06-29 · Jinjie Ruan <hidden>
• COLD29d REVIEWED: 12 (12M) [PATCH v7 03/15] mm: rename uffd-wp PTE accessors to uffd
  2026-06-29 · Kiryl Shutsemau <hidden>
• COLD29d REVIEWED: 12 (12M) [PATCH v7 01/15] mm: decouple protnone helpers from CONFIG_NUMA_BALANCING
  2026-06-29 · Kiryl Shutsemau <hidden>
• COLD16d [RFC PATCH v3] mm: retry page faults under per-VMA lock when mmap_lock is not required
  2026-06-26 · Hongru Zhang <hidden>
• DORMANTno replies [PATCH 11/11] mm: Remove VM_FAULT_COMPLETED
  2026-06-25 · "Matthew Wilcox (Oracle)" <willy@infradead.org>

Needs attention (review trailers in, no pickup)

Patches with review trailers that haven't landed in mainline and haven't been Acked by a maintainer. Oldest first.

• STALE144d REVIEWED: 1 (0M) [PATCH v10 02/15] set_memory: add folio_{zap,restore}_direct_map helpers
  2026-01-26 · Kalyazin, Nikita <hidden> · 1 Reviewed-by
• STALE152d REVIEWED: 2 (2M) [PATCH 4/4] s390: Enable page table check for debug_defconfig
  2026-02-23 · Alexander Gordeev <agordeev@linux.ibm.com> · 1 Reviewed-by
• STALE152d REVIEWED: 2 (2M) [PATCH 3/4] s390/pgtable: Add s390 support for page table check
  2026-02-23 · Alexander Gordeev <agordeev@linux.ibm.com> · 1 Reviewed-by

Quiet for 30+ days

Patches with no review trailers and no replies. Either the author is heads-down elsewhere or these slipped through. Oldest first.

• STALE159d [PATCH v2 16/28] s390: introduce arch_zone_limits_init()
  2026-01-02 · Mike Rapoport <rppt@kernel.org>
• STALE159d [PATCH v2 23/28] arch, mm: consolidate initialization of SPARSE memory model
  2026-01-02 · Mike Rapoport <rppt@kernel.org>
• STALE159d [PATCH v2 26/28] mm, arch: consolidate hugetlb CMA reservation
  2026-01-02 · Mike Rapoport <rppt@kernel.org>
• STALE141d [PATCH v3 27/29] mm, arch: consolidate hugetlb CMA reservation
  2026-01-11 · Mike Rapoport <rppt@kernel.org>
• STALE111d [PATCH v2 08/11] treewide: rename has_transparent_hugepage() to arch_has_pmd_leaves()
  2026-02-09 · Luiz Capitulino <hidden>
• STALE141d [RFC v2 15/21] mm: thp: remove pgtable_trans_huge_{deposit/withdraw} when not needed
  2026-02-26 · Usama Arif <usama.arif@linux.dev>
• STALE131d [PATCH 09/15] s390: Remove AT_VECTOR_SIZE_ARCH from UAPI
  2026-03-02 · Thomas Weißschuh <hidden>
• STALE117d [PATCH 3/8] net: use rest_of_page() macro where appropriate
  2026-03-04 · Yury Norov <hidden>
• STALE117d [PATCH 6/8] KVM: use rest_of_page() macro where appropriate
  2026-03-04 · Yury Norov <hidden>
• STALE103d [PATCH 43/61] s390: Prefer IS_ERR_OR_NULL over manual NULL check
  2026-03-10 · Philipp Hahn <hidden>