Changes in Kconfig

97bd80a91858ea72be5aa4565af2721fb732eba6 - treewide: fix indentation and whitespace in Kconfig files

Tue, 07 Apr 2026 07:39:34 +0200

treewide: fix indentation and whitespace in Kconfig filesClean up inconsistent indentation (mixing tabs and spaces) and removeextraneous whitespace in several Kconfig files across the tree. This is apurely cosmetic change to improve readability.Adjust indentation from spaces to tab (+optional two spaces) as incoding style with command like:$ sed -e 's/^ /\t/' -i */KconfigLink: https://lore.kernel.org/20260407053945.14116-1-linux.amoon@gmail.comSigned-off-by: Anand Moon Reviewed-by: Jan Kara [fs]Reviewed-by: Liam R. Howlett [mm]Reviewed-by: Lorenzo Stoakes [mm]Reviewed-by: Christian Brauner Signed-off-by: Andrew Morton List of files: /linux/fs/Kconfig

47503f989736d6c4c9f8bfca1c28d267473ccd4b - ntfs: add Kconfig and Makefile

Mon, 02 Feb 2026 08:00:57 +0100

ntfs: add Kconfig and MakefileIntroduce Kconfig and Makefile for remade ntfs.And this patch make ntfs and ntfs3 mutually exclusive so only one can bebuilt-in(y), while both can still be built as modules(m).Reviewed-by: Amir Goldstein Reviewed-by: Christoph Hellwig Acked-by: Christoph Hellwig Signed-off-by: Namjae Jeon List of files: /linux/fs/Kconfig

8804d970fab45726b3c7cd7f240b31122aa94219 - Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Fri, 03 Oct 2025 03:18:33 +0200

Merge tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmPull MM updates from Andrew Morton: - "mm, swap: improve cluster scan strategy" from Kairui Song improves performance and reduces the failure rate of swap cluster allocation - "support large align and nid in Rust allocators" from Vitaly Wool permits Rust allocators to set NUMA node and large alignment when perforning slub and vmalloc reallocs - "mm/damon/vaddr: support stat-purpose DAMOS" from Yueyang Pan extend DAMOS_STAT's handling of the DAMON operations sets for virtual address spaces for ops-level DAMOS filters - "execute PROCMAP_QUERY ioctl under per-vma lock" from Suren Baghdasaryan reduces mmap_lock contention during reads of /proc/pid/maps - "mm/mincore: minor clean up for swap cache checking" from Kairui Song performs some cleanup in the swap code - "mm: vm_normal_page*() improvements" from David Hildenbrand provides code cleanup in the pagemap code - "add persistent huge zero folio support" from Pankaj Raghav provides a block layer speedup by optionalls making the huge_zero_pagepersistent, instead of releasing it when its refcount falls to zero - "kho: fixes and cleanups" from Mike Rapoport adds a few touchups to the recently added Kexec Handover feature - "mm: make mm->flags a bitmap and 64-bit on all arches" from Lorenzo Stoakes turns mm_struct.flags into a bitmap. To end the constant struggle with space shortage on 32-bit conflicting with 64-bit's needs - "mm/swapfile.c and swap.h cleanup" from Chris Li cleans up some swap code - "selftests/mm: Fix false positives and skip unsupported tests" from Donet Tom fixes a few things in our selftests code - "prctl: extend PR_SET_THP_DISABLE to only provide THPs when advised" from David Hildenbrand "allows individual processes to opt-out of THP=always into THP=madvise, without affecting other workloads on the system". It's a long story - the [1/N] changelog spells out the considerations - "Add and use memdesc_flags_t" from Matthew Wilcox gets us started on the memdesc project. Please see https://kernelnewbies.org/MatthewWilcox/Memdescs and https://blogs.oracle.com/linux/post/introducing-memdesc - "Tiny optimization for large read operations" from Chi Zhiling improves the efficiency of the pagecache read path - "Better split_huge_page_test result check" from Zi Yan improves our folio splitting selftest code - "test that rmap behaves as expected" from Wei Yang adds some rmap selftests - "remove write_cache_pages()" from Christoph Hellwig removes that function and converts its two remaining callers - "selftests/mm: uffd-stress fixes" from Dev Jain fixes some UFFD selftests issues - "introduce kernel file mapped folios" from Boris Burkov introduces the concept of "kernel file pages". Using these permits btrfs to account its metadata pages to the root cgroup, rather than to the cgroups of random inappropriate tasks - "mm/pageblock: improve readability of some pageblock handling" from Wei Yang provides some readability improvements to the page allocator code - "mm/damon: support ARM32 with LPAE" from SeongJae Park teaches DAMON to understand arm32 highmem - "tools: testing: Use existing atomic.h for vma/maple tests" from Brendan Jackman performs some code cleanups and deduplication under tools/testing/ - "maple_tree: Fix testing for 32bit compiles" from Liam Howlett fixes a couple of 32-bit issues in tools/testing/radix-tree.c - "kasan: unify kasan_enabled() and remove arch-specific implementations" from Sabyrzhan Tasbolatov moves KASAN arch-specific initialization code into a common arch-neutral implementation - "mm: remove zpool" from Johannes Weiner removes zspool - an indirection layer which now only redirects to a single thing (zsmalloc) - "mm: task_stack: Stack handling cleanups" from Pasha Tatashin makes a couple of cleanups in the fork code - "mm: remove nth_page()" from David Hildenbrand makes rather a lot of adjustments at various nth_page() callsites, eventually permitting the removal of that undesirable helper function - "introduce kasan.write_only option in hw-tags" from Yeoreum Yun creates a KASAN read-only mode for ARM, using that architecture's memory tagging feature. It is felt that a read-only mode KASAN is suitable for use in production systems rather than debug-only - "mm: hugetlb: cleanup hugetlb folio allocation" from Kefeng Wang does some tidying in the hugetlb folio allocation code - "mm: establish const-correctness for pointer parameters" from Max Kellermann makes quite a number of the MM API functions more accurate about the constness of their arguments. This was getting in the way of subsystems (in this case CEPH) when they attempt to improving their own const/non-const accuracy - "Cleanup free_pages() misuse" from Vishal Moola fixes a number of code sites which were confused over when to use free_pages() vs __free_pages() - "Add Rust abstraction for Maple Trees" from Alice Ryhl makes the mapletree code accessible to Rust. Required by nouveau and by its forthcoming successor: the new Rust Nova driver - "selftests/mm: split_huge_page_test: split_pte_mapped_thp improvements" from David Hildenbrand adds a fix and some cleanups to the thp selftesting code - "mm, swap: introduce swap table as swap cache (phase I)" from Chris Li and Kairui Song is the first step along the path to implementing "swap tables" - a new approach to swap allocation and state tracking which is expected to yield speed and space improvements. This patchset itself yields a 5-20% performance benefit in some situations - "Some ptdesc cleanups" from Matthew Wilcox utilizes the new memdesc layer to clean up the ptdesc code a little - "Fix va_high_addr_switch.sh test failure" from Chunyu Hu fixes some issues in our 5-level pagetable selftesting code - "Minor fixes for memory allocation profiling" from Suren Baghdasaryan addresses a couple of minor issues in relatively new memory allocation profiling feature - "Small cleanups" from Matthew Wilcox has a few cleanups in preparation for more memdesc work - "mm/damon: add addr_unit for DAMON_LRU_SORT and DAMON_RECLAIM" from Quanmin Yan makes some changes to DAMON in furtherance of supporting arm highmem - "selftests/mm: Add -Wunreachable-code and fix warnings" from Muhammad Anjum adds that compiler check to selftests code and fixes the fallout, by removing dead code - "Improvements to Victim Process Thawing and OOM Reaper Traversal Order" from zhongjinji makes a number of improvements in the OOM killer: mainly thawing a more appropriate group of victim threads so they can release resources - "mm/damon: misc fixups and improvements for 6.18" from SeongJae Park is a bunch of small and unrelated fixups for DAMON - "mm/damon: define and use DAMON initialization check function" from SeongJae Park implement reliability and maintainability improvements to a recently-added bug fix - "mm/damon/stat: expose auto-tuned intervals and non-idle ages" from SeongJae Park provides additional transparency to userspace clients of the DAMON_STAT information - "Expand scope of khugepaged anonymous collapse" from Dev Jain removes some constraints on khubepaged's collapsing of anon VMAs. It also increases the success rate of MADV_COLLAPSE against an anon vma - "mm: do not assume file == vma->vm_file in compat_vma_mmap_prepare()" from Lorenzo Stoakes moves us further towards removal of file_operations.mmap(). This patchset concentrates upon clearing up the treatment of stacked filesystems - "mm: Improve mlock tracking for large folios" from Kiryl Shutsemau provides some fixes and improvements to mlock's tracking of large folios. /proc/meminfo's "Mlocked" field became more accurate - "mm/ksm: Fix incorrect accounting of KSM counters during fork" from Donet Tom fixes several user-visible KSM stats inaccuracies across forks and adds selftest code to verify these counters - "mm_slot: fix the usage of mm_slot_entry" from Wei Yang addresses some potential but presently benign issues in KSM's mm_slot handling* tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (372 commits) mm: swap: check for stable address space before operating on the VMA mm: convert folio_page() back to a macro mm/khugepaged: use start_addr/addr for improved readability hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list alloc_tag: fix boot failure due to NULL pointer dereference mm: silence data-race in update_hiwater_rss mm/memory-failure: don't select MEMORY_ISOLATION mm/khugepaged: remove definition of struct khugepaged_mm_slot mm/ksm: get mm_slot by mm_slot_entry() when slot is !NULL hugetlb: increase number of reserving hugepages via cmdline selftests/mm: add fork inheritance test for ksm_merging_pages counter mm/ksm: fix incorrect KSM counter handling in mm_struct during fork drivers/base/node: fix double free in register_one_node() mm: remove PMD alignment constraint in execmem_vmalloc() mm/memory_hotplug: fix typo 'esecially' -> 'especially' mm/rmap: improve mlock tracking for large folios mm/filemap: map entire large folio faultaround mm/fault: try to map the entire file folio in finish_fault() mm/rmap: mlock large folios in try_to_unmap_one() mm/rmap: fix a mlock race condition in folio_referenced_one() ... List of files: /linux/fs/Kconfig

f2c61db29f277b9c80de92102fc532cc247495cd - Remove bcachefs core code

Mon, 29 Sep 2025 22:43:52 +0200

Remove bcachefs core codebcachefs was marked 'externally maintained' in 6.17 but the coderemained to make the transition smoother.It's now a DKMS module, making the in-kernel code stale, so removeit to avoid any version confusion.Link: https://lore.kernel.org/linux-bcachefs/yokpt2d2g2lluyomtqrdvmkl3amv3kgnipmenobkpgx537kay7@xgcgjviv3n7x/T/Signed-off-by: Linus Torvalds List of files: /linux/fs/Kconfig

c090868f59ce888db838cf543d18f731d13ed498 - Revert "hugetlb: make hugetlb depends on SYSFS or SYSCTL"

Tue, 26 Aug 2025 05:09:55 +0200

Revert "hugetlb: make hugetlb depends on SYSFS or SYSCTL"Commit f8142cf94d47 ("hugetlb: make hugetlb depends on SYSFS or SYSCTL")added dependency on SYSFS or SYSCTL but hugetlb can be used without SYSFSor SYSCTL. So this dependency is wrong and should be removed.For users with CONFIG_SYSFS or CONFIG_SYSCTL on, there should be nodifference. For users have CONFIG_SYSFS and CONFIG_SYSCTL bothundefined, hugetlbfs can still works perfectly well through cmdlineexcept a possible kismet warning[1] when select CONFIG_HUGETLBFS. IMHO, it might not worth a backport.This reverts commit f8142cf94d4737ea0c3baffb3b9bad8addcb9b6b. Itoverlooked the scenario of using hugetlb through boot parameters whenit was submitted.Link: https://lkml.kernel.org/r/20250826030955.2898709-1-linmiaohe@huawei.comLink: https://lore.kernel.org/all/5c99458f-4a91-485f-8a35-3618a992e2e4@csgroup.eu/ [1]Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202508222032.bwJsQPZ1-lkp@intel.com/Signed-off-by: Miaohe Lin Cc: David Hildenbrand Cc: Muchun Song Cc: Oscar Salvador Signed-off-by: Andrew Morton List of files: /linux/fs/Kconfig

6470fb2bb1812cac0a80a290bb193a9d866dd39d - fs/Kconfig: enable HUGETLBFS only if ARCH_SUPPORTS_HUGETLBFS

Fri, 11 Jul 2025 12:29:34 +0200

fs/Kconfig: enable HUGETLBFS only if ARCH_SUPPORTS_HUGETLBFSEnable HUGETLBFS only when platform subscrbes via ARCH_SUPPORTS_HUGETLBFS.Hence select ARCH_SUPPORTS_HUGETLBFS on existing x86 and sparc for theircontinuing HUGETLBFS support. While here also just drop existing 'BROKEN'dependency.Link: https://lkml.kernel.org/r/20250711102934.2399533-1-anshuman.khandual@arm.comSigned-off-by: Anshuman Khandual Cc: "David S. Miller" Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Christian Brauner Signed-off-by: Andrew Morton List of files: /linux/fs/Kconfig

28dc88c39ecfe7de5033fa05cdd24fd1a9f8267d - fs/dax: remove FS_DAX_LIMITED config option

Thu, 19 Jun 2025 10:58:02 +0200

fs/dax: remove FS_DAX_LIMITED config optionThe dcssblk driver was the last user of FS_DAX_LIMITED. That was markedbroken by 653d7825c149 ("dcssblk: mark DAX broken, remove FS_DAX_LIMITEDsupport") to allow removal of PFN_SPECIAL. However the FS_DAX_LIMITEDconfig option itself was not removed, so do that now.Link: https://lkml.kernel.org/r/b47bf164b4a1013d736fa1a3d501bc8b8e71311f.1750323463.git-series.apopple@nvidia.comSigned-off-by: Alistair Popple Acked-by: David Hildenbrand Cc: Balbir Singh Cc: Björn Töpel Cc: Björn Töpel Cc: Christoph Hellwig Cc: Chunyan Zhang Cc: Dan Williams Cc: Deepak Gupta Cc: Gerald Schaefer Cc: Inki Dae Cc: Jason Gunthorpe Cc: John Groves Cc: John Hubbard Cc: Lorenzo Stoakes Cc: Matthew Wilcox (Oracle) Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux/fs/Kconfig

bff70402d6d67843fe319338e4c56e1cba13fbd8 - fs/resctrl: Add boiler plate for external resctrl code

Thu, 15 May 2025 18:58:45 +0200

fs/resctrl: Add boiler plate for external resctrl codeAdd Makefile and Kconfig for fs/resctrl. Add ARCH_HAS_CPU_RESCTRLfor the common parts of the resctrl interface and make X86_CPU_RESCTRLselect this.Adding an include of asm/resctrl.h to linux/resctrl.h allows the/fs/resctrl files to switch over to using this header instead.Co-developed-by: Dave Martin Signed-off-by: Dave Martin Signed-off-by: James Morse Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Shaopeng Tan Reviewed-by: Tony Luck Reviewed-by: Fenghua Yu Reviewed-by: Reinette Chatre Tested-by: Fenghua Yu Tested-by: Carl Worth # arm64Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Amit Singh Tomar # arm64Tested-by: Shanker Donthineni # arm64Tested-by: Babu Moger Tested-by: Tony Luck Link: https://lore.kernel.org/20250515165855.31452-16-james.morse@arm.com List of files: /linux/fs/Kconfig

1ca0f935a126950c2f0b305a50f31f3b00542b0d - Merge tag 'nfsd-6.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Sat, 19 Apr 2025 19:38:03 +0200

Merge tag 'nfsd-6.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linuxPull nfsd fixes from Chuck Lever: - v6.15 libcrc clean-up makes invalid configurations possible - Fix a potential deadlock introduced during the v6.15 merge window* tag 'nfsd-6.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: nfsd: decrease sc_count directly if fail to queue dl_recall nfs: add missing selections of CONFIG_CRC32 List of files: /linux/fs/Kconfig

cd35b6cb46649750b7dbd0df0e2d767415d8917b - nfs: add missing selections of CONFIG_CRC32

Wed, 02 Apr 2025 00:02:21 +0200

nfs: add missing selections of CONFIG_CRC32nfs.ko, nfsd.ko, and lockd.ko all use crc32_le(), which is availableonly when CONFIG_CRC32 is enabled. But the only NFS kconfig option thatselected CONFIG_CRC32 was CONFIG_NFS_DEBUG, which is client-specific anddid not actually guard the use of crc32_le() even on the client.The code worked around this bug by only actually calling crc32_le() whenCONFIG_CRC32 is built-in, instead hard-coding '0' in other cases. Thisavoided randconfig build errors, and in real kernels the fallback codewas unlikely to be reached since CONFIG_CRC32 is 'default y'. But, thisreally needs to just be done properly, especially now that I'm planningto update CONFIG_CRC32 to not be 'default y'.Therefore, make CONFIG_NFS_FS, CONFIG_NFSD, and CONFIG_LOCKD selectCONFIG_CRC32. Then remove the fallback code that becomes unnecessary,as well as the selection of CONFIG_CRC32 from CONFIG_NFS_DEBUG.Fixes: 1264a2f053a3 ("NFS: refactor code for calculating the crc32 hash of a filehandle")Signed-off-by: Eric Biggers Acked-by: Anna Schumaker Signed-off-by: Chuck Lever List of files: /linux/fs/Kconfig

eb0ece16027f8223d5dc9aaf90124f70577bd22a - Merge tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Tue, 01 Apr 2025 18:29:18 +0200

Merge tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmPull MM updates from Andrew Morton: - The series "Enable strict percpu address space checks" from Uros Bizjak uses x86 named address space qualifiers to provide compile-time checking of percpu area accesses. This has caused a small amount of fallout - two or three issues were reported. In all cases the calling code was found to be incorrect. - The series "Some cleanup for memcg" from Chen Ridong implements some relatively monir cleanups for the memcontrol code. - The series "mm: fixes for device-exclusive entries (hmm)" from David Hildenbrand fixes a boatload of issues which David found then using device-exclusive PTE entries when THP is enabled. More work is needed, but this makes thins better - our own HMM selftests now succeed. - The series "mm: zswap: remove z3fold and zbud" from Yosry Ahmed remove the z3fold and zbud implementations. They have been deprecated for half a year and nobody has complained. - The series "mm: further simplify VMA merge operation" from Lorenzo Stoakes implements numerous simplifications in this area. No runtime effects are anticipated. - The series "mm/madvise: remove redundant mmap_lock operations from process_madvise()" from SeongJae Park rationalizes the locking in the madvise() implementation. Performance gains of 20-25% were observed in one MADV_DONTNEED microbenchmark. - The series "Tiny cleanup and improvements about SWAP code" from Baoquan He contains a number of touchups to issues which Baoquan noticed when working on the swap code. - The series "mm: kmemleak: Usability improvements" from Catalin Marinas implements a couple of improvements to the kmemleak user-visible output. - The series "mm/damon/paddr: fix large folios access and schemes handling" from Usama Arif provides a couple of fixes for DAMON's handling of large folios. - The series "mm/damon/core: fix wrong and/or useless damos_walk() behaviors" from SeongJae Park fixes a few issues with the accuracy of kdamond's walking of DAMON regions. - The series "expose mapping wrprotect, fix fb_defio use" from Lorenzo Stoakes changes the interaction between framebuffer deferred-io and core MM. No functional changes are anticipated - this is preparatory work for the future removal of page structure fields. - The series "mm/damon: add support for hugepage_size DAMOS filter" from Usama Arif adds a DAMOS filter which permits the filtering by huge page sizes. - The series "mm: permit guard regions for file-backed/shmem mappings" from Lorenzo Stoakes extends the guard region feature from its present "anon mappings only" state. The feature now covers shmem and file-backed mappings. - The series "mm: batched unmap lazyfree large folios during reclamation" from Barry Song cleans up and speeds up the unmapping for pte-mapped large folios. - The series "reimplement per-vma lock as a refcount" from Suren Baghdasaryan puts the vm_lock back into the vma. Our reasons for pulling it out were largely bogus and that change made the code more messy. This patchset provides small (0-10%) improvements on one microbenchmark. - The series "Docs/mm/damon: misc DAMOS filters documentation fixes and improves" from SeongJae Park does some maintenance work on the DAMON docs. - The series "hugetlb/CMA improvements for large systems" from Frank van der Linden addresses a pile of issues which have been observed when using CMA on large machines. - The series "mm/damon: introduce DAMOS filter type for unmapped pages" from SeongJae Park enables users of DMAON/DAMOS to filter my the page's mapped/unmapped status. - The series "zsmalloc/zram: there be preemption" from Sergey Senozhatsky teaches zram to run its compression and decompression operations preemptibly. - The series "selftests/mm: Some cleanups from trying to run them" from Brendan Jackman fixes a pile of unrelated issues which Brendan encountered while runnimg our selftests. - The series "fs/proc/task_mmu: add guard region bit to pagemap" from Lorenzo Stoakes permits userspace to use /proc/pid/pagemap to determine whether a particular page is a guard page. - The series "mm, swap: remove swap slot cache" from Kairui Song removes the swap slot cache from the allocation path - it simply wasn't being effective. - The series "mm: cleanups for device-exclusive entries (hmm)" from David Hildenbrand implements a number of unrelated cleanups in this code. - The series "mm: Rework generic PTDUMP configs" from Anshuman Khandual implements a number of preparatoty cleanups to the GENERIC_PTDUMP Kconfig logic. - The series "mm/damon: auto-tune aggregation interval" from SeongJae Park implements a feedback-driven automatic tuning feature for DAMON's aggregation interval tuning. - The series "Fix lazy mmu mode" from Ryan Roberts fixes some issues in powerpc, sparc and x86 lazy MMU implementations. Ryan did this in preparation for implementing lazy mmu mode for arm64 to optimize vmalloc. - The series "mm/page_alloc: Some clarifications for migratetype fallback" from Brendan Jackman reworks some commentary to make the code easier to follow. - The series "page_counter cleanup and size reduction" from Shakeel Butt cleans up the page_counter code and fixes a size increase which we accidentally added late last year. - The series "Add a command line option that enables control of how many threads should be used to allocate huge pages" from Thomas Prescher does that. It allows the careful operator to significantly reduce boot time by tuning the parallalization of huge page initialization. - The series "Fix calculations in trace_balance_dirty_pages() for cgwb" from Tang Yizhou fixes the tracing output from the dirty page balancing code. - The series "mm/damon: make allow filters after reject filters useful and intuitive" from SeongJae Park improves the handling of allow and reject filters. Behaviour is made more consistent and the documention is updated accordingly. - The series "Switch zswap to object read/write APIs" from Yosry Ahmed updates zswap to the new object read/write APIs and thus permits the removal of some legacy code from zpool and zsmalloc. - The series "Some trivial cleanups for shmem" from Baolin Wang does as it claims. - The series "fs/dax: Fix ZONE_DEVICE page reference counts" from Alistair Popple regularizes the weird ZONE_DEVICE page refcount handling in DAX, permittig the removal of a number of special-case checks. - The series "refactor mremap and fix bug" from Lorenzo Stoakes is a preparatoty refactoring and cleanup of the mremap() code. - The series "mm: MM owner tracking for large folios (!hugetlb) + CONFIG_NO_PAGE_MAPCOUNT" from David Hildenbrand reworks the manner in which we determine whether a large folio is known to be mapped exclusively into a single MM. - The series "mm/damon: add sysfs dirs for managing DAMOS filters based on handling layers" from SeongJae Park adds a couple of new sysfs directories to ease the management of DAMON/DAMOS filters. - The series "arch, mm: reduce code duplication in mem_init()" from Mike Rapoport consolidates many per-arch implementations of mem_init() into code generic code, where that is practical. - The series "mm/damon/sysfs: commit parameters online via damon_call()" from SeongJae Park continues the cleaning up of sysfs access to DAMON internal data. - The series "mm: page_ext: Introduce new iteration API" from Luiz Capitulino reworks the page_ext initialization to fix a boot-time crash which was observed with an unusual combination of compile and cmdline options. - The series "Buddy allocator like (or non-uniform) folio split" from Zi Yan reworks the code to split a folio into smaller folios. The main benefit is lessened memory consumption: fewer post-split folios are generated. - The series "Minimize xa_node allocation during xarry split" from Zi Yan reduces the number of xarray xa_nodes which are generated during an xarray split. - The series "drivers/base/memory: Two cleanups" from Gavin Shan performs some maintenance work on the drivers/base/memory code. - The series "Add tracepoints for lowmem reserves, watermarks and totalreserve_pages" from Martin Liu adds some more tracepoints to the page allocator code. - The series "mm/madvise: cleanup requests validations and classifications" from SeongJae Park cleans up some warts which SeongJae observed during his earlier madvise work. - The series "mm/hwpoison: Fix regressions in memory failure handling" from Shuai Xue addresses two quite serious regressions which Shuai has observed in the memory-failure implementation. - The series "mm: reliable huge page allocator" from Johannes Weiner makes huge page allocations cheaper and more reliable by reducing fragmentation. - The series "Minor memcg cleanups & prep for memdescs" from Matthew Wilcox is preparatory work for the future implementation of memdescs. - The series "track memory used by balloon drivers" from Nico Pache introduces a way to track memory used by our various balloon drivers. - The series "mm/damon: introduce DAMOS filter type for active pages" from Nhat Pham permits users to filter for active/inactive pages, separately for file and anon pages. - The series "Adding Proactive Memory Reclaim Statistics" from Hao Jia separates the proactive reclaim statistics from the direct reclaim statistics. - The series "mm/vmscan: don't try to reclaim hwpoison folio" from Jinjiang Tu fixes our handling of hwpoisoned pages within the reclaim code.* tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (431 commits) mm/page_alloc: remove unnecessary __maybe_unused in order_to_pindex() x86/mm: restore early initialization of high_memory for 32-bits mm/vmscan: don't try to reclaim hwpoison folio mm/hwpoison: introduce folio_contain_hwpoisoned_page() helper cgroup: docs: add pswpin and pswpout items in cgroup v2 doc mm: vmscan: split proactive reclaim statistics from direct reclaim statistics selftests/mm: speed up split_huge_page_test selftests/mm: uffd-unit-tests support for hugepages > 2M docs/mm/damon/design: document active DAMOS filter type mm/damon: implement a new DAMOS filter type for active pages fs/dax: don't disassociate zero page entries MM documentation: add "Unaccepted" meminfo entry selftests/mm: add commentary about 9pfs bugs fork: use __vmalloc_node() for stack allocation docs/mm: Physical Memory: Populate the "Zones" section xen: balloon: update the NR_BALLOON_PAGES state hv_balloon: update the NR_BALLOON_PAGES state balloon_compaction: update the NR_BALLOON_PAGES state meminfo: add a per node counter for balloon drivers mm: remove references to folio in __memcg_kmem_uncharge_page() ... List of files: /linux/fs/Kconfig

d65917c42373f70159a3fc453f8f028fd665e04f - mm/sparse: allow for alternate vmemmap section init at boot

Fri, 28 Feb 2025 19:29:11 +0100

mm/sparse: allow for alternate vmemmap section init at bootAdd functions that are called just before the per-section memmap isinitialized and just before the memmap page structures are initialized. They are called sparse_vmemmap_init_nid_early andsparse_vmemmap_init_nid_late, respectively.This allows for mm subsystems to add calls to initialize memmap and pagestructures in a specific way, if using SPARSEMEM_VMEMMAP. Specifically,hugetlb can pre-HVO bootmem allocated pages that way, so that no time andresources are wasted on allocating vmemmap pages, only to free them later(and possibly unnecessarily running the system out of memory in theprocess).Refactor some code and export a few convenience functions for externaluse.In sparse_init_nid, skip any sections that are already initialized, e.g. they have been initialized by sparse_vmemmap_init_nid_early already.The hugetlb code to use these functions will be added in a later commit.Export section_map_size, as any alternate memmap init code will want touse it.The internal config option to enable this is SPARSEMEM_VMEMMAP_PREINIT,which is selected if an architecture-specific option,ARCH_WANT_HUGETLB_VMEMMAP_PREINIT, is set. In the future, if othersubsystems want to do preinit too, they can do it in a similar fashion.The internal config option is there because a section flag is used, andthe number of flags available is architecture-dependent (see mmzone.h). Architecures can decide if there is room for the flag when enablingoptions that select SPARSEMEM_VMEMMAP_PREINIT.Fortunately, as of right now, all sparse vmemmap using architectures dohave room.Link: https://lkml.kernel.org/r/20250228182928.2645936-11-fvdl@google.comSigned-off-by: Frank van der Linden Cc: Johannes Weiner Cc: Alexander Gordeev Cc: Andy Lutomirski Cc: Arnd Bergmann Cc: Dan Carpenter Cc: Dave Hansen Cc: David Hildenbrand Cc: Heiko Carstens Cc: Joao Martins Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Muchun Song Cc: Oscar Salvador Cc: Peter Zijlstra Cc: Roman Gushchin (Cruise) Cc: Usama Arif Cc: Vasily Gorbik Cc: Yu Zhao Cc: Zi Yan Signed-off-by: Andrew Morton List of files: /linux/fs/Kconfig

448fa70158f9b348e71869cfe4a31988e07b20b2 - sysv: Remove the filesystem

Thu, 20 Feb 2025 17:39:41 +0100

sysv: Remove the filesystemSince 2002 (change "Replace BKL for chain locking with sysvfs-privaterwlock") the sysv filesystem was doing IO under a rwlock in itsget_block() function (yes, a non-sleepable lock hold over a functionused to read inode metadata for all reads and writes). Nobody noticeduntil syzbot in 2023 [1]. This shows nobody is using the filesystem.Just drop it.[1] https://lore.kernel.org/all/0000000000000ccf9a05ee84f5b0@google.com/Signed-off-by: Jan Kara Link: https://lore.kernel.org/r/20250220163940.10155-2-jack@suse.czReviewed-by: Jeff Layton Reviewed-by: "Darrick J. Wong" Signed-off-by: Christian Brauner List of files: /linux/fs/Kconfig

fb6f20ecb121cef4d7946f834a6ee867c4e21b4a - reiserfs: The last commit

Thu, 17 Oct 2024 12:28:23 +0200

reiserfs: The last commitDeprecation period of reiserfs ends with the end of this year so it istime to remove it from the kernel.Acked-by: Darrick J. Wong Acked-by: Christian Brauner Signed-off-by: Jan Kara List of files: /linux/fs/Kconfig

009b15b5748549fec4f40f1142ce644a27ddc265 - nfs_common: fix Kconfig for NFS_COMMON_LOCALIO_SUPPORT

Thu, 03 Oct 2024 21:34:59 +0200

nfs_common: fix Kconfig for NFS_COMMON_LOCALIO_SUPPORTThe 'default n' that was in NFS_COMMON_LOCALIO_SUPPORT caused theseextra defaults to be missed: default y if NFSD=y || NFS_FS=y default m if NFSD=m && NFS_FS=mRemove the 'default n' for NFS_COMMON_LOCALIO_SUPPORT so that thecorrect tristate is selected based on how NFSD and NFS_FS areconfigured. This fixes the reported case where NFS_FS=y butNFS_COMMON_LOCALIO_SUPPORT=m, it is now correctly set to =y.In addition, add extra 'depends on NFS_LOCALIO' toNFS_COMMON_LOCALIO_SUPPORT so that if NFS_LOCALIO isn't set thenNFS_COMMON_LOCALIO_SUPPORT will not be either.Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202410031944.hMCFY9BO-lkp@intel.com/Signed-off-by: Mike Snitzer Signed-off-by: Anna Schumaker List of files: /linux/fs/Kconfig

684a64bf32b6e488004e0ad7f0d7e922798f65b6 - Merge tag 'nfs-for-6.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

Wed, 25 Sep 2024 00:44:18 +0200

Merge tag 'nfs-for-6.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfsPull NFS client updates from Anna Schumaker: "New Features: - Add a 'noalignwrite' mount option for lock-less 'lost writes' prevention - Add support for the LOCALIO protocol extention Bugfixes: - Fix memory leak in error path of nfs4_do_reclaim() - Simplify and guarantee lock owner uniqueness - Fix -Wformat-truncation warning - Fix folio refcounts by using folio_attach_private() - Fix failing the mount system call when the server is down - Fix detection of "Proxying of Times" server support Cleanups: - Annotate struct nfs_cache_array with __counted_by() - Remove unnecessary NULL checks before kfree() - Convert RPC_TASK_* constants to an enum - Remove obsolete or misleading comments and declerations"* tag 'nfs-for-6.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (41 commits) nfs: Fix `make htmldocs` warnings in the localio documentation nfs: add "NFS Client and Server Interlock" section to localio.rst nfs: add FAQ section to Documentation/filesystems/nfs/localio.rst nfs: add Documentation/filesystems/nfs/localio.rst nfs: implement client support for NFS_LOCALIO_PROGRAM nfs/localio: use dedicated workqueues for filesystem read and write pnfs/flexfiles: enable localio support nfs: enable localio for non-pNFS IO nfs: add LOCALIO support nfs: pass struct nfsd_file to nfs_init_pgio and nfs_init_commit nfsd: implement server support for NFS_LOCALIO_PROGRAM nfsd: add LOCALIO support nfs_common: prepare for the NFS client to use nfsd_file for LOCALIO nfs_common: add NFS LOCALIO auxiliary protocol enablement SUNRPC: replace program list with program array SUNRPC: add svcauth_map_clnt_to_svc_cred_local SUNRPC: remove call_allocate() BUG_ONs nfsd: add nfsd_serv_try_get and nfsd_serv_put nfsd: add nfsd_file_acquire_local() nfsd: factor out __fh_verify to allow NULL rqstp to be passed ... List of files: /linux/fs/Kconfig

2a33a85be45178198245e1f656e6224c899895e4 - nfs_common: add NFS LOCALIO auxiliary protocol enablement

Thu, 05 Sep 2024 21:09:48 +0200

nfs_common: add NFS LOCALIO auxiliary protocol enablementfs/nfs_common/nfslocalio.c provides interfaces that enable an NFSclient to generate a nonce (single-use UUID) and associated nfs_uuid_tstruct, register it with nfs_common for subsequent lookup andverification by the NFS server and if matched the NFS server populatesmembers in the nfs_uuid_t struct.nfs_common's nfs_uuids list is the basis for localio enablement, assuch it has members that point to nfsd memory for direct use by theclient (e.g. 'net' is the server's network namespace, through it theclient can access nn->nfsd_serv).This commit also provides the base nfs_uuid_t interfaces to allowproper net namespace refcounting for the LOCALIO use case.CONFIG_NFS_LOCALIO controls the nfs_common, NFS server and NFS clientenablement for LOCALIO. If both NFS_FS=m and NFSD=m thenNFS_COMMON_LOCALIO_SUPPORT=m and nfs_localio.ko is built (and providesnfs_common's LOCALIO support). # lsmod | grep nfs_localio nfs_localio 12288 2 nfsd,nfs sunrpc 745472 35 nfs_localio,nfsd,auth_rpcgss,lockd,nfsv3,nfsSigned-off-by: Mike Snitzer Co-developed-by: NeilBrown Signed-off-by: NeilBrown Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker List of files: /linux/fs/Kconfig

188cac58a8bcdf82c7f63275b68f7a46871e45d6 - mm/hugetlb: enforce that PMD PT sharing has split PMD PT locks

Fri, 26 Jul 2024 17:07:27 +0200

mm/hugetlb: enforce that PMD PT sharing has split PMD PT locksSharing page tables between processes but falling back to per-MM pagetable locks cannot possibly work.So, let's make sure that we do have split PMD locks by adding a newKconfig option and letting that depend on CONFIG_SPLIT_PMD_PTLOCKS.Link: https://lkml.kernel.org/r/20240726150728.3159964-3-david@redhat.comSigned-off-by: David Hildenbrand Acked-by: Mike Rapoport (Microsoft) Cc: Alexander Viro Cc: Borislav Petkov Cc: Boris Ostrovsky Cc: Christian Brauner Cc: Christophe Leroy Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: Juergen Gross Cc: Michael Ellerman Cc: Muchun Song Cc: "Naveen N. Rao" Cc: Nicholas Piggin Cc: Oscar Salvador Cc: Peter Xu Cc: Russell King Cc: Thomas Gleixner Signed-off-by: Andrew Morton List of files: /linux/fs/Kconfig

902861e34c401696ed9ad17a54c8790e7e8e3069 - Merge tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Fri, 15 Mar 2024 01:43:30 +0100

Merge tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmPull MM updates from Andrew Morton: - Sumanth Korikkar has taught s390 to allocate hotplug-time page frames from hotplugged memory rather than only from main memory. Series "implement "memmap on memory" feature on s390". - More folio conversions from Matthew Wilcox in the series "Convert memcontrol charge moving to use folios" "mm: convert mm counter to take a folio" - Chengming Zhou has optimized zswap's rbtree locking, providing significant reductions in system time and modest but measurable reductions in overall runtimes. The series is "mm/zswap: optimize the scalability of zswap rb-tree". - Chengming Zhou has also provided the series "mm/zswap: optimize zswap lru list" which provides measurable runtime benefits in some swap-intensive situations. - And Chengming Zhou further optimizes zswap in the series "mm/zswap: optimize for dynamic zswap_pools". Measured improvements are modest. - zswap cleanups and simplifications from Yosry Ahmed in the series "mm: zswap: simplify zswap_swapoff()". - In the series "Add DAX ABI for memmap_on_memory", Vishal Verma has contributed several DAX cleanups as well as adding a sysfs tunable to control the memmap_on_memory setting when the dax device is hotplugged as system memory. - Johannes Weiner has added the large series "mm: zswap: cleanups", which does that. - More DAMON work from SeongJae Park in the series "mm/damon: make DAMON debugfs interface deprecation unignorable" "selftests/damon: add more tests for core functionalities and corner cases" "Docs/mm/damon: misc readability improvements" "mm/damon: let DAMOS feeds and tame/auto-tune itself" - In the series "mm/mempolicy: weighted interleave mempolicy and sysfs extension" Rakie Kim has developed a new mempolicy interleaving policy wherein we allocate memory across nodes in a weighted fashion rather than uniformly. This is beneficial in heterogeneous memory environments appearing with CXL. - Christophe Leroy has contributed some cleanup and consolidation work against the ARM pagetable dumping code in the series "mm: ptdump: Refactor CONFIG_DEBUG_WX and check_wx_pages debugfs attribute". - Luis Chamberlain has added some additional xarray selftesting in the series "test_xarray: advanced API multi-index tests". - Muhammad Usama Anjum has reworked the selftest code to make its human-readable output conform to the TAP ("Test Anything Protocol") format. Amongst other things, this opens up the use of third-party tools to parse and process out selftesting results. - Ryan Roberts has added fork()-time PTE batching of THP ptes in the series "mm/memory: optimize fork() with PTE-mapped THP". Mainly targeted at arm64, this significantly speeds up fork() when the process has a large number of pte-mapped folios. - David Hildenbrand also gets in on the THP pte batching game in his series "mm/memory: optimize unmap/zap with PTE-mapped THP". It implements batching during munmap() and other pte teardown situations. The microbenchmark improvements are nice. - And in the series "Transparent Contiguous PTEs for User Mappings" Ryan Roberts further utilizes arm's pte's contiguous bit ("contpte mappings"). Kernel build times on arm64 improved nicely. Ryan's series "Address some contpte nits" provides some followup work. - In the series "mm/hugetlb: Restore the reservation" Breno Leitao has fixed an obscure hugetlb race which was causing unnecessary page faults. He has also added a reproducer under the selftest code. - In the series "selftests/mm: Output cleanups for the compaction test", Mark Brown did what the title claims. - Kinsey Ho has added the series "mm/mglru: code cleanup and refactoring". - Even more zswap material from Nhat Pham. The series "fix and extend zswap kselftests" does as claimed. - In the series "Introduce cpu_dcache_is_aliasing() to fix DAX regression" Mathieu Desnoyers has cleaned up and fixed rather a mess in our handling of DAX on archiecctures which have virtually aliasing data caches. The arm architecture is the main beneficiary. - Lokesh Gidra's series "per-vma locks in userfaultfd" provides dramatic improvements in worst-case mmap_lock hold times during certain userfaultfd operations. - Some page_owner enhancements and maintenance work from Oscar Salvador in his series "page_owner: print stacks and their outstanding allocations" "page_owner: Fixup and cleanup" - Uladzislau Rezki has contributed some vmalloc scalability improvements in his series "Mitigate a vmap lock contention". It realizes a 12x improvement for a certain microbenchmark. - Some kexec/crash cleanup work from Baoquan He in the series "Split crash out from kexec and clean up related config items". - Some zsmalloc maintenance work from Chengming Zhou in the series "mm/zsmalloc: fix and optimize objects/page migration" "mm/zsmalloc: some cleanup for get/set_zspage_mapping()" - Zi Yan has taught the MM to perform compaction on folios larger than order=0. This a step along the path to implementaton of the merging of large anonymous folios. The series is named "Enable >0 order folio memory compaction". - Christoph Hellwig has done quite a lot of cleanup work in the pagecache writeback code in his series "convert write_cache_pages() to an iterator". - Some modest hugetlb cleanups and speedups in Vishal Moola's series "Handle hugetlb faults under the VMA lock". - Zi Yan has changed the page splitting code so we can split huge pages into sizes other than order-0 to better utilize large folios. The series is named "Split a folio to any lower order folios". - David Hildenbrand has contributed the series "mm: remove total_mapcount()", a cleanup. - Matthew Wilcox has sought to improve the performance of bulk memory freeing in his series "Rearrange batched folio freeing". - Gang Li's series "hugetlb: parallelize hugetlb page init on boot" provides large improvements in bootup times on large machines which are configured to use large numbers of hugetlb pages. - Matthew Wilcox's series "PageFlags cleanups" does that. - Qi Zheng's series "minor fixes and supplement for ptdesc" does that also. S390 is affected. - Cleanups to our pagemap utility functions from Peter Xu in his series "mm/treewide: Replace pXd_large() with pXd_leaf()". - Nico Pache has fixed a few things with our hugepage selftests in his series "selftests/mm: Improve Hugepage Test Handling in MM Selftests". - Also, of course, many singleton patches to many things. Please see the individual changelogs for details.* tag 'mm-stable-2024-03-13-20-04' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (435 commits) mm/zswap: remove the memcpy if acomp is not sleepable crypto: introduce: acomp_is_async to expose if comp drivers might sleep memtest: use {READ,WRITE}_ONCE in memory scanning mm: prohibit the last subpage from reusing the entire large folio mm: recover pud_leaf() definitions in nopmd case selftests/mm: skip the hugetlb-madvise tests on unmet hugepage requirements selftests/mm: skip uffd hugetlb tests with insufficient hugepages selftests/mm: dont fail testsuite due to a lack of hugepages mm/huge_memory: skip invalid debugfs new_order input for folio split mm/huge_memory: check new folio order when split a folio mm, vmscan: retry kswapd's priority loop with cache_trim_mode off on failure mm: add an explicit smp_wmb() to UFFDIO_CONTINUE mm: fix list corruption in put_pages_list mm: remove folio from deferred split list before uncharging it filemap: avoid unnecessary major faults in filemap_fault() mm,page_owner: drop unnecessary check mm,page_owner: check for null stack_record before bumping its refcount mm: swap: fix race between free_swap_and_cache() and swapoff() mm/treewide: align up pXd_leaf() retval across archs mm/treewide: drop pXd_large() ... List of files: /linux/fs/Kconfig

9d9539db8638cfe053fcd1f441746f0e2c8c2d32 - pidfs: remove config option

Tue, 12 Mar 2024 10:39:44 +0100

pidfs: remove config optionAs Linus suggested this enables pidfs unconditionally. A key property toretain is the ability to compare pidfds by inode number (cf. [1]).That's extremely helpful just as comparing namespace file descriptors byinode number is. They are used in a variety of scenarios where they needto be compared, e.g., when receiving a pidfd via SO_PEERPIDFD from asocket to trivially authenticate a the sender and various otheruse-cases.For 64bit systems this is pretty trivial to do. For 32bit it's slightlymore annoying as we discussed but we simply add a dumb ida basedallocator that gets used on 32bit. This gives the same guarantees aboutinode numbers on 64bit without any overflow risk. Practically, we'llnever run into overflow issues because we're constrained by the numberof processes that can exist on 32bit and by the number of open filesthat can exist on a 32bit system. On 64bit none of this matters andthings are very simple.If 32bit also needs the uniqueness guarantee they can simply parse thecontents of /proc//fd/. The uniqueness guarantees have avariety of use-cases. One of the most obvious ones is that they willmake pidfiles (or "pidfdfiles", I guess) reliable as the uniqueidentifier can be placed into there that won't be reycled. Also afrequent request.Note, I took the chance and simplified path_from_stashed() even further.Instead of passing the inode number explicitly to path_from_stashed() welet the filesystem handle that internally. So path_from_stashed() endsup even simpler than it is now. This is also a good solution allowingthe cleanup code to be clean and consistent between 32bit and 64bit. Thecleanup path in prepare_anon_dentry() is also switched around so we putthe inode before the dentry allocation. This means we only have to callthe cleanup handler for the filesystem's inode data once and can rely->evict_inode() otherwise.Aside from having to have a bit of extra code for 32bit it actually endsup a nice cleanup for path_from_stashed() imho.Tested on both 32 and 64bit including error injection.Link: https://github.com/systemd/systemd/pull/31713 [1]Link: https://lore.kernel.org/r/20240312-dingo-sehnlich-b3ecc35c6de7@braunerSigned-off-by: Christian Brauner Signed-off-by: Linus Torvalds List of files: /linux/fs/Kconfig