laptop-kernel/Documentation/core-api, branch master

module: Rename EXPORT_SYMBOL_GPL_FOR_MODULES to EXPORT_SYMBOL_FOR_MODULES

2025-08-11T14:16:36Z

Christoph suggested that the explicit _GPL_ can be dropped from the module namespace export macro, as it's intended for in-tree modules only. It would be possible to restrict it technically, but it was pointed out [2] that some cases of using an out-of-tree build of an in-tree module with the same name are legitimate. But in that case those also have to be GPL anyway so it's unnecessary to spell it out in the macro name. Link: https://lore.kernel.org/all/aFleJN_fE-RbSoFD@infradead.org/ [1] Link: https://lore.kernel.org/all/CAK7LNATRkZHwJGpojCnvdiaoDnP%2BaeUXgdey5sb_8muzdWTMkA@mail.gmail.com/ [2] Suggested-by: Christoph Hellwig Reviewed-by: Shivank Garg Acked-by: David Hildenbrand Acked-by: Nicolas Schier Reviewed-by: Daniel Gomez Reviewed-by: Christian Brauner Signed-off-by: Vlastimil Babka Link: https://lore.kernel.org/20250808-export_modules-v4-1-426945bcc5e1@suse.cz Signed-off-by: Christian Brauner

Merge tag 'mm-stable-2025-08-03-12-35' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-08-05T13:02:07Z

Pull more MM updates from Andrew Morton: "Significant patch series in this pull request: - "mseal cleanups" (Lorenzo Stoakes) Some mseal cleaning with no intended functional change. - "Optimizations for khugepaged" (David Hildenbrand) Improve khugepaged throughput by batching PTE operations for large folios. This gain is mainly for arm64. - "x86: enable EXECMEM_ROX_CACHE for ftrace and kprobes" (Mike Rapoport) A bugfix, additional debug code and cleanups to the execmem code. - "mm/shmem, swap: bugfix and improvement of mTHP swap in" (Kairui Song) Bugfixes, cleanups and performance improvememnts to the mTHP swapin code" * tag 'mm-stable-2025-08-03-12-35' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (38 commits) mm: mempool: fix crash in mempool_free() for zero-minimum pools mm: correct type for vmalloc vm_flags fields mm/shmem, swap: fix major fault counting mm/shmem, swap: rework swap entry and index calculation for large swapin mm/shmem, swap: simplify swapin path and result handling mm/shmem, swap: never use swap cache and readahead for SWP_SYNCHRONOUS_IO mm/shmem, swap: tidy up swap entry splitting mm/shmem, swap: tidy up THP swapin checks mm/shmem, swap: avoid redundant Xarray lookup during swapin x86/ftrace: enable EXECMEM_ROX_CACHE for ftrace allocations x86/kprobes: enable EXECMEM_ROX_CACHE for kprobes allocations execmem: drop writable parameter from execmem_fill_trapping_insns() execmem: add fallback for failures in vmalloc(VM_ALLOW_HUGE_VMAP) execmem: move execmem_force_rw() and execmem_restore_rox() before use execmem: rework execmem_cache_free() execmem: introduce execmem_alloc_rw() execmem: drop unused execmem_update_copy() mm: fix a UAF when vma->mm is freed after vma->vm_refcnt got dropped mm/rmap: add anon_vma lifetime debug check mm: remove mm/io-mapping.c ...

mm: remove mm/io-mapping.c

2025-08-02T19:06:10Z

This is dead code, which was used from commit b739f125e4eb ("i915: use io_mapping_map_user") but reverted a month later by commit 0e4fe0c9f2f9 ("Revert "i915: use io_mapping_map_user"") back in 2021. Since then nobody has used it, so remove it. [akpm@linux-foundation.org: update Documentation/core-api/mm-api.rst, per Vlastimil] Link: https://lkml.kernel.org/r/20250725142901.81502-1-lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Acked-by: David Hildenbrand Acked-by: Vlastimil Babka Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton

Merge tag 'wq-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2025-07-31T22:40:22Z

Pull workqueue updates from Tejun Heo: - Prepare for defaulting to unbound workqueue. A separate branch was created to ease pulling in from other trees but none of the conversions have landed yet - Memory allocation profiling support added - Misc changes * tag 'wq-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: workqueue: Use atomic_try_cmpxchg_relaxed() in tryinc_node_nr_active() workqueue: Remove unused work_on_cpu_safe workqueue: Add new WQ_PERCPU flag workqueue: Add system_percpu_wq and system_dfl_wq workqueue: Basic memory allocation profiling support workqueue: fix opencoded cpumask_next_and_wrap() in wq_select_unbound_cpu()

Merge tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-07-31T21:57:54Z

Pull MM updates from Andrew Morton: "As usual, many cleanups. The below blurbiage describes 42 patchsets. 21 of those are partially or fully cleanup work. "cleans up", "cleanup", "maintainability", "rationalizes", etc. I never knew the MM code was so dirty. "mm: ksm: prevent KSM from breaking merging of new VMAs" (Lorenzo Stoakes) addresses an issue with KSM's PR_SET_MEMORY_MERGE mode: newly mapped VMAs were not eligible for merging with existing adjacent VMAs. "mm/damon: introduce DAMON_STAT for simple and practical access monitoring" (SeongJae Park) adds a new kernel module which simplifies the setup and usage of DAMON in production environments. "stop passing a writeback_control to swap/shmem writeout" (Christoph Hellwig) is a cleanup to the writeback code which removes a couple of pointers from struct writeback_control. "drivers/base/node.c: optimization and cleanups" (Donet Tom) contains largely uncorrelated cleanups to the NUMA node setup and management code. "mm: userfaultfd: assorted fixes and cleanups" (Tal Zussman) does some maintenance work on the userfaultfd code. "Readahead tweaks for larger folios" (Ryan Roberts) implements some tuneups for pagecache readahead when it is reading into order>0 folios. "selftests/mm: Tweaks to the cow test" (Mark Brown) provides some cleanups and consistency improvements to the selftests code. "Optimize mremap() for large folios" (Dev Jain) does that. A 37% reduction in execution time was measured in a memset+mremap+munmap microbenchmark. "Remove zero_user()" (Matthew Wilcox) expunges zero_user() in favor of the more modern memzero_page(). "mm/huge_memory: vmf_insert_folio_*() and vmf_insert_pfn_pud() fixes" (David Hildenbrand) addresses some warts which David noticed in the huge page code. These were not known to be causing any issues at this time. "mm/damon: use alloc_migrate_target() for DAMOS_MIGRATE_{HOT,COLD" (SeongJae Park) provides some cleanup and consolidation work in DAMON. "use vm_flags_t consistently" (Lorenzo Stoakes) uses vm_flags_t in places where we were inappropriately using other types. "mm/memfd: Reserve hugetlb folios before allocation" (Vivek Kasireddy) increases the reliability of large page allocation in the memfd code. "mm: Remove pXX_devmap page table bit and pfn_t type" (Alistair Popple) removes several now-unneeded PFN_* flags. "mm/damon: decouple sysfs from core" (SeongJae Park) implememnts some cleanup and maintainability work in the DAMON sysfs layer. "madvise cleanup" (Lorenzo Stoakes) does quite a lot of cleanup/maintenance work in the madvise() code. "madvise anon_name cleanups" (Vlastimil Babka) provides additional cleanups on top or Lorenzo's effort. "Implement numa node notifier" (Oscar Salvador) creates a standalone notifier for NUMA node memory state changes. Previously these were lumped under the more general memory on/offline notifier. "Make MIGRATE_ISOLATE a standalone bit" (Zi Yan) cleans up the pageblock isolation code and fixes a potential issue which doesn't seem to cause any problems in practice. "selftests/damon: add python and drgn based DAMON sysfs functionality tests" (SeongJae Park) adds additional drgn- and python-based DAMON selftests which are more comprehensive than the existing selftest suite. "Misc rework on hugetlb faulting path" (Oscar Salvador) fixes a rather obscure deadlock in the hugetlb fault code and follows that fix with a series of cleanups. "cma: factor out allocation logic from __cma_declare_contiguous_nid" (Mike Rapoport) rationalizes and cleans up the highmem-specific code in the CMA allocator. "mm/migration: rework movable_ops page migration (part 1)" (David Hildenbrand) provides cleanups and future-preparedness to the migration code. "mm/damon: add trace events for auto-tuned monitoring intervals and DAMOS quota" (SeongJae Park) adds some tracepoints to some DAMON auto-tuning code. "mm/damon: fix misc bugs in DAMON modules" (SeongJae Park) does that. "mm/damon: misc cleanups" (SeongJae Park) also does what it claims. "mm: folio_pte_batch() improvements" (David Hildenbrand) cleans up the large folio PTE batching code. "mm/damon/vaddr: Allow interleaving in migrate_{hot,cold} actions" (SeongJae Park) facilitates dynamic alteration of DAMON's inter-node allocation policy. "Remove unmap_and_put_page()" (Vishal Moola) provides a couple of page->folio conversions. "mm: per-node proactive reclaim" (Davidlohr Bueso) implements a per-node control of proactive reclaim - beyond the current memcg-based implementation. "mm/damon: remove damon_callback" (SeongJae Park) replaces the damon_callback interface with a more general and powerful damon_call()+damos_walk() interface. "mm/mremap: permit mremap() move of multiple VMAs" (Lorenzo Stoakes) implements a number of mremap cleanups (of course) in preparation for adding new mremap() functionality: newly permit the remapping of multiple VMAs when the user is specifying MREMAP_FIXED. It still excludes some specialized situations where this cannot be performed reliably. "drop hugetlb_free_pgd_range()" (Anthony Yznaga) switches some sparc hugetlb code over to the generic version and removes the thus-unneeded hugetlb_free_pgd_range(). "mm/damon/sysfs: support periodic and automated stats update" (SeongJae Park) augments the present userspace-requested update of DAMON sysfs monitoring files. Automatic update is now provided, along with a tunable to control the update interval. "Some randome fixes and cleanups to swapfile" (Kemeng Shi) does what is claims. "mm: introduce snapshot_page" (Luiz Capitulino and David Hildenbrand) provides (and uses) a means by which debug-style functions can grab a copy of a pageframe and inspect it locklessly without tripping over the races inherent in operating on the live pageframe directly. "use per-vma locks for /proc/pid/maps reads" (Suren Baghdasaryan) addresses the large contention issues which can be triggered by reads from that procfs file. Latencies are reduced by more than half in some situations. The series also introduces several new selftests for the /proc/pid/maps interface. "__folio_split() clean up" (Zi Yan) cleans up __folio_split()! "Optimize mprotect() for large folios" (Dev Jain) provides some quite large (>3x) speedups to mprotect() when dealing with large folios. "selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));" and some cleanup" (wang lian) does some cleanup work in the selftests code. "tools/testing: expand mremap testing" (Lorenzo Stoakes) extends the mremap() selftest in several ways, including adding more checking of Lorenzo's recently added "permit mremap() move of multiple VMAs" feature. "selftests/damon/sysfs.py: test all parameters" (SeongJae Park) extends the DAMON sysfs interface selftest so that it tests all possible user-requested parameters. Rather than the present minimal subset" * tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (370 commits) MAINTAINERS: add missing headers to mempory policy & migration section MAINTAINERS: add missing file to cgroup section MAINTAINERS: add MM MISC section, add missing files to MISC and CORE MAINTAINERS: add missing zsmalloc file MAINTAINERS: add missing files to page alloc section MAINTAINERS: add missing shrinker files MAINTAINERS: move memremap.[ch] to hotplug section MAINTAINERS: add missing mm_slot.h file THP section MAINTAINERS: add missing interval_tree.c to memory mapping section MAINTAINERS: add missing percpu-internal.h file to per-cpu section mm/page_alloc: remove trace_mm_alloc_contig_migrate_range_info() selftests/damon: introduce _common.sh to host shared function selftests/damon/sysfs.py: test runtime reduction of DAMON parameters selftests/damon/sysfs.py: test non-default parameters runtime commit selftests/damon/sysfs.py: generalize DAMON context commit assertion selftests/damon/sysfs.py: generalize monitoring attributes commit assertion selftests/damon/sysfs.py: generalize DAMOS schemes commit assertion selftests/damon/sysfs.py: test DAMOS filters commitment selftests/damon/sysfs.py: generalize DAMOS scheme commit assertion selftests/damon/sysfs.py: test DAMOS destinations commitment ...

Merge tag 'docs-6.17' of git://git.lwn.net/linux

2025-07-31T15:36:51Z

Pull documentation updates from Jonathan Corbet: "It has been a relatively busy cycle for docs, especially the build system: - The Perl kernel-doc script was added to 2.3.52pre1 just after the turn of the millennium. Over the following 25 years, it accumulated a vast amount of cruft, all in a language few people want to deal with anymore. Mauro's Python replacement in 6.16 faithfully reproduced all of the cruft in the hope of avoiding regressions. Now that we have a more reasonable code base, though, we can work on cleaning it up; many of the changes this time around are toward that end. - A reorganization of the ext4 docs into the usual TOC format. - Various Chinese translations and updates. - A new script from Mauro to help with docs-build testing. - A new document for linked lists - A sweep through MAINTAINERS fixing broken GitHub git:// repository links. ...and lots of fixes and updates" * tag 'docs-6.17' of git://git.lwn.net/linux: (147 commits) scripts: add origin commit identification based on specific patterns sphinx: kernel_abi: fix performance regression with O= Documentation: core-api: entry: Replace deprecated KVM entry/exit functions docs: fault-injection: drop reference to md-faulty docs: document linked lists scripts: kdoc: make it backward-compatible with Python 3.7 docs: kernel-doc: emit warnings for ancient versions of Python Documentation/rtla: Describe exit status Documentation/rtla: Add include common_appendix.rst docs: kernel: Clarify printk_ratelimit_burst reset behavior Documentation: ioctl-number: Don't repeat macro names Documentation: ioctl-number: Shorten macros table Documentation: ioctl-number: Correct full path to papr-physical-attestation.h Documentation: ioctl-number: Extend "Include File" column width Documentation: ioctl-number: Fix linuxppc-dev mailto link overlayfs.rst: fix typos docs: kdoc: emit a warning for ancient versions of Python docs: kdoc: clean up check_sections() docs: kdoc: directly access the always-there KdocItem fields docs: kdoc: straighten up dump_declaration() ...

Documentation: core-api: entry: Replace deprecated KVM entry/exit functions

2025-07-24T14:32:59Z

The x86-specific functions kvm_guest_{enter,exit}_irqoff() were removed and replaced by the generic guest_state_{enter,exit}_irqoff() in commit ef9989afda73 ("kvm: add guest_state_{enter,exit}_irqoff()") and commit b2d2af7e5df3 ("kvm/x86: rework guest entry logic"). Update the references in the entry/exit handling documentation. Cc: Thomas Gleixner Cc: Nicolas Saenz Julienne Cc: Mark Rutland Signed-off-by: Andrew Donnellan Reviewed-by: Thomas Gleixner Acked-by: Mark Rutland Signed-off-by: Jonathan Corbet Link: https://lore.kernel.org/r/20250723075134.105132-1-ajd@linux.ibm.com

docs: document linked lists

2025-07-17T22:55:53Z

Add example-driven documentation for the kernel's generic linked list data structure. This includes discussion of situations where linked lists are likely inappropriate, and references to further reading. Signed-off-by: Nicolas Frattaroli Link: https://lore.kernel.org/r/20250714-linked-list-docs-v3-1-56c461580866@collabora.com Signed-off-by: Jonathan Corbet

Documentation: core-api: entry: Fix typo "systcalls" -> "syscalls"

2025-07-15T19:28:50Z

Fix a typo: "systcalls" should be "syscalls". Cc: Thomas Gleixner Cc: Nicolas Saenz Julienne Signed-off-by: Andrew Donnellan Signed-off-by: Jonathan Corbet Link: https://lore.kernel.org/r/20250715061529.56268-1-ajd@linux.ibm.com

mm,memory_hotplug: drop status_change_nid parameter from memory_notify

2025-07-13T23:38:17Z

There no users left of status_change_nid, so drop it from memory_notify struct. Link: https://lkml.kernel.org/r/20250616135158.450136-12-osalvador@suse.de Signed-off-by: Oscar Salvador Suggested-by: David Hildenbrand Acked-by: David Hildenbrand Reviewed-by: Vlastimil Babka Cc: Harry Yoo Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Joanthan Cameron Cc: Rakie Kim Signed-off-by: Andrew Morton