Changes in Kconfig

96942092d5e67c71af246fa3bc1422cdf80a5dc9 - vdso/treewide: Drop GENERIC_TIME_VSYSCALL

Tue, 19 May 2026 08:26:17 +0200

vdso/treewide: Drop GENERIC_TIME_VSYSCALLThis Kconfig symbol is not used anymore, remove it.Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://patch.msgid.link/20260519-vdso-generic_time_vsyscal-v1-3-5c2a5905d5f5@linutronix.de List of files: /linux/arch/loongarch/Kconfig

4808e5cc4fe1f40c4d690d0ce5df0f413fb02938 - LoongArch: Make CONFIG_64BIT as the default option

Mon, 04 May 2026 03:00:00 +0200

LoongArch: Make CONFIG_64BIT as the default optionCONFIG_64BIT is the mandatory option before v7.0, but in v7.1-rc1 bothCONFIG_32BIT and CONFIG_64BIT are selectable and CONFIG_32BIT became thedefault option. This breaks existing configurations, so explicitly makeCONFIG_64BIT as the default option to keep existing behavior.Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

ff57d59200baadfdb41f94a49fed7d161a9a8124 - Merge tag 'loongarch-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Fri, 24 Apr 2026 18:54:45 +0200

Merge tag 'loongarch-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongsonPull LoongArch updates from Huacai Chen: - Adjust build infrastructure for 32BIT/64BIT - Add HIGHMEM (PKMAP and FIX_KMAP) support - Show and handle CPU vulnerabilites correctly - Batch the icache maintenance for jump_label - Add more atomic instructions support for BPF JIT - Add more features (e.g. fsession) support for BPF trampoline - Some bug fixes and other small changes* tag 'loongarch-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: (21 commits) selftests/bpf: Enable CAN_USE_LOAD_ACQ_STORE_REL for LoongArch LoongArch: BPF: Add fsession support for trampolines LoongArch: BPF: Introduce emit_store_stack_imm64() helper LoongArch: BPF: Support up to 12 function arguments for trampoline LoongArch: BPF: Support small struct arguments for trampoline LoongArch: BPF: Open code and remove invoke_bpf_mod_ret() LoongArch: BPF: Support load-acquire and store-release instructions LoongArch: BPF: Support 8 and 16 bit read-modify-write instructions LoongArch: BPF: Add the default case in emit_atomic() and rename it LoongArch: Define instruction formats for AM{SWAP/ADD}.{B/H} and DBAR LoongArch: Batch the icache maintenance for jump_label LoongArch: Add flush_icache_all()/local_flush_icache_all() LoongArch: Add spectre boundry for syscall dispatch table LoongArch: Show CPU vulnerabilites correctly LoongArch: Make arch_irq_work_has_interrupt() true only if IPI HW exist LoongArch: Use get_random_canary() for stack canary init LoongArch: Improve the logging of disabling KASLR LoongArch: Align FPU register state to 32 bytes LoongArch: Handle CONFIG_32BIT in syscall_get_arch() LoongArch: Add HIGHMEM (PKMAP and FIX_KMAP) support ... List of files: /linux/arch/loongarch/Kconfig

8b81576c16c0681b0c0148200a8c3ce33ad5f6fa - LoongArch: Add HIGHMEM (PKMAP and FIX_KMAP) support

Wed, 22 Apr 2026 09:44:54 +0200

LoongArch: Add HIGHMEM (PKMAP and FIX_KMAP) supportAdd HIGHMEM (High Memory) support for LoongArch, mostly needed by 32BITkernel because the size of kernel virtual memory space is only 512MB andthe size of usable physical memory is only 256MB in this case.HIGHMEM adds permanent kernel mapping (PKMAP) and fixed kernel mapping(FIX_KMAP), which increase usable physical memory up to 2.25GB (2304MB).We can just use the generic copy_user_highpage(), so remove the customversion.Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

3d9aba6618d115750729bba2d1f8af180bd7d3bd - LoongArch: Adjust build infrastructure for 32BIT/64BIT

Wed, 22 Apr 2026 09:44:26 +0200

LoongArch: Adjust build infrastructure for 32BIT/64BITAdjust build infrastructure (Kconfig, Makefile and ld scripts) to letus enable both 32BIT/64BIT kernel build.Reviewed-by: Arnd Bergmann Signed-off-by: Jiaxun Yang Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

078f80f909ba9fa3060e89dc634ff4b1defc43d3 - mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE

Thu, 19 Mar 2026 09:19:40 +0100

mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVEPatch series "mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE and cleanupCONFIG_MIGRATION".While working on memory hotplug code cleanups, I realized thatCONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE is not really required anymore.Changing that revealed some rather nasty looking CONFIG_MIGRATIONhandling.Let's clean that up by introducing a dedicated CONFIG_NUMA_MIGRATIONoption and reducing the dependencies that CONFIG_MIGRATION has.This patch (of 2):All architectures that select CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE alsoselect CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG. So we can just removeCONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE.For CONFIG_MIGRATION, make it depend on CONFIG_MEMORY_HOTREMOVE instead,and make CONFIG_MEMORY_HOTREMOVE select CONFIG_MIGRATION (just likeCONFIG_CMA and CONFIG_COMPACTION already do).We'll clean up CONFIG_MIGRATION next.Link: https://lkml.kernel.org/r/20260319-config_migration-v1-0-42270124966f@kernel.orgLink: https://lkml.kernel.org/r/20260319-config_migration-v1-1-42270124966f@kernel.orgSigned-off-by: David Hildenbrand (Arm) Acked-by: Zi Yan Reviewed-by: Lorenzo Stoakes (Oracle) Reviewed-by: Joshua Hahn Reviewed-by: Gregory Price Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Jonathan Cameron Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Alistair Popple Cc: "Borislav Petkov (AMD)" Cc: Byungchul Park Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: "Huang, Ying" Cc: Ingo Molnar Cc: Liam Howlett Cc: Madhavan Srinivasan Cc: Matthew Brost Cc: Michael Ellerman Cc: Michal Hocko Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Rakie Kim Cc: Sebastian Andrzej Siewior Cc: Steven Rostedt Cc: Suren Baghdasaryan Cc: Sven Schnelle Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux/arch/loongarch/Kconfig

c8b8f3c50f487b145433a6c3f95efd8790079a06 - LoongArch: Only use SC.Q when supported by the assembler

Mon, 16 Mar 2026 03:36:00 +0100

LoongArch: Only use SC.Q when supported by the assemblerThe 128-bit atomic cmpxchg implementation uses the SC.Q instruction.Older versions of GNU AS do not support that instruction, erroring out:ERROR:root:{standard input}: Assembler messages:{standard input}:4831: Error: no match insn: sc.q $t0,$t1,$r14{standard input}:6407: Error: no match insn: sc.q $t0,$t1,$r23{standard input}:10856: Error: no match insn: sc.q $t0,$t1,$r14make[4]: *** [../scripts/Makefile.build:289: mm/slub.o] Error 1(Binutils 2.41)So test support for SC.Q in Kconfig and disable the atomics if theinstruction is not available.Fixes: f0e4b1b6e295 ("LoongArch: Add 128-bit atomic cmpxchg support")Closes: https://lore.kernel.org/lkml/20260216082834-edc51c46-7b7a-4295-8ea5-4d9a3ca2224f@linutronix.de/Reviewed-by: Xi Ruoyao Acked-by: Hengqi Chen Tested-by: Hengqi Chen Signed-off-by: Thomas Weißschuh Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

64275e9fda3702bfb5ab3b95f7c2b9b414667164 - Merge tag 'loongarch-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Sat, 14 Feb 2026 21:47:15 +0100

Merge tag 'loongarch-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongsonPull LoongArch updates from Huacai Chen: - Select HAVE_CMPXCHG_{LOCAL,DOUBLE} - Add 128-bit atomic cmpxchg support - Add HOTPLUG_SMT implementation - Wire up memfd_secret system call - Fix boot errors and unwind errors for KASAN - Use BPF prog pack allocator and add BPF arena support - Update dts files to add nand controllers - Some bug fixes and other small changes* tag 'loongarch-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: LoongArch: dts: loongson-2k1000: Add nand controller support LoongArch: dts: loongson-2k0500: Add nand controller support LoongArch: BPF: Implement bpf_addr_space_cast instruction LoongArch: BPF: Implement PROBE_MEM32 pseudo instructions LoongArch: BPF: Use BPF prog pack allocator LoongArch: Use IS_ERR_PCPU() macro for KGDB LoongArch: Rework KASAN initialization for PTW-enabled systems LoongArch: Disable instrumentation for setup_ptwalker() LoongArch: Remove some extern variables in source files LoongArch: Guard percpu handler under !CONFIG_PREEMPT_RT LoongArch: Handle percpu handler address for ORC unwinder LoongArch: Use %px to print unmodified unwinding address LoongArch: Prefer top-down allocation after arch_mem_init() LoongArch: Add HOTPLUG_SMT implementation LoongArch: Make cpumask_of_node() robust against NUMA_NO_NODE LoongArch: Wire up memfd_secret system call LoongArch: Replace seq_printf() with seq_puts() for simple strings LoongArch: Add 128-bit atomic cmpxchg support LoongArch: Add detection for SC.Q support LoongArch: Select HAVE_CMPXCHG_LOCAL in Kconfig List of files: /linux/arch/loongarch/Kconfig

4cff5c05e076d2ee4e34122aa956b84a2eaac587 - Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Thu, 12 Feb 2026 20:32:37 +0100

Merge tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmPull MM updates from Andrew Morton: - "powerpc/64s: do not re-activate batched TLB flush" makes arch_{enter|leave}_lazy_mmu_mode() nest properly (Alexander Gordeev) It adds a generic enter/leave layer and switches architectures to use it. Various hacks were removed in the process. - "zram: introduce compressed data writeback" implements data compression for zram writeback (Richard Chang and Sergey Senozhatsky) - "mm: folio_zero_user: clear page ranges" adds clearing of contiguous page ranges for hugepages. Large improvements during demand faulting are demonstrated (David Hildenbrand) - "memcg cleanups" tidies up some memcg code (Chen Ridong) - "mm/damon: introduce {,max_}nr_snapshots and tracepoint for damos stats" improves DAMOS stat's provided information, deterministic control, and readability (SeongJae Park) - "selftests/mm: hugetlb cgroup charging: robustness fixes" fixes a few issues in the hugetlb cgroup charging selftests (Li Wang) - "Fix va_high_addr_switch.sh test failure - again" addresses several issues in the va_high_addr_switch test (Chunyu Hu) - "mm/damon/tests/core-kunit: extend existing test scenarios" improves the KUnit test coverage for DAMON (Shu Anzai) - "mm/khugepaged: fix dirty page handling for MADV_COLLAPSE" fixes a glitch in khugepaged which was causing madvise(MADV_COLLAPSE) to transiently return -EAGAIN (Shivank Garg) - "arch, mm: consolidate hugetlb early reservation" reworks and consolidates a pile of straggly code related to reservation of hugetlb memory from bootmem and creation of CMA areas for hugetlb (Mike Rapoport) - "mm: clean up anon_vma implementation" cleans up the anon_vma implementation in various ways (Lorenzo Stoakes) - "tweaks for __alloc_pages_slowpath()" does a little streamlining of the page allocator's slowpath code (Vlastimil Babka) - "memcg: separate private and public ID namespaces" cleans up the memcg ID code and prevents the internal-only private IDs from being exposed to userspace (Shakeel Butt) - "mm: hugetlb: allocate frozen gigantic folio" cleans up the allocation of frozen folios and avoids some atomic refcount operations (Kefeng Wang) - "mm/damon: advance DAMOS-based LRU sorting" improves DAMOS's movement of memory betewwn the active and inactive LRUs and adds auto-tuning of the ratio-based quotas and of monitoring intervals (SeongJae Park) - "Support page table check on PowerPC" makes CONFIG_PAGE_TABLE_CHECK_ENFORCED work on powerpc (Andrew Donnellan) - "nodemask: align nodes_and{,not} with underlying bitmap ops" makes nodes_and() and nodes_andnot() propagate the return values from the underlying bit operations, enabling some cleanup in calling code (Yury Norov) - "mm/damon: hide kdamond and kdamond_lock from API callers" cleans up some DAMON internal interfaces (SeongJae Park) - "mm/khugepaged: cleanups and scan limit fix" does some cleanup work in khupaged and fixes a scan limit accounting issue (Shivank Garg) - "mm: balloon infrastructure cleanups" goes to town on the balloon infrastructure and its page migration function. Mainly cleanups, also some locking simplification (David Hildenbrand) - "mm/vmscan: add tracepoint and reason for kswapd_failures reset" adds additional tracepoints to the page reclaim code (Jiayuan Chen) - "Replace wq users and add WQ_PERCPU to alloc_workqueue() users" is part of Marco's kernel-wide migration from the legacy workqueue APIs over to the preferred unbound workqueues (Marco Crivellari) - "Various mm kselftests improvements/fixes" provides various unrelated improvements/fixes for the mm kselftests (Kevin Brodsky) - "mm: accelerate gigantic folio allocation" greatly speeds up gigantic folio allocation, mainly by avoiding unnecessary work in pfn_range_valid_contig() (Kefeng Wang) - "selftests/damon: improve leak detection and wss estimation reliability" improves the reliability of two of the DAMON selftests (SeongJae Park) - "mm/damon: cleanup kdamond, damon_call(), damos filter and DAMON_MIN_REGION" does some cleanup work in the core DAMON code (SeongJae Park) - "Docs/mm/damon: update intro, modules, maintainer profile, and misc" performs maintenance work on the DAMON documentation (SeongJae Park) - "mm: add and use vma_assert_stabilised() helper" refactors and cleans up the core VMA code. The main aim here is to be able to use the mmap write lock's lockdep state to perform various assertions regarding the locking which the VMA code requires (Lorenzo Stoakes) - "mm, swap: swap table phase II: unify swapin use" removes some old swap code (swap cache bypassing and swap synchronization) which wasn't working very well. Various other cleanups and simplifications were made. The end result is a 20% speedup in one benchmark (Kairui Song) - "enable PT_RECLAIM on more 64-bit architectures" makes PT_RECLAIM available on 64-bit alpha, loongarch, mips, parisc, and um. Various cleanups were performed along the way (Qi Zheng)* tag 'mm-stable-2026-02-11-19-22' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (325 commits) mm/memory: handle non-split locks correctly in zap_empty_pte_table() mm: move pte table reclaim code to memory.c mm: make PT_RECLAIM depends on MMU_GATHER_RCU_TABLE_FREE mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config um: mm: enable MMU_GATHER_RCU_TABLE_FREE parisc: mm: enable MMU_GATHER_RCU_TABLE_FREE mips: mm: enable MMU_GATHER_RCU_TABLE_FREE LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE alpha: mm: enable MMU_GATHER_RCU_TABLE_FREE mm: change mm/pt_reclaim.c to use asm/tlb.h instead of asm-generic/tlb.h mm/damon/stat: remove __read_mostly from memory_idle_ms_percentiles zsmalloc: make common caches global mm: add SPDX id lines to some mm source files mm/zswap: use %pe to print error pointers mm/vmscan: use %pe to print error pointers mm/readahead: fix typo in comment mm: khugepaged: fix NR_FILE_PAGES and NR_SHMEM in collapse_file() mm: refactor vma_map_pages to use vm_insert_pages mm/damon: unify address range representation with damon_addr_range mm/cma: replace snprintf with strscpy in cma_new_area ... List of files: /linux/arch/loongarch/Kconfig

009ee0c96416ecd0c568af72ee37965e06bde460 - LoongArch: Add HOTPLUG_SMT implementation

Tue, 10 Feb 2026 12:31:13 +0100

LoongArch: Add HOTPLUG_SMT implementationFor benchmarking or debugging purpose, we usually want to control SMTvia boot parameter and sysfs knobs. So add HOTPLUG_SMT implementation.1. Boot parameters:nosmt: Disable SMT, can be enabled via sysfs knobs.nosmt=force: Disable SMT, cannot be enabled via sysfs knobs.2. Runtime sysfs controls:Write "on", "off", "forceoff" or the number of SMT threads (1, 2, ...)to /sys/devices/system/cpu/smt/control.Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

f0e4b1b6e295299f5c9c79ad546dedbdf7132f45 - LoongArch: Add 128-bit atomic cmpxchg support

Tue, 10 Feb 2026 12:31:12 +0100

LoongArch: Add 128-bit atomic cmpxchg supportImplement 128-bit atomic compare-and-exchange using LoongArch'sLL.D/SC.Q instructions.At the same time, this fix the BPF scheduler test failures (scx_centraland scx_qmap) caused by kmalloc_nolock_noprof() returning NULL, due tomissing 128-bit atomics. The NULL returns lead to -ENOMEM errors duringscheduler initialization, causing test cases to fail.Verified by testing with the scx_qmap scheduler(located in tools/sched_ext/).Building with `make` and running ./tools/sched_ext/build/bin/scx_qmap.Link: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=5fb750e8a9aeAcked-by: Hengqi Chen Tested-by: Hengqi Chen Co-developed-by:: Xi Ruoyao Signed-off-by: Xi Ruoyao Signed-off-by: George Guo Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

07d5798aadfa922af1f81bf7fe4a1746a7e6d184 - LoongArch: Select HAVE_CMPXCHG_LOCAL in Kconfig

Tue, 10 Feb 2026 12:31:06 +0100

LoongArch: Select HAVE_CMPXCHG_LOCAL in KconfigLoongArch has already implemented cmpxchg_local(), this_cpu_cmpxchg()and similar functions, so select HAVE_CMPXCHG_LOCAL in Kconfig to avoidincurring the overhead of local_irq_save()/local_irq_restore() for pagestate helpers in mm/vmstat.c.Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

a5b981e63edb5f606f109b39f6ded2a332ec5aed - LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREE

Tue, 27 Jan 2026 13:12:56 +0100

LoongArch: mm: enable MMU_GATHER_RCU_TABLE_FREEOn a 64-bit system, madvise(MADV_DONTNEED) may cause a large number ofempty PTE page table pages (such as 100GB+). To resolve this problem,first enable MMU_GATHER_RCU_TABLE_FREE to prepare for enabling thePT_RECLAIM feature, which resolves this problem.Link: https://lkml.kernel.org/r/bd1b11bc1a13686aeba81a40194f87b369d62661.1769515122.git.zhengqi.arch@bytedance.comSigned-off-by: Qi Zheng Cc: Huacai Chen Cc: WANG Xuerui Cc: Andreas Larsson Cc: "Aneesh Kumar K.V" Cc: Anton Ivanov Cc: Borislav Petkov Cc: Dave Hansen Cc: David Hildenbrand (Red Hat) Cc: Dev Jain Cc: Helge Deller Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Johannes Berg Cc: Lance Yang Cc: "Liam R. Howlett" Cc: Lorenzo Stoakes Cc: Magnus Lindholm Cc: Matt Turner Cc: Michal Hocko Cc: Mike Rapoport Cc: Nicholas Piggin Cc: Peter Zijlstra Cc: Richard Henderson Cc: Richard Weinberger Cc: Suren Baghdasaryan Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vlastimil Babka Cc: Wei Yang Cc: Will Deacon Signed-off-by: Andrew Morton List of files: /linux/arch/loongarch/Kconfig

b8431b901e825222281bbd156ea8ee8dd60b58de - loongarch/paravirt: Use common code for paravirt_steal_clock()

Mon, 05 Jan 2026 12:05:08 +0100

loongarch/paravirt: Use common code for paravirt_steal_clock()Remove the arch specific variant of paravirt_steal_clock() and usethe common one instead.Signed-off-by: Juergen Gross Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Bibo Mao Acked-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260105110520.21356-10-jgross@suse.com List of files: /linux/arch/loongarch/Kconfig

79974cc3ba45f3884e9c18da92a62b198a18ca62 - LoongArch: Add atomic operations for 32BIT/64BIT

Sat, 06 Dec 2025 03:40:32 +0100

LoongArch: Add atomic operations for 32BIT/64BITLoongArch64 has both AMO and LL/SC instructions, while LoongArch32 onlyhas LL/SC intstructions. So we add a Kconfig option CPU_HAS_AMO here andimplement atomic operations (also including local operations and percpuoperations) for both 32BIT and 64BIT platforms.Reviewed-by: Arnd Bergmann Signed-off-by: Jiaxun Yang Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

10eda1c51cbbd7f3f9f1f481b6725105aca4982a - LoongArch: Select HAVE_ARCH_BITREVERSE in Kconfig

Sat, 06 Dec 2025 03:39:39 +0100

LoongArch: Select HAVE_ARCH_BITREVERSE in KconfigWithout HAVE_ARCH_BITREVERSE, the architecture-optimized bit reverseimplementations in arch/loongarch/include/asm/bitrev.h are not used atall.Signed-off-by: Xi Ruoyao Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

fb5bc347311b1d78dc608c91c2d68327b0a1d1d4 - Merge tag 'loongarch-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Mon, 06 Oct 2025 21:18:56 +0200

Merge tag 'loongarch-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongsonPull LoongArch updates from Huacai Chen: - Initialize acpi_gbl_use_global_lock to false - Allow specify SIMD width via kernel parameters - Add kexec_file (both EFI & ELF format) support - Add PER_VMA_LOCK for page fault handling support - Improve BPF trampoline support - Update the default config file - Some bug fixes and other small changes* tag 'loongarch-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson: (23 commits) LoongArch: Update Loongson-3 default config file LoongArch: BPF: Sign-extend struct ops return values properly LoongArch: BPF: Make error handling robust in arch_prepare_bpf_trampoline() LoongArch: BPF: Make trampoline size stable LoongArch: BPF: Don't align trampoline size LoongArch: BPF: No support of struct argument in trampoline programs LoongArch: BPF: No text_poke() for kernel text LoongArch: BPF: Remove duplicated bpf_flush_icache() LoongArch: BPF: Remove duplicated flags check LoongArch: BPF: Fix uninitialized symbol 'retval_off' LoongArch: BPF: Optimize sign-extention mov instructions LoongArch: Handle new atomic instructions for probes LoongArch: Try VMA lock-based page fault handling first LoongArch: Automatically disable kaslr if boot from kexec_file LoongArch: Add crash dump support for kexec_file LoongArch: Add ELF binary support for kexec_file LoongArch: Add EFI binary support for kexec_file LoongArch: Add preparatory infrastructure for kexec_file LoongArch: Add struct loongarch_image_header for kernel LoongArch: Allow specify SIMD width via kernel parameters ... List of files: /linux/arch/loongarch/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/arch/loongarch/Kconfig

892979b0a97c5f3a5decfd6a33e7f902414bfc41 - LoongArch: Try VMA lock-based page fault handling first

Thu, 02 Oct 2025 16:39:19 +0200

LoongArch: Try VMA lock-based page fault handling firstAttempt VMA lock-based page fault handling first, and fall back to theexisting mmap_lock-based handling if that fails.The "ebizzy -mTRp" test on Loongson-3A6000 shows that PER_VMA_LOCK canimprove the benchmark by about 17.9% (97837.7 to 115430.8).This is the LoongArch variant of "x86/mm: try VMA lock-based page faulthandling first".Signed-off-by: Wentao Guan Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig

fc9c112f804abcd984a20a66a909332a147a23e8 - LoongArch: Add ELF binary support for kexec_file

Thu, 02 Oct 2025 16:39:08 +0200

LoongArch: Add ELF binary support for kexec_fileThis patch creates kexec_elf_ops to load ELF binary file forkexec_file_load() syscall.However, for `kbuf->memsz` and `kbuf->buf_min`, special handling isrequired, and the generic `kexec_elf_load()` cannot be used directly.$ readelf -l vmlinux... Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align LOAD 0x0000000000010000 0x9000000000200000 0x9000000000200000 0x0000000002747a00 0x000000000287a0d8 RWE 0x10000 NOTE 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000000 R 0x8phdr->p_paddr should have been a physical address, but it is a virtualaddress on the current LoongArch. This will cause kexec_file to failwhen loading the kernel and need to be converted to a physical address.From the above MemSiz, it can be seen that 0x287a0d8 isn't page aligned.Although kexec_add_buffer() will perform PAGE_SIZE alignment on kbuf->memsz, there is still a stampeding in the loaded kernel space and initrdspace. The initrd resolution failed when starting the second kernel.It can be known from the link script vmlinux.lds.S that, BSS_SECTION(0, SZ_64K, 8) . = ALIGN(PECOFF_SEGMENT_ALIGN);It needs to be aligned according to SZ_64K, so that after alignment, itssize is consistent with _kernel_asize.The basic usage (vmlinux):1) Load second kernel image: # kexec -s -l vmlinux --initrd=initrd.img --reuse-cmdline2) Startup second kernel: # kexec -eSigned-off-by: Youling Tang Signed-off-by: Huacai Chen List of files: /linux/arch/loongarch/Kconfig