kernel/linux.git/arch/powerpc/lib, branch v7.2-rc1

powerpc: Remove arch-specific strncpy() implementation

2026-06-18T23:37:13+00:00

strncpy() has no remaining callers in the kernel[1]. Remove the powerpc-specific assembly implementation from both the kernel (arch/powerpc/lib/string.S) and the boot wrapper (arch/powerpc/boot/string.S), along with the __HAVE_ARCH_STRNCPY define and declaration, falling back to the generic version in lib/string.c. The boot wrapper's strncpy had no callers in arch/powerpc/boot/. Link: https://github.com/KSPP/linux/issues/90 [1] Signed-off-by: Kees Cook

Merge tag 'arm64-upstream' of gitolite.kernel.org:pub/scm/linux/kernel/git/arm64/linux

2026-06-15T23:48:04+00:00

Pull arm64 updates from Will Deacon: "It feels like the new world of AI tooling has slowed us down a little on the feature side when compared to the fixes side. The extra rounds of Sashiko review have also pushed a few things out until next time. Still, there's some good foundational stuff here for the fpsimd code and hardening work towards removing the predictable linear alias of the kernel image. CPU errata handling: - Extend CnP disabling workaround to HiSilicon HIP09 hardware. - Work around eternally broken broadcast TLB invalidation on more CPUs. - Documentation and code cleanups. CPU features: - Add new hwcaps for the 2025 dpISA extensions. Floating point / SVE / SME: - Significant cleanup to the low-level state management code in the core architecture code and KVM. - Use correct register widths during SVE/SME save/restore assembly. - Expose SVE/SME save/restore memory accesses to sanitisers. Memory management: - Preparatory work for unmapping the kernel data and bss sections from the linear map. Miscellaneous: - Inline DAIF manipulation helpers so they can be used safely from non-instrumentable code. - Fix handling of the 'nosmp' cmdline option to avoid marking secondary cores as "possible". MPAM: - Add support for v0.1 of the MPAM architecture. Perf: - Update HiSilicon PMU MAINTAINERS entry. - Fix event encodings for the DVM node in the CMN driver. Selftests: - Extend sigframe tests to cover POE context. - Add coverage for the newly added 2025 dpISA hwcaps. System registers: - Add new registers and ESR encodings for the HDBSS feature. Plus minor fixes and cleanups across the board" * tag 'arm64-upstream' of gitolite.kernel.org:pub/scm/linux/kernel/git/arm64/linux: (73 commits) arm64: errata: Mitigate TLBI errata on Microsoft Azure Cobalt 100 CPU arm64: errata: Mitigate TLBI errata on NVIDIA Olympus CPU arm64: errata: Mitigate TLBI errata on various Arm CPUs arm64: cputype: Add C1-Premium definitions arm64: cputype: Add C1-Ultra definitions Revert "arm64: mm: Unmap kernel data/bss entirely from the linear map" Revert "arm64: mm: Defer remap of linear alias of data/bss" arm64: arch_timer: reuse arch_timer_read_cnt{p,v}ct_el0() helpers arm64/mm: Rename ptdesc_t arm64: mm: Defer remap of linear alias of data/bss KVM: arm64: Omit tag sync on stage-2 mappings of the zero page arm64: Avoid double evaluation of __ptep_get() kasan: Move generic KASAN page tables out of BSS too arm64: Rename page table BSS section to .bss..pgtbl arm64: patching: replace min_t with min in __text_poke perf/arm-cmn: Fix DVM node events arm64: fpsimd: Remove arm64: fpsimd: Move SME save/restore inline arm64: fpsimd: Move sve_flush_live() inline arm64: fpsimd: Move SVE save/restore inline ...

powerpc/code-patching: Avoid r/w mapping of the zero page

2026-06-02T15:29:16+00:00

The only remaining use of map_patch_area() is mapping the zero page, and immediately unmapping it again so that the intermediate page table levels are all guaranteed to be populated. The use of the zero page here is completely arbitrary, and not harmful per se, but currently, it creates a writable mapping, and does so in a manner that requires that the empty_zero_page[] symbol is not const-qualified. Given that this is about to change, and that map_patch_area() now never maps anything other than the zero page, let's simplify the code and - remove the helpers and call [un]map_kernel_page() directly - take the PA of empty_zero_page directly - create a read-only temporary mapping. This allows empty_zero_page[] to be repainted as const u8[] in a subsequent patch, without making substantial changes to this code patching logic. Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy (CS GROUP) Link: https://lore.kernel.org/all/20260520085423.485402-1-ardb@kernel.org/ Signed-off-by: Ard Biesheuvel Signed-off-by: Will Deacon

powerpc/vmx: avoid KASAN instrumentation in enter_vmx_ops() for kexec

2026-05-06T02:01:28+00:00

The kexec sequence invokes enter_vmx_ops() via copy_page() with the MMU disabled. In this context, code must not rely on normal virtual address translations or trigger page faults. With KASAN enabled, functions get instrumented and may access shadow memory using regular address translation. When executed with the MMU off, this can lead to page faults (bad_page_fault) from which the kernel cannot recover in the kexec path, resulting in a hang. The kexec path sets preempt_count to HARDIRQ_OFFSET before entering the MMU-off copy sequence. current_thread_info()->preempt_count = HARDIRQ_OFFSET kexec_sequence(..., copy_with_mmu_off = 1) -> kexec_copy_flush(image) copy_segments() -> copy_page(dest, addr) bl enter_vmx_ops() if (in_interrupt()) return 0 beq .Lnonvmx_copy Since kexec sets preempt_count to HARDIRQ_OFFSET, in_interrupt() evaluates to true and enter_vmx_ops() returns early. As in_interrupt() (and preempt_count()) are always inlined, mark enter_vmx_ops() with __no_sanitize_address to avoid KASAN instrumentation and shadow memory access with MMU disabled, helping kexec boot fine with KASAN enabled. Reported-by: Aboorva Devarajan Reviewed-by: Aboorva Devarajan Tested-by: Aboorva Devarajan Reviewed-by: Ritesh Harjani (IBM) Signed-off-by: Sourabh Jain Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20260407124349.1698552-2-sourabhjain@linux.ibm.com

Merge tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-04-17T03:11:56+00:00

Pull non-MM updates from Andrew Morton: - "pid: make sub-init creation retryable" (Oleg Nesterov) Make creation of init in a new namespace more robust by clearing away some historical cruft which is no longer needed. Also some documentation fixups - "selftests/fchmodat2: Error handling and general" (Mark Brown) Fix and a cleanup for the fchmodat2() syscall selftest - "lib: polynomial: Move to math/ and clean up" (Andy Shevchenko) - "hung_task: Provide runtime reset interface for hung task detector" (Aaron Tomlin) Give administrators the ability to zero out /proc/sys/kernel/hung_task_detect_count - "tools/getdelays: use the static UAPI headers from tools/include/uapi" (Thomas Weißschuh) Teach getdelays to use the in-kernel UAPI headers rather than the system-provided ones - "watchdog/hardlockup: Improvements to hardlockup" (Mayank Rungta) Several cleanups and fixups to the hardlockup detector code and its documentation - "lib/bch: fix undefined behavior from signed left-shifts" (Josh Law) A couple of small/theoretical fixes in the bch code - "ocfs2/dlm: fix two bugs in dlm_match_regions()" (Junrui Luo) - "cleanup the RAID5 XOR library" (Christoph Hellwig) A quite far-reaching cleanup to this code. I can't do better than to quote Christoph: "The XOR library used for the RAID5 parity is a bit of a mess right now. The main file sits in crypto/ despite not being cryptography and not using the crypto API, with the generic implementations sitting in include/asm-generic and the arch implementations sitting in an asm/ header in theory. The latter doesn't work for many cases, so architectures often build the code directly into the core kernel, or create another module for the architecture code. Change this to a single module in lib/ that also contains the architecture optimizations, similar to the library work Eric Biggers has done for the CRC and crypto libraries later. After that it changes to better calling conventions that allow for smarter architecture implementations (although none is contained here yet), and uses static_call to avoid indirection function call overhead" - "lib/list_sort: Clean up list_sort() scheduling workarounds" (Kuan-Wei Chiu) Clean up this library code by removing a hacky thing which was added for UBIFS, which UBIFS doesn't actually need - "Fix bugs in extract_iter_to_sg()" (Christian Ehrhardt) Fix a few bugs in the scatterlist code, add in-kernel tests for the now-fixed bugs and fix a leak in the test itself - "kdump: Enable LUKS-encrypted dump target support in ARM64 and PowerPC" (Coiby Xu) Enable support of the LUKS-encrypted device dump target on arm64 and powerpc - "ocfs2: consolidate extent list validation into block read callbacks" (Joseph Qi) Cleanup, simplify, and make more robust ocfs2's validation of extent list fields (Kernel test robot loves mounting corrupted fs images!) * tag 'mm-nonmm-stable-2026-04-15-04-20' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (127 commits) ocfs2: validate group add input before caching ocfs2: validate bg_bits during freefrag scan ocfs2: fix listxattr handling when the buffer is full doc: watchdog: fix typos etc update Sean's email address ocfs2: use get_random_u32() where appropriate ocfs2: split transactions in dio completion to avoid credit exhaustion ocfs2: remove redundant l_next_free_rec check in __ocfs2_find_path() ocfs2: validate extent block list fields during block read ocfs2: remove empty extent list check in ocfs2_dx_dir_lookup_rec() ocfs2: validate dx_root extent list fields during block read ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY ocfs2: handle invalid dinode in ocfs2_group_extend .get_maintainer.ignore: add Askar ocfs2: validate bg_list extent bounds in discontig groups checkpatch: exclude forward declarations of const structs tools/accounting: handle truncated taskstats netlink messages taskstats: set version in TGID exit notifications ocfs2/heartbeat: fix slot mapping rollback leaks on error paths arm64,ppc64le/kdump: pass dm-crypt keys to kdump kernel ...

Merge tag 'powerpc-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2026-04-15T00:10:15+00:00

Pull powerpc updates from Madhavan Srinivasan: - powerpc support for huge pfnmaps - Cleanups to use masked user access - Rework pnv_ioda_pick_m64_pe() to use better bitmap API - Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC - Backup region offset update to eflcorehdr - Fixes for wii/ps3 platform - Implement JIT support for private stack in powerpc - Implement JIT support for fsession in powerpc64 trampoline - Add support for instruction array and indirect jump in powerpc - Misc selftest fixes and cleanups Thanks to Abhishek Dubey, Aditya Gupta, Alex Williamson, Amit Machhiwal, Andrew Donnellan, Bartosz Golaszewski, Cédric Le Goater, Chen Ni, Christophe Leroy (CS GROUP), Hari Bathini, J. Neuschäfer, Mukesh Kumar Chaurasiya (IBM), Nam Cao, Nilay Shroff, Pavithra Prakash, Randy Dunlap, Ritesh Harjani (IBM), Shrikanth Hegde, Sourabh Jain, Vaibhav Jain, Venkat Rao Bagalkote, and Yury Norov (NVIDIA) * tag 'powerpc-7.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (47 commits) mailmap: Add entry for Andrew Donnellan powerpc32/bpf: fix loading fsession func metadata using PPC_LI32 selftest/bpf: Enable gotox tests for powerpc64 powerpc64/bpf: Add support for indirect jump selftest/bpf: Enable instruction array test for powerpc powerpc/bpf: Add support for instruction array powerpc32/bpf: Add fsession support powerpc64/bpf: Implement fsession support selftests/bpf: Enable private stack tests for powerpc64 powerpc64/bpf: Implement JIT support for private stack powerpc: pci-ioda: Optimize pnv_ioda_pick_m64_pe() powerpc: pci-ioda: use bitmap_alloc() in pnv_ioda_pick_m64_pe() powerpc/net: Inline checksum wrappers and convert to scoped user access powerpc/sstep: Convert to scoped user access powerpc/align: Convert emulate_spe() to scoped user access powerpc/ptrace: Convert gpr32_set_common_user() to scoped user access powerpc/futex: Use masked user access powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC cpuidle: powerpc: avoid double clear when breaking snooze powerpc/ps3: spu.c: fix enum and Return kernel-doc warnings ...

Merge branch 'nocache-cleanup'

2026-04-13T15:39:51+00:00

This series cleans up some of the special user copy functions naming and semantics. In particular, get rid of the (very traditional) double underscore names and behavior: the whole "optimize away the range check" model has been largely excised from the other user accessors because it's so subtle and can be unsafe, but also because it's just not a relevant optimization any more. To do that, a couple of drivers that misused the "user" copies as kernel copies in order to get non-temporal stores had to be fixed up, but that kind of code should never have been allowed anyway. The x86-only "nocache" version was also renamed to more accurately reflect what it actually does. This was all done because I looked at this code due to a report by Jann Horn, and I just couldn't stand the inconsistent naming, the horrible semantics, and the random misuse of these functions. This code should probably be cleaned up further, but it's at least slightly closer to normal semantics. I had a more intrusive series that went even further in trying to normalize the semantics, but that ended up hitting so many other inconsistencies between different architectures in this area (eg 'size_t' vs 'unsigned long' vs 'int' as size arguments, and various iovec check differences that Vasily Gorbik pointed out) that I ended up with this more limited version that fixed the worst of the issues. Reported-by: Jann Horn Tested-by: Will Deacon Link: https://lore.kernel.org/all/CAHk-=wgg1QVWNWG-UCFo1hx0zqrPnB3qhPzUTrWNft+MtXQXig@mail.gmail.com/ * nocache-cleanup: x86-64/arm64/powerpc: clean up and rename __copy_from_user_flushcache x86: rename and clean up __copy_from_user_inatomic_nocache() x86-64: rename misleadingly named '__copy_user_nocache()' function

powerpc: move the XOR code to lib/raid/

2026-04-03T06:36:18+00:00

Move the optimized XOR into lib/raid and include it it in xor.ko instead of always building it into the main kernel image. Link: https://lkml.kernel.org/r/20260327061704.3707577-16-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Eric Biggers Tested-by: Eric Biggers Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andreas Larsson Cc: Anton Ivanov Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: "Borislav Petkov (AMD)" Cc: Catalin Marinas Cc: Chris Mason Cc: Christian Borntraeger Cc: Dan Williams Cc: David S. Miller Cc: David Sterba Cc: Heiko Carstens Cc: Herbert Xu Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Jason A. Donenfeld Cc: Johannes Berg Cc: Li Nan Cc: Madhavan Srinivasan Cc: Magnus Lindholm Cc: Matt Turner Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Richard Henderson Cc: Richard Weinberger Cc: Russell King Cc: Song Liu Cc: Sven Schnelle Cc: Ted Ts'o Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton

powerpc/net: Inline checksum wrappers and convert to scoped user access

2026-04-01T03:51:07+00:00

Commit 861574d51bbd ("powerpc/uaccess: Implement masked user access") provides optimised user access by avoiding the cost of access_ok(). Convert csum_and_copy_to_user() and csum_and_copy_from_user() to scoped user access to benefit from masked user access. csum_and_copy_to_user() and csum_and_copy_from_user() are only called respectively by csum_and_copy_to_iter() and csum_and_copy_from_iter_full() and they are only called twice. Those functions used to be large but they were first reduced by commit c693cc4676a0 ("saner calling conventions for csum_and_copy_..._user()") then commit 70d65cd555c5 ("ppc: propagate the calling conventions change down to csum_partial_copy_generic()"). With the additional size reduction provided by conversion to scoped user access they are not worth being kept out of line. $ ./scripts/bloat-o-meter vmlinux.0 vmlinux.1 add/remove: 0/2 grow/shrink: 2/0 up/down: 136/-176 (-40) Function old new delta csum_and_copy_to_iter 2416 2488 +72 csum_and_copy_from_iter_full 2272 2336 +64 csum_and_copy_to_user 88 - -88 csum_and_copy_from_user 88 - -88 Total: Before=11514471, After=11514431, chg -0.00% Signed-off-by: Christophe Leroy (CS GROUP) Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/f44e1b2760dbed35b237040001a91bc8304b726b.1773137098.git.chleroy@kernel.org

powerpc/sstep: Convert to scoped user access

2026-04-01T03:51:07+00:00

Commit 861574d51bbd ("powerpc/uaccess: Implement masked user access") provides optimised user access by avoiding the cost of access_ok(). Convert single step emulation functions to scoped user access to benefit from masked user access. Scoped user access also make the code simpler. Signed-off-by: Christophe Leroy (CS GROUP) Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/8f2d85bddacff18046096dc255fd94f6a0f8b230.1773137010.git.chleroy@kernel.org