kernel.git/arch/arm/Kconfig, branch linux-rolling-stable

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux

2025-12-10T22:50:48Z

Pull ARM updates from Russell King: - disable jump label and high PTE for PREEMPT RT kernels - fix input operand modification in load_unaligned_zeropad() - fix hash_name() / fault path induced warnings - fix branch predictor hardening * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux: ARM: fix branch predictor hardening ARM: fix hash_name() fault ARM: allow __do_kernel_fault() to report execution of memory faults ARM: group is_permission_fault() with is_translation_fault() ARM: 9464/1: fix input-only operand modification in load_unaligned_zeropad() ARM: 9461/1: Disable HIGHPTE on PREEMPT_RT kernels ARM: 9459/1: Disable jump-label on PREEMPT_RT

ARM: 9461/1: Disable HIGHPTE on PREEMPT_RT kernels

2025-12-02T11:47:53Z

gup_pgd_range() is invoked with disabled interrupts and invokes __kmap_local_page_prot() via pte_offset_map(), gup_p4d_range(). With HIGHPTE enabled, __kmap_local_page_prot() invokes kmap_high_get() which uses a spinlock_t via lock_kmap_any(). This leads to an sleeping-while-atomic error on PREEMPT_RT because spinlock_t becomes a sleeping lock and must not be acquired in atomic context. The loop in map_new_virtual() uses wait_queue_head_t for wake up which also is using a spinlock_t. Since HIGHPTE is rarely needed at all, turn it off for PREEMPT_RT to allow the use of get_user_pages_fast(). [arnd: rework patch to turn off HIGHPTE instead of HAVE_PAST_GUP] Co-developed-by: Arnd Bergmann Acked-by: Linus Walleij Reviewed-by: Arnd Bergmann Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Russell King (Oracle)

ARM: 9459/1: Disable jump-label on PREEMPT_RT

2025-12-02T11:44:55Z

jump-labels are used to efficiently switch between two possible code paths. To achieve this, stop_machine() is used to keep the CPU in a known state while the opcode is modified. The usage of stop_machine() here leads to large latency spikes which can be observed on PREEMPT_RT. Jump labels may change the target during runtime and are not restricted to debug or "configuration/ setup" part of a PREEMPT_RT system where high latencies could be defined as acceptable. On 64-bit Arm, it is possible to use jump labels without the stop_machine() call, which architecturally provides a way to atomically change one 32-bit instruction word while keeping maintaining consistency, but this is not generally the case on 32-bit, in particular in thumb2 mode. Disable jump-label support on a PREEMPT_RT system when SMP is enabled. [bigeasy: Patch description.] [arnd: add !SMP case, extend changelog] Signed-off-by: Thomas Gleixner Cc: Mark Rutland Cc: Ard Biesheuvel Signed-off-by: Arnd Bergmann Reviewed-by: Linus Walleij Acked-by: Ard Biesheuvel Acked-by: Linus Walleij Reviewed-by: Arnd Bergmann Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Russell King (Oracle)

treewide: drop outdated compiler version remarks in Kconfig help texts

2025-11-12T18:00:14Z

As of writing, Documentation/Changes states the minimal versions of GNU C being 8.1, Clang being 15.0.0 and binutils being 2.30. A few Kconfig help texts are pointing out that specific GCC and Clang versions are needed, but by now, those pointers to versions, such later than 4.0, later than 4.4, or clang later than 5.0, are obsolete and unlikely to be found by users configuring their kernel builds anyway. Drop these outdated remarks in Kconfig help texts referring to older compiler and binutils versions. No functional change. Link: https://lkml.kernel.org/r/20251010082138.185752-1-lukas.bulwahn@redhat.com Signed-off-by: Lukas Bulwahn Cc: Bill Wendling Cc: Justin Stitt Cc: Nathan Chancellor Cc: Russel King Signed-off-by: Andrew Morton

ARM: Select ARCH_USES_CFI_GENERIC_LLVM_PASS

2025-10-30T03:04:55Z

Prior to clang 22.0.0 [1], ARM did not have an architecture specific kCFI bundle lowering in the backend, which may cause issues. Select CONFIG_ARCH_USES_CFI_GENERIC_LLVM_PASS to enable use of __nocfi_generic. Link: https://github.com/llvm/llvm-project/commit/d130f402642fba3d065aacb506cb061c899558de [1] Link: https://github.com/ClangBuiltLinux/linux/issues/2124 Signed-off-by: Nathan Chancellor Link: https://patch.msgid.link/20251025-idpf-fix-arm-kcfi-build-error-v1-2-ec57221153ae@kernel.org Signed-off-by: Kees Cook

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux

2025-10-07T23:20:19Z

Pull ARM development updates from Russell King: - Use string choices helpers - Add support for HAVE_FUNCTION_GRAPH_FREGS * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux: ARM: 9457/1: ftrace: Implement HAVE_FUNCTION_GRAPH_FREGS ARM: 9456/1: mm: fault: use string choices helper ARM: 9454/1: kernel: bios32: use string choices helper ARM: 9451/1: mm: l2x0: use string choices helper

ARM: 9457/1: ftrace: Implement HAVE_FUNCTION_GRAPH_FREGS

2025-10-02T07:44:51Z

Enable support for ftrace's funcgraph-retval feature by capturing r0-r3 and fp. Since ARM does not provide its own __arch_ftrace_regs structure, we instead populate pt_regs with the registers required by ftrace. Cc: Donglin Peng Signed-off-by: Richard Weinberger Signed-off-by: Russell King (Oracle)

Merge tag 'kbuild-6.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

2025-10-02T03:58:51Z

Pull Kbuild updates from Nathan Chancellor: - Extend modules.builtin.modinfo to include module aliases from MODULE_DEVICE_TABLE for builtin modules so that userspace tools (such as kmod) can verify that a particular module alias will be handled by a builtin module - Bump the minimum version of LLVM for building the kernel to 15.0.0 - Upgrade several userspace API checks in headers_check.pl to errors - Unify and consolidate CONFIG_WERROR / W=e handling - Turn assembler and linker warnings into errors with CONFIG_WERROR / W=e - Respect CONFIG_WERROR / W=e when building userspace programs (userprogs) - Enable -Werror unconditionally when building host programs (hostprogs) - Support copy_file_range() and data segment alignment in gen_init_cpio to improve performance on filesystems that support reflinks such as btrfs and XFS - Miscellaneous small changes to scripts and configuration files * tag 'kbuild-6.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (47 commits) modpost: Initialize builtin_modname to stop SIGSEGVs Documentation: kbuild: note CONFIG_DEBUG_EFI in reproducible builds kbuild: vmlinux.unstripped should always depend on .vmlinux.export.o modpost: Create modalias for builtin modules modpost: Add modname to mod_device_table alias scsi: Always define blogic_pci_tbl structure kbuild: extract modules.builtin.modinfo from vmlinux.unstripped kbuild: keep .modinfo section in vmlinux.unstripped kbuild: always create intermediate vmlinux.unstripped s390: vmlinux.lds.S: Reorder sections KMSAN: Remove tautological checks objtool: Drop noinstr hack for KCSAN_WEAK_MEMORY lib/Kconfig.debug: Drop CLANG_VERSION check from DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT riscv: Remove ld.lld version checks from many TOOLCHAIN_HAS configs riscv: Unconditionally use linker relaxation riscv: Remove version check for LTO_CLANG selects powerpc: Drop unnecessary initializations in __copy_inst_from_kernel_nofault() mips: Unconditionally select ARCH_HAS_CURRENT_STACK_POINTER arm64: Remove tautological LLVM Kconfig conditions ARM: Clean up definition of ARM_HAS_GROUP_RELOCS ...

Merge tag 'soc-arm-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

2025-10-02T00:41:15Z

Pull ARM SoC updates from Arnd Bergmann: "The at91 power management code and the TI AM33 platform each get a few updates for robustness, the other changes are just minor cleanups" * tag 'soc-arm-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: ARM: versatile: clock: convert from round_rate() to determine_rate() ARM: rockchip: remove REGULATOR conditional to PM ARM: at91: pm: Remove 2.5V regulator ARM: OMAP2+: clock: convert from round_rate() to determine_rate() ARM: OMAP1: clock: convert from round_rate() to determine_rate() ARM: mach-hpe: Rework support and directory structure arm: omap2: use string choices helper ARM: OMAP2+: pm33xx-core: ix device node reference leaks in amx3_idle_init ARM: OMAP2+: use IS_ERR_OR_NULL() helper ARM: AM33xx: Implement TI advisory 1.0.36 (EMU0/EMU1 pins state on reset) ARM: at91: pm: save and restore ACR during PLL disable/enable ARM: at91: pm: fix MCKx restore routine ARM: at91: pm: fix .uhp_udp_mask specification for current SoCs ARM: shmobile: rcar-gen2: Use SZ_256K definition

Merge tag 'sched-core-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-09-30T17:35:11Z

Pull scheduler updates from Ingo Molnar: "Core scheduler changes: - Make migrate_{en,dis}able() inline, to improve performance (Menglong Dong) - Move STDL_INIT() functions out-of-line (Peter Zijlstra) - Unify the SCHED_{SMT,CLUSTER,MC} Kconfig (Peter Zijlstra) Fair scheduling: - Defer throttling to when tasks exit to user-space, to reduce the chance & impact of throttle-preemption with held locks and other resources (Aaron Lu, Valentin Schneider) - Get rid of sched_domains_curr_level hack for tl->cpumask(), as the warning was getting triggered on certain topologies (Peter Zijlstra) Misc cleanups & fixes: - Header cleanups (Menglong Dong) - Fix race in push_dl_task() (Harshit Agarwal)" * tag 'sched-core-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched: Fix some typos in include/linux/preempt.h sched: Make migrate_{en,dis}able() inline rcu: Replace preempt.h with sched.h in include/linux/rcupdate.h arch: Add the macro COMPILE_OFFSETS to all the asm-offsets.c sched/fair: Do not balance task to a throttled cfs_rq sched/fair: Do not special case tasks in throttled hierarchy sched/fair: update_cfs_group() for throttled cfs_rqs sched/fair: Propagate load for throttled cfs_rq sched/fair: Get rid of throttled_lb_pair() sched/fair: Task based throttle time accounting sched/fair: Switch to task based throttle model sched/fair: Implement throttle task work and related helpers sched/fair: Add related data structure for task based throttle sched: Unify the SCHED_{SMT,CLUSTER,MC} Kconfig sched: Move STDL_INIT() functions out-of-line sched/fair: Get rid of sched_domains_curr_level hack for tl->cpumask() sched/deadline: Fix race in push_dl_task()