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Feng Jiang says: ==================== bpf, riscv: add timed may_goto support This series adds RISC-V JIT support for the timed may_goto loop bound. Patch 1 implements arch_bpf_timed_may_goto() and enables bpf_jit_supports_timed_may_goto() so the verifier uses the timed expansion path. Patch 2 adds a test that checks R0-R5 are preserved across arch_bpf_timed_may_goto() calls. Patch 3 enables the verifier_may_goto_1, stream_cond_break, and may_goto_interaction fastcall tests on riscv64. Tested on riscv64 QEMU (rva23s64): may_goto programs load and JIT correctly, and the 250ms timeout path works as expected. Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn> Tested-by: Pu Lehui <pulehui@huawei.com> Reviewed-by: Björn Töpel <bjorn@kernel.org> Acked-by: Björn Töpel <bjorn@kernel.org> --- Changes in v5: - Use REG_S/REG_L/SZREG in arch_bpf_timed_may_goto assembly. (Pu Lehui) - Add __arch_s390x to the timed_may_goto_preserves_regs test. (Pu Lehui) - Switch the preserves-regs test to SEC("syscall") to fix bpf_prog_test_run() EINVAL. - Link to v4: https://lore.kernel.org/r/20260722-riscv-bpf-timed-may-goto-v4-0-e117e6337bc7@kylinos.cn Changes in v4: - Add 'bpf-next' prefix to match the BPF kernel tree workflow. - Add a test checking that R0-R5 are preserved across arch_bpf_timed_may_goto() calls. Use bpf_get_prandom_u32() to prevent the verifier from removing the checks via DCE. - Rename may_goto_interaction_arm64() to may_goto_interaction(). - Wrap the arch_bpf_timed_may_goto address check to a single line. - Link to v3: https://lore.kernel.org/r/20260715-riscv-bpf-timed-may-goto-v3-0-cf2a9c3d843f@kylinos.cn Changes in v3: - Set up the frame pointer in arch_bpf_timed_may_goto() so the function does not break stack unwinding under CONFIG_FRAME_POINTER. Changes in v2: - Fix BPF_REG_0 being clobbered after arch_bpf_timed_may_goto() calls. - Enable the may_goto_interaction fastcall test on riscv64. --- ==================== Link: https://patch.msgid.link/20260723-riscv-bpf-timed-may-goto-v5-0-86acb54e5642@kylinos.cn Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. Quick Start ----------- * Report a bug: See Documentation/admin-guide/reporting-issues.rst * Get the latest kernel: https://kernel.org * Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst * Join the community: https://lore.kernel.org/ Essential Documentation ----------------------- All users should be familiar with: * Building requirements: Documentation/process/changes.rst * Code of Conduct: Documentation/process/code-of-conduct.rst * License: See COPYING Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/ Who Are You? ============ Find your role below: * New Kernel Developer - Getting started with kernel development * Academic Researcher - Studying kernel internals and architecture * Security Expert - Hardening and vulnerability analysis * Backport/Maintenance Engineer - Maintaining stable kernels * System Administrator - Configuring and troubleshooting * Maintainer - Leading subsystems and reviewing patches * Hardware Vendor - Writing drivers for new hardware * Distribution Maintainer - Packaging kernels for distros * AI Coding Assistant - LLMs and AI-powered development tools For Specific Users ================== New Kernel Developer -------------------- Welcome! Start your kernel development journey here: * Getting Started: Documentation/process/development-process.rst * Your First Patch: Documentation/process/submitting-patches.rst * Coding Style: Documentation/process/coding-style.rst * Build System: Documentation/kbuild/index.rst * Development Tools: Documentation/dev-tools/index.rst * Kernel Hacking Guide: Documentation/kernel-hacking/hacking.rst * Core APIs: Documentation/core-api/index.rst Academic Researcher ------------------- Explore the kernel's architecture and internals: * Researcher Guidelines: Documentation/process/researcher-guidelines.rst * Memory Management: Documentation/mm/index.rst * Scheduler: Documentation/scheduler/index.rst * Networking Stack: Documentation/networking/index.rst * Filesystems: Documentation/filesystems/index.rst * RCU (Read-Copy Update): Documentation/RCU/index.rst * Locking Primitives: Documentation/locking/index.rst * Power Management: Documentation/power/index.rst Security Expert --------------- Security documentation and hardening guides: * Security Documentation: Documentation/security/index.rst * LSM Development: Documentation/security/lsm-development.rst * Self Protection: Documentation/security/self-protection.rst * Reporting Vulnerabilities: Documentation/process/security-bugs.rst * CVE Procedures: Documentation/process/cve.rst * Embargoed Hardware Issues: Documentation/process/embargoed-hardware-issues.rst * Security Features: Documentation/userspace-api/seccomp_filter.rst Backport/Maintenance Engineer ----------------------------- Maintain and stabilize kernel versions: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * Backporting Guide: Documentation/process/backporting.rst * Applying Patches: Documentation/process/applying-patches.rst * Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git for Maintainers: Documentation/maintainer/configure-git.rst System Administrator -------------------- Configure, tune, and troubleshoot Linux systems: * Admin Guide: Documentation/admin-guide/index.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst * Tracing/Debugging: Documentation/trace/index.rst * Performance Security: Documentation/admin-guide/perf-security.rst * Hardware Monitoring: Documentation/hwmon/index.rst Maintainer ---------- Lead kernel subsystems and manage contributions: * Maintainer Handbook: Documentation/maintainer/index.rst * Pull Requests: Documentation/maintainer/pull-requests.rst * Managing Patches: Documentation/maintainer/modifying-patches.rst * Rebasing and Merging: Documentation/maintainer/rebasing-and-merging.rst * Development Process: Documentation/process/maintainer-handbooks.rst * Maintainer Entry Profile: Documentation/maintainer/maintainer-entry-profile.rst * Git Configuration: Documentation/maintainer/configure-git.rst Hardware Vendor --------------- Write drivers and support new hardware: * Driver API Guide: Documentation/driver-api/index.rst * Driver Model: Documentation/driver-api/driver-model/driver.rst * Device Drivers: Documentation/driver-api/infrastructure.rst * Bus Types: Documentation/driver-api/driver-model/bus.rst * Device Tree Bindings: Documentation/devicetree/bindings/ * Power Management: Documentation/driver-api/pm/index.rst * DMA API: Documentation/core-api/dma-api.rst Distribution Maintainer ----------------------- Package and distribute the kernel: * Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst * ABI Documentation: Documentation/ABI/README * Kernel Configuration: Documentation/kbuild/kconfig.rst * Module Signing: Documentation/admin-guide/module-signing.rst * Kernel Parameters: Documentation/admin-guide/kernel-parameters.rst * Tainted Kernels: Documentation/admin-guide/tainted-kernels.rst AI Coding Assistant ------------------- CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and follow the AI coding assistants documentation before contributing to the Linux kernel: * Documentation/process/coding-assistants.rst This documentation contains essential requirements about licensing, attribution, and the Developer Certificate of Origin that all AI tools must comply with. 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