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- Remove useless assignment of soft_mode variable The function __ftrace_event_enable_disable() sets "soft_mode" in one of the branch paths but doesn't use it after that. Remove the setting of that variable. - Add a cond_resched() in ring_buffer_resize() The resize function that allocates all the pages for the ring buffer was causing a soft lockup on PREEMPT_NONE configs when allocating large buffers on machines with many CPUs. Hopefully this is the last cond_resched() needed to be added as PREEMPT_LAZY becomes the norm in the future. - Make ftrace_graph_ent depth field signed The "depth" field of struct ftrace_graph_ent was converted from "int" to "unsigned long" for alignment reasons to work with being embedded in other structures. The conversion from a signed to unsigned caused integrity checks to always pass as they were comparing "depth" to less than zero. Make the field signed long. - Add recursion protection to stack trace events A infinite recursion was triggered by a stack trace event calling RCU which internally called rcu_read_unlock_special(), which triggered an event that was also doing stacktraces which cause it to trigger the same RCU lock that called rcu_read_unlock_special() again. Update the trace_test_and_set_recursion() to add a set of context checks for events to use, and have the stack trace event use that for recursion protection. - Make the variable ftrace_dump_on_oops static The cleanup of sysctl that moved all the updates to the files that use them moved the reference of ftrace_dump_on_oops to where it is used. It is no longer used outside of the trace.c file. Make it static. -----BEGIN PGP SIGNATURE----- iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCaV/2wRQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qmMqAQD+LyAOb7bKlgFjwRABjszg1yDhJPb0 gQGSNPchQyq/7gD8Cu3/ze5UxrNV8cNNsbAPu0/xEg4eyozbRiP/VjzZ4gU= =uLUP -----END PGP SIGNATURE----- Merge tag 'trace-v6.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Remove useless assignment of soft_mode variable The function __ftrace_event_enable_disable() sets "soft_mode" in one of the branch paths but doesn't use it after that. Remove the setting of that variable. - Add a cond_resched() in ring_buffer_resize() The resize function that allocates all the pages for the ring buffer was causing a soft lockup on PREEMPT_NONE configs when allocating large buffers on machines with many CPUs. Hopefully this is the last cond_resched() needed to be added as PREEMPT_LAZY becomes the norm in the future. - Make ftrace_graph_ent depth field signed The "depth" field of struct ftrace_graph_ent was converted from "int" to "unsigned long" for alignment reasons to work with being embedded in other structures. The conversion from a signed to unsigned caused integrity checks to always pass as they were comparing "depth" to less than zero. Make the field signed long. - Add recursion protection to stack trace events A infinite recursion was triggered by a stack trace event calling RCU which internally called rcu_read_unlock_special(), which triggered an event that was also doing stacktraces which cause it to trigger the same RCU lock that called rcu_read_unlock_special() again. Update the trace_test_and_set_recursion() to add a set of context checks for events to use, and have the stack trace event use that for recursion protection. - Make the variable ftrace_dump_on_oops static The cleanup of sysctl that moved all the updates to the files that use them moved the reference of ftrace_dump_on_oops to where it is used. It is no longer used outside of the trace.c file. Make it static. * tag 'trace-v6.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: trace: ftrace_dump_on_oops[] is not exported, make it static tracing: Add recursion protection in kernel stack trace recording ftrace: Make ftrace_graph_ent depth field signed ring-buffer: Avoid softlockup in ring_buffer_resize() during memory free tracing: Drop unneeded assignment to soft_mode
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 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 Communication and Support ========================= * Mailing Lists: https://lore.kernel.org/ * IRC: #kernelnewbies on irc.oftc.net * Bugzilla: https://bugzilla.kernel.org/ * MAINTAINERS file: Lists subsystem maintainers and mailing lists * Email Clients: Documentation/process/email-clients.rst