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linux-kernel-modules

Use when writing loadable kernel modules: Kbuild, module parameters, proc and sysfs entries, char devices, or ftrace debugging. Not for driver architecture: use device-drivers.

.devin/skills/linux-kernel-modules/SKILL.md

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# Linux kernel modules

A loadable module runs in kernel space with no safety net. The build system, the userspace interfaces, and the debugging paths are all prescribed; follow them and the module stays debuggable.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task writes or builds an out-of-tree `.ko`, adds module parameters, creates proc or sysfs entries, registers a char device, debugs with KDB or ftrace, or signs modules for Secure Boot. |
| Authority | Reversible local: writes only the module source, Kbuild files, built artifacts, and local signing keys, plus load and unload of the module on this machine; rollback is `rmmod` for the loaded module and version control for the files. No remote mutation. |
| Side effect | Local build outputs, module insertion and removal, entries under `/proc` and `/sys` while loaded, and generated key material when signing is set up. |
| Done | The module builds against the running kernel's build tree, loads, exposes its interfaces, and unloads without leaving state behind. |

## Inputs