feat: linux kernel modules quick 'n' dirty article

knowledge base/linux kernel modules.md

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+# Linux kernel modules
+
+## Table of contents <!-- omit in toc -->
+
+1. [TL:DR](#tldr)
+1. [Permanent modules configuration](#permanent-modules-configuration)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL:DR
+
+```sh
+# Show what kernel modules are currently loaded.
+lsmod
+
+# Show information about a module.
+modinfo 'module_name'
+
+# List the options set for loaded modules.
+systool -v -m 'module_name'
+
+# Show the comprehensive configuration of modules.
+modprobe -c
+modprobe -c | grep 'module_name'
+
+# List the dependencies of modules or aliases.
+# Includes the module itself.
+modprobe --show-depends 'module_name'
+
+# Load modules.
+modprobe 'module_name'
+modprobe 'module_name' 'parameter_1=value' 'parameter_n=value'
+
+# Load modules by file name.
+# For those not installed in "/usr/lib/modules/$(uname -r)/".
+insmod 'file_name' 'arg_1' 'arg_n'
+
+# Unload modules.
+modprobe -r 'module_name'
+rmmod 'module_name'
+```
+
+## Permanent modules configuration
+
+Write the options in a `.conf` file in `/etc/modprobe.d/`:
+
+```conf
+# /etc/modprobe.d/raspi-wifi-workaround.conf
+options brcmfmac roamoff=1 feature_disable=0x82000
+```
+
+## Further readings
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- The [Kernel module] page in the [Arch wiki]
+
+<!-- project's references -->
+
+<!-- internal references -->
+[further readings]: #further-readings
+
+<!-- external references -->
+[arch wiki]: https://wiki.archlinux.org
+[kernel module]: https://wiki.archlinux.org/title/Kernel_module