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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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578 lines
35 KiB
HTML
578 lines
35 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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</head>
|
||
<body id="modify-kernel-config" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="modify-kernel-config"><a class="anchor" href="#modify-kernel-config"></a><a class="link" href="#modify-kernel-config">17.1.1. Modify kernel config</a></h4>
|
||
<div class="paragraph">
|
||
<p>To modify a single option on top of our <a href="kernel-configs-about.html">default kernel configs</a>, do:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux --config 'CONFIG_FORTIFY_SOURCE=y'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Kernel modules depend on certain kernel configs, and therefore in general you might have to clean and rebuild the kernel modules after changing the kernel config:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-modules --clean
|
||
./build-modules</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and then proceed as in <a href="your-first-kernel-module-hack.html">Your first kernel module hack</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>You might often get way without rebuilding the kernel modules however.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To use an extra kernel config fragment file on top of our defaults, do:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>printf '
|
||
CONFIG_IKCONFIG=y
|
||
CONFIG_IKCONFIG_PROC=y
|
||
' > data/myconfig
|
||
./build-linux --config-fragment 'data/myconfig'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To use just your own exact <code>.config</code> instead of our defaults ones, use:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux --custom-config-file data/myconfig</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>There is also a shortcut <code>--custom-config-file-gem5</code> to use the <a href="gem5-arm-linux-kernel-patches.html">gem5 arm Linux kernel patches</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The following options can all be used together, sorted by decreasing config setting power precedence:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>--config</code></p>
|
||
</li>
|
||
<li>
|
||
<p><code>--config-fragment</code></p>
|
||
</li>
|
||
<li>
|
||
<p><code>--custom-config-file</code></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To do a clean menu config yourself and use that for the build, do:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux --clean
|
||
./build-linux --custom-config-target menuconfig</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>But remember that every new build re-configures the kernel by default, so to keep your configs you will need to use on further builds:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux --no-configure</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So what you likely want to do instead is to save that as a new <code>defconfig</code> and use it later as:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux --no-configure --no-modules-install savedefconfig
|
||
cp "$(./getvar linux_build_dir)/defconfig" data/myconfig
|
||
./build-linux --custom-config-file data/myconfig</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>You can also use other config generating targets such as <code>defconfig</code> with the same method as shown at: <a href="linux-kernel-defconfig.html">Section 17.1.3.1.1, “Linux kernel defconfig”</a>.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>↑ Up: <a href="linux-kernel-configuration.html">Linux kernel configuration</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="find-the-kernel-config.html">Find the kernel config</a> →</p>
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