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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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558 lines
35 KiB
HTML
558 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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font-size: 0.9em;} #content{display: flex; flex-direction: column; flex: 1 1 auto;}
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|
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</head>
|
||
<body id="report-upstream-bugs" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="report-upstream-bugs"><a class="anchor" href="#report-upstream-bugs"></a><a class="link" href="#report-upstream-bugs">26.9. Report upstream bugs</a></h3>
|
||
<div class="paragraph">
|
||
<p>When asking for help on upstream repositories outside of this repository, you will need to provide the commands that you are running in detail without referencing our scripts.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For example, QEMU developers will only want to see the final QEMU command that you are running.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For the configure and build, search for the <code>Building</code> and <code>Configuring</code> parts of the build log, then try to strip down all Buildroot related paths, to keep only options that seem to matter.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We make that easy by building commands as strings, and then echoing them before evaling.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So for example when you run:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --arch arm</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>the very first stdout output of that script is the actual QEMU command that is being run.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The command is also saved to a file for convenience:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cat "$(./getvar --arch arm run_cmd_file)"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which you can manually modify and execute during your experiments later:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>vim "$(./getvar --arch arm run_cmd_file)"
|
||
./"$(./getvar --arch arm run_cmd_file)"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>If you are not already on the master of the given component, you can do that neatly with <a href="build-variants.html">Build variants</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>E.g., to check if a QEMU bug is still present on <code>master</code>, you can do as explained at <a href="qemu-build-variants.html">QEMU build variants</a>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>git -C "$(./getvar qemu_source_dir)" checkout master
|
||
./build-qemu --clean --qemu-build-id master
|
||
./build-qemu --qemu-build-id master
|
||
git -C "$(./getvar qemu_source_dir)" checkout -
|
||
./run --qemu-build-id master</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then, you will also want to do a <a href="bisection.html">Bisection</a> to pinpoint the exact commit to blame, and CC that developer.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Finally, give the images you used save upstream developers' time as shown at: <a href="release-zip.html">Section 38.19.2, “release-zip”</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For Buildroot problems, you should wither provide the config you have:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./getvar buildroot_config_file</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>or try to reproduce with a minimal config, see: <a href="https://github.com/cirosantilli/buildroot/tree/in-tree-package-master" class="bare">https://github.com/cirosantilli/buildroot/tree/in-tree-package-master</a></p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
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|
||
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|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="rpath.html">Buildroot rebuild is slow when the root filesystem is large</a> | ↑ Up: <a href="buildroot.html">Buildroot</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="libc-choice.html">libc choice</a> →</p>
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