mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 02:05:57 +01:00
254c8bf42e
Semi automated conversion, in part because Pandoc is kind of buggy for adoc:
Some of the commands were along the lines:
for f in *.md; do pandoc --atx-headers --base-header-level=3 -o ${f%.md}.adoc --wrap=none $f; done
sed -Ei '/\[\[.*\]\]/d' *.adoc
while read -r f; do cat $f; echo; done <f >g
77 lines
2.1 KiB
Plaintext
77 lines
2.1 KiB
Plaintext
=== Maintainers
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==== How to update the Linux kernel?
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....
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# Last point before out patches.
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last_mainline_revision=v4.14
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next_mainline_revision=v4.15
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cd linux
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# Create a branch before the rebase.
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git branch "lkmc-${last_mainline_revision}"
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git remote set-url origin git@github.com:cirosantilli/linux.git
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git push
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git remote add up git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
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git fetch up
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git rebase --onto "$next_mainline_revision" "$last_mainline_revision"
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./build -t linux-reconfigure
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# Manually fix our kernel modules if necessary.
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cd ..
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git branch "buildroot-2017.08-linux-${last_mainline_revision}"
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git add .
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git commit -m "Linux ${next_mainline_revision}"
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git push
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....
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and update the README!
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During update all you kernel modules may break since the kernel API is not stable.
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They are usually trivial breaks of things moving around headers or to sub-structs.
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The userland, however, should simply not break, as Linus enforces strict backwards compatibility of userland interfaces.
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This backwards compatibility is just awesome, it makes getting and running the latest master painless.
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This also makes this repo the perfect setup to develop the Linux kernel.
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==== How to downgrade the Linux kernel?
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The kernel is not forward compatible, however, so downgrading the Linux kernel requires downgrading the userland too to the latest Buildroot branch that supports it.
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The default Linux kernel version is bumped in Buildroot with commit messages of type:
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....
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linux: bump default to version 4.9.6
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....
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So you can try:
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....
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git log --grep 'linux: bump default to version'
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....
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Those commits change `BR2_LINUX_KERNEL_LATEST_VERSION` in `/linux/Config.in`.
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You should then look up if there is a branch that supports that kernel. Staying on branches is a good idea as they will get backports, in particular ones that fix the build as newer host versions come out.
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==== How to add new Buildroot options?
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....
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cd buildroot/output.x86_64~
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make menuconfig
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....
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Hit `/` and search for the settings.
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Save and quit.
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....
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diff .config.olg .config
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....
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Copy and paste the diff additions to `buildroot_config_fragment`.
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