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docs: quickly-build-trimmed-linux: various small fixes and improvements

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* improve the short description of localmodconfig in the step-by-step
  guide while fixing its broken first sentence

* briefly mention immutable Linux distributions

* use '--shallow-exclude=v6.0' throughout the document

* instead of "git reset --hard; git checkout ..." use "git checkout
  --force ..." in the step-by-step guide: this matches the TLDR and is
  one command less to execute. This led to a few small adjustments to
  the text and the flow in the surrounding area.

* fix two thinkos in the section explaining full git clones

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/6f4684b9a5d11d3adb04e0af3cfc60db8b28eeb2.1684140700.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Thorsten Leemhuis 2023-05-15 10:52:19 +02:00 committed by Jonathan Corbet
parent 96e3cc270d
commit 0d8aa3212e
1 changed files with 27 additions and 22 deletions
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49
Documentation/admin-guide/quickly-build-trimmed-linux.rst
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@ -215,12 +215,14 @@ again.
reduce the compile time enormously, especially if you are running an reduce the compile time enormously, especially if you are running an
universal kernel from a commodity Linux distribution. universal kernel from a commodity Linux distribution.
There is a catch: the make target 'localmodconfig' will disable kernel There is a catch: 'localmodconfig' is likely to disable kernel features you
features you have not directly or indirectly through some program utilized did not use since you booted your Linux -- like drivers for currently
since you booted the system. You can reduce or nearly eliminate that risk by disconnected peripherals or a virtualization software not haven't used yet.
using tricks outlined in the reference section; for quick testing purposes You can reduce or nearly eliminate that risk with tricks the reference
that risk is often negligible, but it is an aspect you want to keep in mind section outlines; but when building a kernel just for quick testing purposes
in case your kernel behaves oddly. it is often negligible if such features are missing. But you should keep that
aspect in mind when using a kernel built with this make target, as it might
be the reason why something you only use occasionally stopped working.
[:ref:`details<configuration>`] [:ref:`details<configuration>`]
@ -271,6 +273,9 @@ again.
does nothing at all; in that case you have to manually install your kernel, does nothing at all; in that case you have to manually install your kernel,
as outlined in the reference section. as outlined in the reference section.
If you are running a immutable Linux distribution, check its documentation
and the web to find out how to install your own kernel there.
[:ref:`details<install>`] [:ref:`details<install>`]
.. _another_sbs: .. _another_sbs:
@ -291,29 +296,29 @@ again.
version you care about, as git otherwise might retrieve the entire commit version you care about, as git otherwise might retrieve the entire commit
history:: history::
git fetch --shallow-exclude=v6.1 origin git fetch --shallow-exclude=v6.0 origin
If you modified the sources (for example by applying a patch), you now need Now switch to the version you are interested in -- but be aware the command
to discard those modifications; that's because git otherwise will not be able used here will discard any modifications you performed, as they would
to switch to the sources of another version due to potential conflicting conflict with the sources you want to checkout::
changes::
git reset --hard git checkout --force --detach origin/master
Now checkout the version you are interested in, as explained above::
git checkout --detach origin/master
At this point you might want to patch the sources again or set/modify a build At this point you might want to patch the sources again or set/modify a build
tag, as explained earlier; afterwards adjust the build configuration to the tag, as explained earlier. Afterwards adjust the build configuration to the
new codebase and build your next kernel:: new codebase using olddefconfig, which will now adjust the configuration file
you prepared earlier using localmodconfig (~/linux/.config) for your next
kernel::
# reminder: if you want to apply patches, do it at this point # reminder: if you want to apply patches, do it at this point
# reminder: you might want to update your build tag at this point # reminder: you might want to update your build tag at this point
make olddefconfig make olddefconfig
Now build your kernel::
make -j $(nproc --all) make -j $(nproc --all)
Install the kernel as outlined above:: Afterwards install the kernel as outlined above::
command -v installkernel && sudo make modules_install install command -v installkernel && sudo make modules_install install
@ -584,11 +589,11 @@ versions and individual commits at hand at any time::
curl -L \ curl -L \
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/clone.bundle \ https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/clone.bundle \
-o linux-stable.git.bundle -o linux-stable.git.bundle
git clone clone.bundle ~/linux/ git clone linux-stable.git.bundle ~/linux/
rm linux-stable.git.bundle rm linux-stable.git.bundle
cd ~/linux/ cd ~/linux/
git remote set-url origin git remote set-url origin \
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
git fetch origin git fetch origin
git checkout --detach origin/master git checkout --detach origin/master