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Documentation: kbuild: Add description of git for reproducible builds

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The status of git will affect the final compilation result, add it to
the documentation of reproducible builds.

Signed-off-by: Dan Li <ashimida@linux.alibaba.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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Dan Li 2022-10-20 03:38:23 -07:00 committed by Masahiro Yamada
parent 5c1df62ca6
commit 114ff6fe6c
1 changed files with 10 additions and 0 deletions
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10
Documentation/kbuild/reproducible-builds.rst
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@ -119,6 +119,16 @@ To avoid this, you can make the vDSO different for different
kernel versions by including an arbitrary string of "salt" in it. kernel versions by including an arbitrary string of "salt" in it.
This is specified by the Kconfig symbol ``CONFIG_BUILD_SALT``. This is specified by the Kconfig symbol ``CONFIG_BUILD_SALT``.
Git
---
Uncommitted changes or different commit ids in git can also lead
to different compilation results. For example, after executing
``git reset HEAD^``, even if the code is the same, the
``include/config/kernel.release`` generated during compilation
will be different, which will eventually lead to binary differences.
See ``scripts/setlocalversion`` for details.
.. _KBUILD_BUILD_TIMESTAMP: kbuild.html#kbuild-build-timestamp .. _KBUILD_BUILD_TIMESTAMP: kbuild.html#kbuild-build-timestamp
.. _KBUILD_BUILD_USER and KBUILD_BUILD_HOST: kbuild.html#kbuild-build-user-kbuild-build-host .. _KBUILD_BUILD_USER and KBUILD_BUILD_HOST: kbuild.html#kbuild-build-user-kbuild-build-host
.. _KCFLAGS: kbuild.html#kcflags .. _KCFLAGS: kbuild.html#kcflags