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authorDan Li <ashimida@linux.alibaba.com>2022-10-20 03:38:23 -0700
committerMasahiro Yamada <masahiroy@kernel.org>2022-10-28 00:16:29 +0900
commit114ff6fe6cfbe81659f9e517d0b25f53db5dfc5d (patch)
treed51a81f85b587b7affb2fc34f358fe6ce7bc8c6d /Documentation/kbuild
parent5c1df62ca65936139a4b008561110d9fc285c58a (diff)
Documentation: kbuild: Add description of git for reproducible builds
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>
Diffstat (limited to 'Documentation/kbuild')
-rw-r--r--Documentation/kbuild/reproducible-builds.rst10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/kbuild/reproducible-builds.rst b/Documentation/kbuild/reproducible-builds.rst
index 071f0151a7a4..f2dcc39044e6 100644
--- a/Documentation/kbuild/reproducible-builds.rst
+++ b/Documentation/kbuild/reproducible-builds.rst
@@ -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.
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_USER and KBUILD_BUILD_HOST: kbuild.html#kbuild-build-user-kbuild-build-host
.. _KCFLAGS: kbuild.html#kcflags