linux-kernel - [RFC] Documentation: kbuild: Add description of git for reproducible builds

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Message-Id: <20221020103823.31001-1-ashimida@linux.alibaba.com>
Date:   Thu, 20 Oct 2022 03:38:23 -0700
From:   Dan Li <ashimida@...ux.alibaba.com>
To:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        ndesaulniers@...gle.com, corbet@....net
Cc:     linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Dan Li <ashimida@...ux.alibaba.com>
Subject: [RFC] 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@...ux.alibaba.com>
---
 Documentation/kbuild/reproducible-builds.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/kbuild/reproducible-builds.rst b/Documentation/kbuild/reproducible-builds.rst
index 071f0151a7a4..13397f38c358 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
-- 
2.17.1