linux-kernel - [PATCH v2] Documentation: kbuild: note CONFIG_DEBUG

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Message-Id: <20250924-kbuild-doc-config-debug-efi-in-reproducible-builds-v2-1-d2d6b9dcdb7d@kernel.org>
Date: Wed, 24 Sep 2025 21:47:58 +0200
From: Nicolas Schier <nsc@...nel.org>
To: Nathan Chancellor <nathan@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: Ard Biesheuvel <ardb@...nel.org>, Ben Hutchings <ben@...adent.org.uk>, 
 Jonathan Corbet <corbet@....net>, Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Randy Dunlap <rdunlap@...radead.org>, 
 linux-doc@...r.kernel.org, linux-kbuild@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Nicolas Schier <nsc@...nel.org>
Subject: [PATCH v2] Documentation: kbuild: note CONFIG_DEBUG_EFI in
 reproducible builds

From: Masahiro Yamada <masahiroy@...nel.org>

CONFIG_EFI_DEBUG embeds absolute file paths into object files, which
makes the resulting vmlinux specific to the build environment.

Add a note about this in reproducible-builds.rst

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Signed-off-by: Nicolas Schier <nsc@...nel.org>
---
Changes in v2:
  * Fixed a grammar typo (Randy)
  * v1: https://lore.kernel.org/linux-kbuild/20250625125809.2504963-1-masahiroy@kernel.org
---
 Documentation/kbuild/reproducible-builds.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/kbuild/reproducible-builds.rst b/Documentation/kbuild/reproducible-builds.rst
index f2dcc39044e66ddd165646e0b51ccb0209aca7dd..96d208e578cd53d3f0c4a24ec983a9179260345d 100644
--- a/Documentation/kbuild/reproducible-builds.rst
+++ b/Documentation/kbuild/reproducible-builds.rst
@@ -61,6 +61,9 @@ supported.
 The Reproducible Builds web site has more information about these
 `prefix-map options`_.
 
+Some CONFIG options such as `CONFIG_DEBUG_EFI` embed absolute paths in
+object files. Such options should be disabled.
+
 Generated files in source packages
 ----------------------------------
 

---
base-commit: cec1e6e5d1ab33403b809f79cd20d6aff124ccfe
change-id: 20250924-kbuild-doc-config-debug-efi-in-reproducible-builds-eb7489a8d185

Best regards,
-- 
Nicolas