[PATCH] Documentation: kbuild: Add initramfs into reproducible builds document

[PATCH] Documentation: kbuild: Add initramfs into reproducible builds document

[jouni.hogander]

From: Jouni Hogander <jouni.hogander@unikie.com>

Initramfs configuration has impact on build being reproducible

Signed-off-by: Jouni Hogander <jouni.hogander@unikie.com>
---
 Documentation/kbuild/reproducible-builds.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/kbuild/reproducible-builds.rst b/Documentation/kbuild/reproducible-builds.rst
index 3b25655e441b..559700531a48 100644
--- a/Documentation/kbuild/reproducible-builds.rst
+++ b/Documentation/kbuild/reproducible-builds.rst
@@ -119,6 +119,14 @@ 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``.
 
+Initial RAM Filesystem
+----------------------
+
+If ``CONFIG_BLK_DEV_INITRD`` is enabled and ``CONFIG_INITRAMFS_SOURCE``
+doesn't contain gzipped cpio archive, an initramfs is generated during
+build. To avoid this provide gzipped cpio archive via
+``CONFIG_INITRAMFS_SOURCE``
+
 .. _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