linux-kernel - [PATCH v6 6/8] kbuild: Allow adding modules into the FIT ramdisk

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Message-ID: <20251119181333.991099-7-sjg@chromium.org>
Date: Wed, 19 Nov 2025 11:13:27 -0700
From: Simon Glass <sjg@...omium.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Tom Rini <trini@...sulko.com>,
	Ahmad Fatoum <a.fatoum@...gutronix.de>,
	J . Neuschäfer <j.ne@...teo.net>,
	Nicolas Schier <nicolas@...sle.eu>,
	Chen-Yu Tsai <wenst@...omium.org>,
	Simon Glass <sjg@...omium.org>,
	"Reviewed-by : Nicolas Schier" <nsc@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Rong Xu <xur@...gle.com>,
	Tamir Duberstein <tamird@...il.com>,
	Will Deacon <will@...nel.org>,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 6/8] kbuild: Allow adding modules into the FIT ramdisk

Support 'make image.fit FIT_MODULES=1' to put all the modules into a
ramdisk image within the FIT.

Add image.fit as a target which requires modules, so that modules will
built automatically when using FIT_MODULES is not empty.

Signed-off-by: Simon Glass <sjg@...omium.org>
Suggested-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
Suggested-by: Reviewed-by: Nicolas Schier <nsc@...nel.org>
Acked-by: Nathan Chancellor <nathan@...nel.org>
---

Changes in v6:
- Mention that FIT_MODULES just needs to be non-empty
- Make use of modules.order instead of using 'find'

Changes in v5:
- Build modules automatically if needed (fix from Nicolas Schier)

Changes in v4:
- Rename the Makefile variable from 'EXTRA' to 'MAKE_FIT_FLAGS'
- Use an empty FIT_MODULES to disable the feature, instead of '0'
- Make use of the 'modules' dependency to ensure modules are built
- Pass the list of modules to the script

 Makefile             | 1 +
 arch/arm64/Makefile  | 1 +
 scripts/Makefile.lib | 6 +++++-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 8cd46222fc48..4eccaef95826 100644
--- a/Makefile
+++ b/Makefile
@@ -773,6 +773,7 @@ endif
 # Just "make" or "make all" shall build modules as well
 
 modules-targets := all
+modules-targets += $(if $(FIT_MODULES),image.fit)
 modules-targets += modules
 modules-targets += nsdeps
 modules-targets += compile_commands.json
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 73a10f65ce8b..7036f251ab40 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -174,6 +174,7 @@ endif
 all:	$(notdir $(KBUILD_IMAGE))
 
 image.fit: dtbs
+image.fit: $(if $(FIT_MODULES),modules)
 
 vmlinuz.efi image.fit: Image
 $(BOOT_TARGETS): vmlinux
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 1d581ba5df66..28e0cc0865b1 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -398,11 +398,15 @@ MAKE_FIT := $(srctree)/scripts/make_fit.py
 # Use this to override the compression algorithm
 FIT_COMPRESSION ?= gzip
 
+# Set this to non-empty to include an initrd with all the kernel modules
+FIT_MODULES ?=
+
 quiet_cmd_fit = FIT     $@
       cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
-		--name '$(UIMAGE_NAME)' \
+		--name '$(UIMAGE_NAME)' $(MAKE_FIT_FLAGS) \
 		$(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
 		$(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \
+		$(if $(FIT_MODULES),--modules @$(objtree)/modules.order) \
 		--compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
 
 # XZ
-- 
2.43.0