linux-kernel - [PATCH v4 5/7] kbuild: Allow adding modules into the FIT ramdisk

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Message-ID: <20251006230205.521341-6-sjg@chromium.org>
Date: Mon,  6 Oct 2025 17:01:56 -0600
From: Simon Glass <sjg@...omium.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	Ahmad Fatoum <a.fatoum@...gutronix.de>,
	Masahiro Yamada <masahiroy@...nel.org>,
	J . Neuschäfer <j.ne@...teo.net>,
	Nicolas Schier <nicolas@...sle.eu>,
	Tom Rini <trini@...sulko.com>,
	Simon Glass <sjg@...omium.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>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Rong Xu <xur@...gle.com>,
	Will Deacon <will@...nel.org>,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 5/7] 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.

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

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

 arch/arm64/boot/Makefile |  4 ++++
 scripts/Makefile.lib     | 10 ++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/Makefile b/arch/arm64/boot/Makefile
index b5a08333bc57..d10c85f96aea 100644
--- a/arch/arm64/boot/Makefile
+++ b/arch/arm64/boot/Makefile
@@ -43,6 +43,10 @@ $(obj)/Image.zst: $(obj)/Image FORCE
 $(obj)/Image.xz: $(obj)/Image FORCE
 	$(call if_changed,xzkern)
 
+ifeq ($(FIT_MODULES),1)
+.PHONY: modules
+$(obj)/image.fit: modules
+endif
 $(obj)/image.fit: $(obj)/Image $(obj)/dts/dtbs-list FORCE
 	$(call if_changed,fit)
 
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 1d581ba5df66..c6a3aa653035 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -398,11 +398,17 @@ MAKE_FIT := $(srctree)/scripts/make_fit.py
 # Use this to override the compression algorithm
 FIT_COMPRESSION ?= gzip
 
+# Set this to 1 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)' \
+      cmd_fit = $(if $(FIT_MODULES), \
+		find $(objtree) -name '*.ko' > $(objtree)/.modules-list 2>/dev/null &&) \
+		$(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
+		--name '$(UIMAGE_NAME)' $(MAKE_FIT_FLAGS) \
 		$(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
 		$(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \
+		$(if $(FIT_MODULES),--modules @$(objtree)/.modules-list) \
 		--compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
 
 # XZ
-- 
2.43.0