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Subject[PATCH] kbuild: add dtbs_prepare target
Factor out the common prerequisites for DT compilation into the new
target, dtbs_prepare.

Add comments in case you wonder why include/config/kernel.release is
the prerequisite. Our policy is that installation targets must not
(re)compile any build artifacts in the tree. If we make modules_install
depend on include/config/kernel.release and it is executed under the
root privilege, it may be owned by root.

Signed-off-by: Masahiro Yamada <>

Makefile | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index a9bd55edb75e..8aa4dbb8f878 100644
--- a/Makefile
+++ b/Makefile
@@ -1367,16 +1367,22 @@ endif

ifneq ($(dtstree),)

-%.dtb: include/config/kernel.release scripts_dtc
+%.dtb: dtbs_prepare
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

-%.dtbo: include/config/kernel.release scripts_dtc
+%.dtbo: dtbs_prepare
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

-PHONY += dtbs dtbs_install dtbs_check
-dtbs: include/config/kernel.release scripts_dtc
+PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
+dtbs: dtbs_prepare
$(Q)$(MAKE) $(build)=$(dtstree)

+# include/config/kernel.release is not actually required for building DTBs,
+# but for installing DTBs because INSTALL_DTBS_PATH contains $(KERNELRELEASE).
+# We do not want to move it to dtbs_install. The policy is installation
+# targets (, which may run as root) must not modify the tree.
+dtbs_prepare: include/config/kernel.release scripts_dtc
ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
export CHECK_DTBS=y
dtbs: dt_binding_check
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