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Subject[PATCH 5.6 022/126] kbuild: avoid concurrency issue in parallel building dtbs and dtbs_check
From: Masahiro Yamada <>

[ Upstream commit b5154bf63e5577faaaca1d942df274f7de91dd2a ]

'make dtbs_check' checks the shecma in addition to building *.dtb files,
in other words, 'make dtbs_check' is a super-set of 'make dtbs'.
So, you do not have to do 'make dtbs dtbs_check', but I want to keep
the build system as robust as possible in any use.

Currently, 'dtbs' and 'dtbs_check' are independent of each other.
In parallel building, two threads descend into arch/*/boot/dts/,
one for dtbs and the other for dtbs_check, then end up with building
the same DTB simultaneously.

This commit fixes the concurrency issue. Otherwise, I see build errors
like follows:

$ make ARCH=arm64 defconfig
$ make -j16 ARCH=arm64 DT_SCHEMA_FILES=Documentation/devicetree/bindings/arm/psci.yaml dtbs dtbs_check
DTC arch/arm64/boot/dts/qcom/sdm845-cheza-r2.dtb
DTC arch/arm64/boot/dts/amlogic/meson-gxl-s905x-p212.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb
DTC arch/arm64/boot/dts/freescale/imx8mn-evk.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb
DTC arch/arm64/boot/dts/zte/zx296718-pcbox.dtb
DTC arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dt.yaml
DTC arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p230.dtb
DTC arch/arm64/boot/dts/xilinx/zynqmp-zc1254-revA.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dtb
DTC arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet-inx.dtb
DTC arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb
CHECK arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dt.yaml
fixdep: error opening file: arch/arm64/boot/dts/allwinner/.sun50i-h6-orangepi-lite2.dtb.d: No such file or directory
make[2]: *** [scripts/Makefile.lib:296: arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb] Error 2
make[2]: *** Deleting file 'arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-lite2.dtb'
make[2]: *** Waiting for unfinished jobs....
DTC arch/arm64/boot/dts/rockchip/rk3399-gru-scarlet-kd.dtb
DTC arch/arm64/boot/dts/amlogic/meson-gxl-s905d-p231.dtb
DTC arch/arm64/boot/dts/xilinx/zynqmp-zc1275-revA.dtb
DTC arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dtb
fixdep: parse error; no targets found
make[2]: *** [scripts/Makefile.lib:296: arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb] Error 1
make[2]: *** Deleting file 'arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dtb'
make[1]: *** [scripts/ arch/arm64/boot/dts/allwinner] Error 2
make[1]: *** Waiting for unfinished jobs....
DTC arch/arm64/boot/dts/renesas/r8a77951-salvator-xs.dtb

Signed-off-by: Masahiro Yamada <>
Reviewed-by: Rob Herring <>
Signed-off-by: Sasha Levin <>
Makefile | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 713f93cceffe..d00e14219e27 100644
--- a/Makefile
+++ b/Makefile
@@ -1248,11 +1248,15 @@ ifneq ($(dtstree),)
$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@

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

+ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
+dtbs: dt_binding_check
dtbs_check: export CHECK_DTBS=1
-dtbs_check: dt_binding_check
+dtbs_check: dtbs

$(Q)$(MAKE) $(dtbinst)=$(dtstree)

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