Re: [PATCH 2/2] kbuild: handle dtb-y and CONFIG_OF_ALL_DTBS natively in Makefile.lib

From: James Hogan
Date: Thu Nov 09 2017 - 07:19:12 EST


(resend using a working From address)

<yamada.masahiro@xxxxxxxxxxxxx> wrote:
> If CONFIG_OF_ALL_DTBS is enabled, "make ARCH=arm64 dtbs" compiles each
> DTB twice; one from arch/arm64/boot/dts/*/Makefile and the other from
> the dtb-$(CONFIG_OF_ALL_DTBS) line in arch/arm64/boot/dts/Makefile.
> It could be a race problem when building DTBS in parallel.
>
> Another minor issue is CONFIG_OF_ALL_DTBS covers only *.dts in vendor
> sub-directories, so this broke when Broadcom added one more hierarchy
> in arch/arm64/boot/dts/broadcom/<soc>/.
>
> One idea to fix the issues in a clean way is to move DTB handling
> to Kbuild core scripts. Makefile.dtbinst already recognizes dtb-y
> natively, so it should not hurt to do so.
>
> Add $(dtb-y) to extra-y, and $(dtb-) as well if CONFIG_OF_ALL_DTBS is
> enabled. All clutter things in Makefiles go away.
>
> As a bonus clean-up, I also removed dts-dirs. Just use subdir-y
> directly to traverse sub-directories.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>

...

> diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
> index 7891ffa..b2b0d88 100644
> --- a/arch/mips/boot/dts/Makefile
> +++ b/arch/mips/boot/dts/Makefile
> @@ -1,20 +1,14 @@
> -dts-dirs += brcm
> -dts-dirs += cavium-octeon
> -dts-dirs += img
> -dts-dirs += ingenic
> -dts-dirs += lantiq
> -dts-dirs += mti
> -dts-dirs += netlogic
> -dts-dirs += ni
> -dts-dirs += pic32
> -dts-dirs += qca
> -dts-dirs += ralink
> -dts-dirs += xilfpga
> +subdir-y += brcm
> +subdir-y += cavium-octeon
> +subdir-y += img
> +subdir-y += ingenic
> +subdir-y += lantiq
> +subdir-y += mti
> +subdir-y += netlogic
> +subdir-y += ni
> +subdir-y += pic32
> +subdir-y += qca
> +subdir-y += ralink
> +subdir-y += xilfpga
>
> -obj-y := $(addsuffix /, $(dts-dirs))
> -
> -dtstree := $(srctree)/$(src)
> -dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(foreach d,$(dts-dirs), $(wildcard $(dtstree)/$(d)/*.dts)))
> -
> -always := $(dtb-y)
> -subdir-y := $(dts-dirs)
> +obj-$(BUILTIN_DTB) := $(addsuffix /, $(subdir-y))

I wonder if that should be CONFIG_BUILTIN_DTB?

This is causing failures in linux-next with MIPS
cavium_octeon_defconfig like below, and changing this line to
CONFIG_BUILTIN_DTB seems to fix it.

arch/mips/cavium-octeon/setup.o: In function `__octeon_is_model_runtime__':
/work/mips/linux/main/./arch/mips/include/asm/octeon/octeon-model.h:368:
undefined reference to `__dtb_octeon_3xxx_begin'
arch/mips/cavium-octeon/setup.o: In function `device_tree_init':
/work/mips/linux/main/arch/mips/cavium-octeon/setup.c:1188: undefined
reference to `__dtb_octeon_3xxx_begin'
/work/mips/linux/main/arch/mips/cavium-octeon/setup.c:1184: undefined
reference to `__dtb_octeon_68xx_begin'
/work/mips/linux/main/arch/mips/cavium-octeon/setup.c:1184: undefined
reference to `__dtb_octeon_68xx_begin'

Thanks
James


--
James Hogan