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kbuild: handle dtb-y and CONFIG_OF_ALL_DTBS natively in Makefile.lib

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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 <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
[robh: corrected BUILTIN_DTB to CONFIG_BUILTIN_DTB]
Signed-off-by: Rob Herring <[email protected]>
This commit is contained in:
Masahiro Yamada 2017-11-05 14:30:53 +09:00 • committed by Rob Herring
commit 7e7962dd1a
48 changed files with 53 additions and 182 deletions
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7
arch/arc/boot/dts/Makefile
View file

@ -10,7 +10,6 @@ dtb-y := $(builtindtb-y).dtb
.SECONDARY: $(obj)/$(builtindtb-y).dtb.S
dtstree := $(srctree)/$(src)
dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
always := $(dtb-y)
# for CONFIG_OF_ALL_DTBS test
dtstree := $(srctree)/$(src)
dtb- := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))