Commit 8212f898 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: use more subdir- for visiting subdirectories while cleaning 



Documentation/kbuild/makefiles.rst suggests to use "archclean" for
cleaning arch/$(SRCARCH)/boot/, but it is not a hard requirement.

Since commit d92cc4d5 ("kbuild: require all architectures to have
arch/$(SRCARCH)/Kbuild"), we can use the "subdir- += boot" trick for
all architectures. This can take advantage of the parallel option (-j)
for "make clean".

I also cleaned up the comments in arch/$(SRCARCH)/Makefile. The "archdep"
target no longer exists.

Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Reviewed-by: default avatarKees Cook <keescook@chromium.org>
Acked-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
parent 10c6ae27

Documentation/kbuild/makefiles.rst

+2 −15
Original line number Diff line number Diff line
@@ -1050,22 +1050,9 @@ is not sufficient this sometimes needs to be explicit. 
The above assignment instructs kbuild to descend down in the

directory compressed/ when "make clean" is executed.



To support the clean infrastructure in the Makefiles that build the

final bootimage there is an optional target named archclean:



	Example::



		#arch/x86/Makefile

		archclean:

			$(Q)$(MAKE) $(clean)=arch/x86/boot



When "make clean" is executed, make will descend down in arch/x86/boot,

and clean as usual. The Makefile located in arch/x86/boot/ may use

the subdir- trick to descend further down.



Note 1: arch/$(SRCARCH)/Makefile cannot use "subdir-", because that file is

included in the top level makefile, and the kbuild infrastructure

is not operational at that point.

included in the top level makefile. Instead, arch/$(SRCARCH)/Kbuild can use

"subdir-".



Note 2: All directories listed in core-y, libs-y, drivers-y and net-y will

be visited during "make clean".

arch/alpha/Kbuild

+3 −0
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# SPDX-License-Identifier: GPL-2.0-only

obj-y			+= kernel/ mm/

obj-$(CONFIG_MATHEMU)	+= math-emu/



# for cleaning

subdir- += boot

arch/alpha/Makefile

+0 −3
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@@ -55,9 +55,6 @@ $(boot)/vmlinux.gz: vmlinux 
bootimage bootpfile bootpzfile: vmlinux

	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@



archclean:

	$(Q)$(MAKE) $(clean)=$(boot)



archheaders:

	$(Q)$(MAKE) $(build)=arch/alpha/kernel/syscalls all

arch/arc/Kbuild

+3 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

obj-y += kernel/

obj-y += mm/



# for cleaning

subdir- += boot

arch/arc/Makefile

+0 −3
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@@ -112,6 +112,3 @@ uImage: $(uimage-default-y) 
	@$(kecho) '  Image $(boot)/uImage is ready'



CLEAN_FILES += $(boot)/uImage
 


archclean:

	$(Q)$(MAKE) $(clean)=$(boot)