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 d92cc4d51643 ("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: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)

1 files changed, 1 insertions, 7 deletions

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 450b351dfa8e..69c45f600273 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -3,9 +3,7 @@
 # s390/Makefile
 #
 # This file is included by the global makefile so that you can add your own
-# architecture-specific flags and dependencies. Remember to do have actions
-# for "archclean" and "archdep" for cleaning up and making dependencies for
-# this architecture
+# architecture-specific flags and dependencies.
 #
 # Copyright (C) 1994 by Linus Torvalds
 #
@@ -147,10 +145,6 @@ zfcpdump:
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 
-archclean:
-	$(Q)$(MAKE) $(clean)=$(boot)
-	$(Q)$(MAKE) $(clean)=$(tools)
-
 archheaders:
 	$(Q)$(MAKE) $(build)=$(syscalls) uapi