[PATCH] kbuild: make multiple directory targets work properly

[Masahiro Yamada <masahiroy@kernel.org>]

Currently, the single-target build does not work when two
or more sub-directories are given:

  $ make fs/ kernel/ lib/
    CALL    scripts/checksyscalls.sh
    CALL    scripts/atomic/check-atomics.sh
    DESCEND  objtool
  make[2]: Nothing to be done for 'kernel/'.
  make[2]: Nothing to be done for 'fs/'.
  make[2]: Nothing to be done for 'lib/'.

Make it work properly.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

Linus,

If you want to use this patch soon (seems useful since
you are travelling), please feel free to apply it directly.

If you wait for my next pull request, I will apply it to
my tree.

Either is fine with me.



 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 65a5dc653deb..ef8913a8eb2a 100644
--- a/Makefile
+++ b/Makefile
@@ -1679,7 +1679,7 @@ PHONY += descend $(build-dirs)
 descend: $(build-dirs)
 $(build-dirs): prepare
 	$(Q)$(MAKE) $(build)=$@ \
-	single-build=$(if $(filter-out $@/, $(single-no-ko)),1) \
+	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
 	need-builtin=1 need-modorder=1
 
 clean-dirs := $(addprefix _clean_, $(clean-dirs))
-- 
2.17.1