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authorCao jin <caoj.fnst@cn.fujitsu.com>2017-06-30 05:45:43 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2017-07-03 02:03:10 +0300
commitc4e6fff1ae5729c2af159008b13fca39fbbac70e (patch)
tree9211990b482146ec41338f2a2f9848ba1ca28f5d /Makefile
parentd77698df39a512911586834d303275ea5fda74d0 (diff)
downloadlinux-c4e6fff1ae5729c2af159008b13fca39fbbac70e.tar.xz
kbuild: improve comments on KBUILD_SRC
Original comments is confusing on "OBJ directory", make it clear. Bonus: move comments close to what it wants to comment. Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile6
1 files changed, 3 insertions, 3 deletions
diff --git a/Makefile b/Makefile
index 4d50f0546637..41ed3062337b 100644
--- a/Makefile
+++ b/Makefile
@@ -106,8 +106,8 @@ export quiet Q KBUILD_VERBOSE
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.
-# KBUILD_SRC is set on invocation of make in OBJ directory
-# KBUILD_SRC is not intended to be used by the regular user (for now)
+# KBUILD_SRC is not intended to be used by the regular user (for now),
+# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
ifeq ($(KBUILD_SRC),)
# OK, Make called in directory where kernel src resides
@@ -128,7 +128,6 @@ ifneq ($(words $(subst :, ,$(CURDIR))), 1)
endif
ifneq ($(KBUILD_OUTPUT),)
-# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
@@ -141,6 +140,7 @@ PHONY += $(MAKECMDGOALS) sub-make
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
@:
+# Invoke a second make in the output directory, passing relevant variables
sub-make:
$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))