modpost: do not parse vmlinux for external module builds

When building external modules, $(objtree)/Module.symvers is scanned
for symbol information of vmlinux and in-tree modules.

Additionally, vmlinux is parsed if it exists in $(objtree)/.
This is totally redundant since all the necessary information is
contained in $(objtree)/Module.symvers.

Do not parse vmlinux at all for external module builds. This makes
sense because vmlinux is deleted by 'make clean'.

'make clean' leaves all the build artifacts for building external
modules. vmlinux is unneeded for that.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index cc19b95c21167bf354d2a2655cdb89647aa5dedb..13842693c143f2a0bb5e744e9e78ce31df0b14de 100644 (file)
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -67,7 +67,11 @@ __modpost:
 
 else
 
-ifneq ($(KBUILD_EXTMOD),)
+MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T -
+
+ifeq ($(KBUILD_EXTMOD),)
+MODPOST += $(wildcard vmlinux)
+else
 
 # set src + obj - they may be used in the modules's Makefile
 obj := $(KBUILD_EXTMOD)
@@ -78,8 +82,6 @@ include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
              $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
 endif
 
-MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)
-
 # find all modules listed in modules.order
 modules := $(sort $(shell cat $(MODORDER)))