commit 7e13191879d6d589cd987a8db3a70019251fc757
author Masahiro Yamada <yamada.masahiro@socionext.com> Wed Jul 17 15:17:49 2019 +0900
committer Masahiro Yamada <yamada.masahiro@socionext.com> Wed Jul 17 22:39:27 2019 +0900
tree bb7f7e187bc33cdee33c2518321aeb98cc8a328b
parent d09778d16e20bc4f1f4971cc9a9fd7ff6ba898ff

kbuild: do not create empty modules.order in the prepare stage

Currently, $(objtree)/modules.order is touched in two places.

In the 'prepare0' rule, scripts/Makefile.build creates an empty
modules.order while processing 'obj=.'

In the 'modules' rule, the top-level Makefile overwrites it with
the correct list of modules.

While this might be a good side-effect that modules.order is made
empty every time (probably this is not intended functionality),
I personally do not like this behavior.

Create modules.order only when it is sensible to do so.

This avoids creating the following pointless files:

  scripts/basic/modules.order
  scripts/dtc/modules.order
  scripts/gcc-plugins/modules.order
  scripts/genksyms/modules.order
  scripts/mod/modules.order
  scripts/modules.order
  scripts/selinux/genheaders/modules.order
  scripts/selinux/mdp/modules.order
  scripts/selinux/modules.order

Going forward, $(objtree)/modules.order lists the modules that
was built in the last successful build.

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

Makefile

diff --git a/Makefile b/Makefile
index e432857..b74a6e9 100644
--- a/Makefile
+++ b/Makefile
@@ -1072,7 +1072,7 @@
 
 PHONY += $(vmlinux-dirs)
 $(vmlinux-dirs): prepare
-	$(Q)$(MAKE) $(build)=$@ need-builtin=1
+	$(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1
 
 filechk_kernel.release = \
 	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
@@ -1616,7 +1616,7 @@
 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
 PHONY += $(module-dirs) modules
 $(module-dirs): prepare $(objtree)/Module.symvers
-	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
+	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) need-modorder=1
 
 modules: $(module-dirs)
 	@$(kecho) '  Building modules, stage 2.';

scripts/Makefile.build

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 5829ccb..631bb89 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -63,7 +63,7 @@
 builtin-target := $(obj)/built-in.a
 endif
 
-ifdef CONFIG_MODULES
+ifeq ($(CONFIG_MODULES)$(need-modorder),y1)
 modorder-target := $(obj)/modules.order
 endif