1 files changed, 8 insertions, 3 deletions

diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 4b2721ca97da..6c5469b1473b 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -32,6 +32,10 @@
 # Step 4 is solely used to allow module versioning in external modules,
 # where the CRC of each module is retrieved from the Module.symers file.
 
+# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
+# symbols in the final module linking stage
+# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
+# This is solely usefull to speed up test compiles
 PHONY := _modpost
 _modpost: __modpost
 
@@ -46,7 +50,8 @@ modulesymfile := $(KBUILD_EXTMOD)/Module.symvers
 __modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
 modules   := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
 
-_modpost: $(modules)
+# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
+_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
 
 
 # Step 2), invoke modpost
@@ -58,7 +63,7 @@ quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
         $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \
         $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
         $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
-        $(if $(KBUILD_EXTMOD),-w) \
+        $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) \
         $(wildcard vmlinux) $(filter-out FORCE,$^)
 
 PHONY += __modpost
@@ -92,7 +97,7 @@ targets += $(modules:.ko=.mod.o)
 
 # Step 6), final link of the modules
 quiet_cmd_ld_ko_o = LD [M]  $@
-      cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@            \
+      cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@            \
                           $(filter-out FORCE,$^)
 
 $(modules): %.ko :%.o %.mod.o FORCE