diff options
Diffstat (limited to 'scripts/Makefile.modpost')
| -rw-r--r-- | scripts/Makefile.modpost | 88 |
1 files changed, 65 insertions, 23 deletions
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 94b550e21be..69f0a1417e9 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -4,7 +4,7 @@ # # Stage one of module building created the following: # a) The individual .o files used for the module -# b) A <module>.o file wich is the .o files above linked together +# b) A <module>.o file which is the .o files above linked together # c) A <module>.mod file in $(MODVERDIR)/, listing the name of the # the preliminary <module>.o file, plus all .o files @@ -18,7 +18,7 @@ # Step 3 is used to place certain information in the module's ELF # section, including information such as: -# Version magic (see include/vermagic.h for full details) +# Version magic (see include/linux/vermagic.h for full details) # - Kernel release # - SMP is CONFIG_SMP # - PREEMPT is CONFIG_PREEMPT @@ -30,35 +30,70 @@ # - See include/linux/module.h for more details # Step 4 is solely used to allow module versioning in external modules, -# where the CRC of each module is retreived from the Module.symers file. +# where the CRC of each module is retrieved from the Module.symvers file. -.PHONY: _modpost +# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined +# symbols in the final module linking stage +# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. +# This is solely useful to speed up test compiles +PHONY := _modpost _modpost: __modpost -include .config +include include/config/auto.conf +include scripts/Kbuild.include + +# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info +ifneq ($(KBUILD_EXTMOD),) + +# set src + obj - they may be used when building the .mod.c file +obj := $(KBUILD_EXTMOD) +src := $(obj) + +# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS +include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ + $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) +endif + include scripts/Makefile.lib -symverfile := $(objtree)/Module.symvers +kernelsymfile := $(objtree)/Module.symvers +modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers # Step 1), find all modules listed in $(MODVERDIR)/ -__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod))) +MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u +__modules := $(shell $(MODLISTCMD)) modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) -_modpost: $(modules) - +# Stop after building .o files if NOFINAL is set. Makes compile tests quicker +_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) # Step 2), invoke modpost # Includes step 3,4 -quiet_cmd_modpost = MODPOST - cmd_modpost = scripts/mod/modpost \ - $(if $(CONFIG_MODVERSIONS),-m) \ - $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ - $(if $(KBUILD_EXTMOD),-i,-o) $(symverfile) \ - $(filter-out FORCE,$^) +modpost = scripts/mod/modpost \ + $(if $(CONFIG_MODVERSIONS),-m) \ + $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ + $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ + $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ + $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \ + $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ + $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ + $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) + +MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -.PHONY: __modpost -__modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE - $(call cmd,modpost) +# We can go over command line length here, so be careful. +quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules + cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) $(MODPOST_OPT) -s -T - + +PHONY += __modpost +__modpost: $(modules:.ko=.o) FORCE + $(call cmd,modpost) $(wildcard vmlinux) + +quiet_cmd_kernel-mod = MODPOST $@ + cmd_kernel-mod = $(modpost) $@ + +vmlinux.o: FORCE + $(call cmd,kernel-mod) # Declare generated files as targets for modpost $(symverfile): __modpost ; @@ -68,10 +103,10 @@ $(modules:.ko=.mod.c): __modpost ; # Step 5), compile all *.mod.c files # modname is set to make c_flags define KBUILD_MODNAME -modname = $(*F) +modname = $(notdir $(@:.mod.o=)) quiet_cmd_cc_o_c = CC $@ - cmd_cc_o_c = $(CC) $(c_flags) $(CFLAGS_MODULE) \ + cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ -c -o $@ $< $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE @@ -81,8 +116,9 @@ 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 $@ \ - $(filter-out FORCE,$^) + cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \ + $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ + -o $@ $(filter-out FORCE,$^) $(modules): %.ko :%.o %.mod.o FORCE $(call if_changed,ld_ko_o) @@ -93,7 +129,7 @@ targets += $(modules) # Add FORCE to the prequisites of a target to force it to be always rebuilt. # --------------------------------------------------------------------------- -.PHONY: FORCE +PHONY += FORCE FORCE: @@ -108,3 +144,9 @@ cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),) include $(cmd_files) endif + + +# Declare the contents of the .PHONY variable as phony. We keep that +# information in a variable se we can use it in if_changed and friends. + +.PHONY: $(PHONY) |