diff options
Diffstat (limited to 'scripts/Makefile.modpost')
| -rw-r--r-- | scripts/Makefile.modpost | 199 |
1 files changed, 103 insertions, 96 deletions
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 8dcdca27d836..d7d45067d08b 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0 # =========================================================================== # Module versions # =========================================================================== @@ -5,23 +6,22 @@ # Stage one of module building created the following: # a) The individual .o files used for the module # 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 +# c) A <module>.mod file, listing the name of the preliminary <module>.o file, +# plus all .o files +# d) modules.order, which lists all the modules # Stage 2 is handled by this file and does the following -# 1) Find all modules from the files listed in $(MODVERDIR)/ +# 1) Find all modules listed in modules.order # 2) modpost is then used to -# 3) create one <module>.mod.c file pr. module +# 3) create one <module>.mod.c file per module # 4) create one Module.symvers file with CRC for all exported symbols -# 5) compile all <module>.mod.c files -# 6) final link of the module to a <module.ko> file # Step 3 is used to place certain information in the module's ELF # section, including information such as: # Version magic (see include/linux/vermagic.h for full details) # - Kernel release # - SMP is CONFIG_SMP -# - PREEMPT is CONFIG_PREEMPT +# - PREEMPT is CONFIG_PREEMPT[_RT] # - GCC Version # Module info # - Module version (MODULE_VERSION) @@ -32,119 +32,126 @@ # Step 4 is solely used to allow module versioning in external modules, # where the CRC of each module is retrieved from the Module.symvers 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 useful to speed up test compiles -PHONY := _modpost -_modpost: __modpost +PHONY := __modpost +__modpost: -include include/config/auto.conf -include scripts/Kbuild.include +include $(objtree)/include/config/auto.conf +include $(srctree)/scripts/Kbuild.include -# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info -ifneq ($(KBUILD_EXTMOD),) +MODPOST = $(objtree)/scripts/mod/modpost -# set src + obj - they may be used when building the .mod.c file -obj := $(KBUILD_EXTMOD) -src := $(obj) +modpost-args = \ + $(if $(CONFIG_MODULES),-M) \ + $(if $(CONFIG_MODVERSIONS),-m) \ + $(if $(CONFIG_BASIC_MODVERSIONS),-b) \ + $(if $(CONFIG_EXTENDED_MODVERSIONS),-x) \ + $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \ + $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ + $(if $(KBUILD_MODPOST_WARN),-w) \ + $(if $(KBUILD_NSDEPS),-d modules.nsdeps) \ + $(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \ + $(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \ + -o $@ -# 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 - -kernelsymfile := $(objtree)/Module.symvers -modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers - -# Step 1), find all modules listed in $(MODVERDIR)/ -MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u -__modules := $(shell $(MODLISTCMD)) -modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) - -# Stop after building .o files if NOFINAL is set. Makes compile tests quicker -_modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) +modpost-deps := $(MODPOST) -# Step 2), invoke modpost -# Includes step 3,4 -modpost = scripts/mod/modpost \ - $(if $(CONFIG_MODVERSIONS),-m) \ - $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ - $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ - $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ - $(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \ - $(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ - $(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ - $(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) - -# We can go over command line length here, so be careful. -quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules - cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) -s -T - +# 'make -i -k' ignores compile errors, and builds as many modules as possible. +ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),) +modpost-args += -n +endif -PHONY += __modpost -__modpost: $(modules:.ko=.o) FORCE - $(call cmd,modpost) $(wildcard vmlinux) +# Read out modules.order to pass in modpost. +# Otherwise, allmodconfig would fail with "Argument list too long". +ifdef KBUILD_MODULES +modpost-args += -T modules.order +modpost-deps += modules.order +endif -quiet_cmd_kernel-mod = MODPOST $@ - cmd_kernel-mod = $(modpost) $@ +ifeq ($(KBUILD_EXTMOD),) -vmlinux.o: FORCE - $(call cmd,kernel-mod) +# Generate the list of in-tree objects in vmlinux +# --------------------------------------------------------------------------- -# Declare generated files as targets for modpost -$(symverfile): __modpost ; -$(modules:.ko=.mod.c): __modpost ; +# This is used to retrieve symbol versions generated by genksyms. +ifdef CONFIG_MODVERSIONS +vmlinux.symvers Module.symvers: .vmlinux.objs +endif +# Ignore libgcc.a +# Some architectures do '$(CC) --print-libgcc-file-name' to borrow libgcc.a +# from the toolchain, but there is no EXPORT_SYMBOL in it. + +quiet_cmd_vmlinux_objs = GEN $@ + cmd_vmlinux_objs = \ + for f in $(real-prereqs); do \ + case $${f} in \ + *libgcc.a) ;; \ + *) $(AR) t $${f} ;; \ + esac \ + done > $@ + +targets += .vmlinux.objs +.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE + $(call if_changed,vmlinux_objs) + +ifdef CONFIG_TRIM_UNUSED_KSYMS +ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST) +ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$(if $(wildcard $(ksym-wl)),,$(srctree)/))$(ksym-wl) +modpost-args += -t $(addprefix -u , $(ksym-wl)) +modpost-deps += $(ksym-wl) +endif -# Step 5), compile all *.mod.c files +ifeq ($(wildcard vmlinux.o),) +missing-input := vmlinux.o +output-symdump := modules-only.symvers +else +modpost-args += vmlinux.o +modpost-deps += vmlinux.o +output-symdump := $(if $(KBUILD_MODULES), Module.symvers, vmlinux.symvers) +endif -# modname is set to make c_flags define KBUILD_MODNAME -modname = $(notdir $(@:.mod.o=)) +else -quiet_cmd_cc_o_c = CC $@ - cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ - -c -o $@ $< +# set src + obj - they may be used in the modules's Makefile +obj := . +src := $(srcroot) -$(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE - $(call if_changed_dep,cc_o_c) +# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS +include $(kbuild-file) -targets += $(modules:.ko=.mod.o) +output-symdump := Module.symvers -# Step 6), final link of the modules -quiet_cmd_ld_ko_o = LD [M] $@ - cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \ - $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ - -o $@ $(filter-out FORCE,$^) +ifeq ($(wildcard $(objtree)/Module.symvers),) +missing-input := $(objtree)/Module.symvers +else +modpost-args += -i $(objtree)/Module.symvers +modpost-deps += $(objtree)/Module.symvers +endif -$(modules): %.ko :%.o %.mod.o FORCE - $(call if_changed,ld_ko_o) +modpost-args += -e $(addprefix -i , $(KBUILD_EXTRA_SYMBOLS)) -targets += $(modules) +endif # ($(KBUILD_EXTMOD),) +quiet_cmd_modpost = MODPOST $@ + cmd_modpost = \ + $(if $(missing-input), \ + echo >&2 "WARNING: $(missing-input) is missing."; \ + echo >&2 " Modules may not have dependencies or modversions."; \ + echo >&2 " You may get many unresolved symbol errors."; \ + echo >&2 " You can set KBUILD_MODPOST_WARN=1 to turn errors into warning"; \ + echo >&2 " if you want to proceed at your own risk.";) \ + $(MODPOST) $(modpost-args) -# Add FORCE to the prequisites of a target to force it to be always rebuilt. -# --------------------------------------------------------------------------- +targets += $(output-symdump) +$(output-symdump): $(modpost-deps) FORCE + $(call if_changed,modpost) +__modpost: $(output-symdump) PHONY += FORCE - FORCE: -# Read all saved command lines and dependencies for the $(targets) we -# may be building above, using $(if_changed{,_dep}). As an -# optimization, we don't need to read them if the target does not -# exist, we will rebuild anyway in that case. - -targets := $(wildcard $(sort $(targets))) -cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) - -ifneq ($(cmd_files),) - include $(cmd_files) -endif - +existing-targets := $(wildcard $(sort $(targets))) -# 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. +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) .PHONY: $(PHONY) |