1# SPDX-License-Identifier: GPL-2.0-only 2# =========================================================================== 3# Module final link 4# =========================================================================== 5 6PHONY := __modfinal 7__modfinal: 8 9include $(objtree)/include/config/auto.conf 10include $(srctree)/scripts/Kbuild.include 11include $(srctree)/scripts/Makefile.lib 12 13# find all modules listed in modules.order 14modules := $(call read-file, modules.order) 15 16__modfinal: $(modules:%.o=%.ko) 17 @: 18 19# modname and part-of-module are set to make c_flags define proper module flags 20modname = $(notdir $(@:.mod.o=)) 21part-of-module = y 22GCOV_PROFILE := n 23KCSAN_SANITIZE := n 24ccflags-remove-y := $(CC_FLAGS_CFI) 25 26%.mod.o: %.mod.c FORCE 27 $(call if_changed_rule,cc_o_c) 28 29.module-common.o: $(srctree)/scripts/module-common.c FORCE 30 $(call if_changed_rule,cc_o_c) 31 32quiet_cmd_ld_ko_o = LD [M] $@ 33 cmd_ld_ko_o = \ 34 $(LD) -r $(KBUILD_LDFLAGS) \ 35 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ 36 -T $(objtree)/scripts/module.lds -o $@ $(filter %.o, $^) 37 38quiet_cmd_btf_ko = BTF [M] $@ 39 cmd_btf_ko = \ 40 if [ ! -f $(objtree)/vmlinux ]; then \ 41 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \ 42 else \ 43 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux $@; \ 44 $(RESOLVE_BTFIDS) -b $(objtree)/vmlinux $@; \ 45 fi; 46 47# Same as newer-prereqs, but allows to exclude specified extra dependencies 48newer_prereqs_except = $(filter-out $(PHONY) $(1),$?) 49 50# Same as if_changed, but allows to exclude specified extra dependencies 51if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \ 52 $(cmd); \ 53 printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) 54 55# Re-generate module BTFs if either module's .ko or vmlinux changed 56%.ko: %.o %.mod.o .module-common.o $(objtree)/scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),$(objtree)/vmlinux) FORCE 57 +$(call if_changed_except,ld_ko_o,$(objtree)/vmlinux) 58ifdef CONFIG_DEBUG_INFO_BTF_MODULES 59 +$(if $(newer-prereqs),$(call cmd,btf_ko)) 60endif 61 62targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) .module-common.o 63 64# Add FORCE to the prerequisites of a target to force it to be always rebuilt. 65# --------------------------------------------------------------------------- 66 67PHONY += FORCE 68FORCE: 69 70# Read all saved command lines and dependencies for the $(targets) we 71# may be building above, using $(if_changed{,_dep}). As an 72# optimization, we don't need to read them if the target does not 73# exist, we will rebuild anyway in that case. 74 75existing-targets := $(wildcard $(sort $(targets))) 76 77-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) 78 79.PHONY: $(PHONY) 80