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