1 # SPDX-License-Identifier: GPL-2.0-only
2 # ===========================================================================
4 # ===========================================================================
9 include $(objtree)/include/config/auto.conf
10 include $(srctree)/scripts/Kbuild.include
11 include $(srctree)/scripts/Makefile.lib
13 # find all modules listed in modules.order
14 modules := $(call read-file, modules.order)
16 __modfinal: $(modules:%.o=%.ko)
19 # modname and part-of-module are set to make c_flags define proper module flags
20 modname = $(notdir $(@:.mod.o=))
23 ccflags-remove-y := $(CC_FLAGS_CFI)
25 %.mod.o: %.mod.c FORCE
26 $(call if_changed_rule,cc_o_c)
28 .module-common.o: $(srctree)/scripts/module-common.c FORCE
29 $(call if_changed_rule,cc_o_c)
31 quiet_cmd_ld_ko_o = LD [M] $@
33 $(LD) -r $(KBUILD_LDFLAGS) \
34 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
35 -T $(objtree)/scripts/module.lds -o $@ $(filter %.o, $^)
37 quiet_cmd_btf_ko = BTF [M] $@
39 if [ ! -f $(objtree)/vmlinux ]; then \
40 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
42 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux $@; \
43 $(RESOLVE_BTFIDS) -b $(objtree)/vmlinux $@; \
46 # Same as newer-prereqs, but allows to exclude specified extra dependencies
47 newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
49 # Same as if_changed, but allows to exclude specified extra dependencies
50 if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
52 printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
54 # Re-generate module BTFs if either module's .ko or vmlinux changed
55 %.ko: %.o %.mod.o .module-common.o $(objtree)/scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),$(objtree)/vmlinux) FORCE
56 +$(call if_changed_except,ld_ko_o,$(objtree)/vmlinux)
57 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
58 +$(if $(newer-prereqs),$(call cmd,btf_ko))
61 targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o) .module-common.o
63 # Add FORCE to the prerequisites of a target to force it to be always rebuilt.
64 # ---------------------------------------------------------------------------
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.
74 existing-targets := $(wildcard $(sort $(targets)))
76 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)