1 # SPDX-License-Identifier: GPL-2.0-only
2 # ===========================================================================
4 # ===========================================================================
9 include include/config/auto.conf
10 include $(srctree)/scripts/Kbuild.include
12 # for c_flags and objtool_args
13 include $(srctree)/scripts/Makefile.lib
15 # find all modules listed in modules.order
16 modules := $(sort $(shell cat $(MODORDER)))
18 __modfinal: $(modules)
21 # modname and part-of-module are set to make c_flags define proper module flags
22 modname = $(notdir $(@:.mod.o=))
25 quiet_cmd_cc_o_c = CC [M] $@
26 cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $<
28 %.mod.o: %.mod.c FORCE
29 $(call if_changed_dep,cc_o_c)
31 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
33 ifdef CONFIG_LTO_CLANG
34 # With CONFIG_LTO_CLANG, reuse the object file we compiled for modpost to
35 # avoid a second slow LTO link
38 # ELF processing was skipped earlier because we didn't have native code,
39 # so let's now process the prelinked binary before we link the module.
41 ifdef CONFIG_STACK_VALIDATION
43 $(objtree)/tools/objtool/objtool $(objtool_args) \
44 $(@:.ko=$(prelink-ext).o);
46 endif # CONFIG_STACK_VALIDATION
48 endif # CONFIG_LTO_CLANG
50 quiet_cmd_ld_ko_o = LD [M] $@
52 $(LD) -r $(KBUILD_LDFLAGS) \
53 $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
54 -T scripts/module.lds -o $@ $(filter %.o, $^); \
55 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
57 quiet_cmd_btf_ko = BTF [M] $@
59 if [ -f vmlinux ]; then \
60 LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J --btf_base vmlinux $@; \
62 printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \
65 # Same as newer-prereqs, but allows to exclude specified extra dependencies
66 newer_prereqs_except = $(filter-out $(PHONY) $(1),$?)
68 # Same as if_changed, but allows to exclude specified extra dependencies
69 if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
71 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
74 # Re-generate module BTFs if either module's .ko or vmlinux changed
75 $(modules): %.ko: %$(prelink-ext).o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
76 +$(call if_changed_except,ld_ko_o,vmlinux)
77 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
78 +$(if $(newer-prereqs),$(call cmd,btf_ko))
81 targets += $(modules) $(modules:.ko=.mod.o)
83 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
84 # ---------------------------------------------------------------------------
89 # Read all saved command lines and dependencies for the $(targets) we
90 # may be building above, using $(if_changed{,_dep}). As an
91 # optimization, we don't need to read them if the target does not
92 # exist, we will rebuild anyway in that case.
94 existing-targets := $(wildcard $(sort $(targets)))
96 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)