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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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kbuild: unify two modpost invocations
Currently, modpost is executed twice; first for vmlinux, second
for modules.
This commit merges them.
Current build flow
==================
1) build obj-y and obj-m objects
2) link vmlinux.o
3) modpost for vmlinux
4) link vmlinux
5) modpost for modules
6) link modules (*.ko)
The build steps 1) through 6) are serialized, that is, modules are
built after vmlinux. You do not get benefits of parallel builds when
scripts/link-vmlinux.sh is being run.
New build flow
==============
1) build obj-y and obj-m objects
2) link vmlinux.o
3) modpost for vmlinux and modules
4a) link vmlinux
4b) link modules (*.ko)
In the new build flow, modpost is invoked just once.
vmlinux and modules are built in parallel. One exception is
CONFIG_DEBUG_INFO_BTF_MODULES=y, where modules depend on vmlinux.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada
parent
9c5a0ac3c3
commit
f73edc8951
32
Makefile
32
Makefile
@ -1150,7 +1150,7 @@ cmd_link-vmlinux = \
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$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
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$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
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vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE
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vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) modpost FORCE
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+$(call if_changed_dep,link-vmlinux)
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targets := vmlinux
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@ -1426,7 +1426,13 @@ endif
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# Build modules
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#
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modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_prepare
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# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES
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# is an exception.
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ifdef CONFIG_DEBUG_INFO_BTF_MODULES
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modules: vmlinux
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endif
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modules: modules_prepare
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# Target to prepare building external modules
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modules_prepare: prepare
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@ -1739,8 +1745,12 @@ ifdef CONFIG_MODULES
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$(MODORDER): $(build-dir)
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@:
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modules: modules_check
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
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# This is solely useful to speed up test compiles.
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modules: modpost
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ifneq ($(KBUILD_MODPOST_NOFINAL),1)
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
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endif
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PHONY += modules_check
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modules_check: $(MODORDER)
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@ -1771,6 +1781,11 @@ KBUILD_MODULES :=
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endif # CONFIG_MODULES
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PHONY += modpost
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modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
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$(if $(KBUILD_MODULES), modules_check)
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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# Single targets
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# ---------------------------------------------------------------------------
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# To build individual files in subdirectories, you can do like this:
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@ -1790,16 +1805,19 @@ single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
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single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
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$(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
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$(single-ko): single_modpost
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$(single-ko): single_modules
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@:
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$(single-no-ko): $(build-dir)
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@:
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# Remove MODORDER when done because it is not the real one.
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PHONY += single_modpost
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single_modpost: $(single-no-ko) modules_prepare
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PHONY += single_modules
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single_modules: $(single-no-ko) modules_prepare
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$(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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ifneq ($(KBUILD_MODPOST_NOFINAL),1)
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
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endif
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$(Q)rm -f $(MODORDER)
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single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
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@ -55,7 +55,7 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
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printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
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# Re-generate module BTFs if either module's .ko or vmlinux changed
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$(modules): %.ko: %.o %.mod.o scripts/module.lds $(if $(KBUILD_BUILTIN),vmlinux) FORCE
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$(modules): %.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
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+$(call if_changed_except,ld_ko_o,vmlinux)
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ifdef CONFIG_DEBUG_INFO_BTF_MODULES
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+$(if $(newer-prereqs),$(call cmd,btf_ko))
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@ -32,9 +32,6 @@
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# Step 4 is solely used to allow module versioning in external modules,
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# where the CRC of each module is retrieved from the Module.symvers file.
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# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
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# This is solely useful to speed up test compiles
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PHONY := __modpost
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__modpost:
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@ -45,24 +42,23 @@ MODPOST = scripts/mod/modpost \
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$(if $(CONFIG_MODVERSIONS),-m) \
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$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
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$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
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$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
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$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \
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-o $@
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ifdef MODPOST_VMLINUX
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# 'make -i -k' ignores compile errors, and builds as many modules as possible.
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ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
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MODPOST += -n
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endif
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quiet_cmd_modpost = MODPOST $@
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cmd_modpost = $(MODPOST) $<
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vmlinux.symvers: vmlinux.o
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$(call cmd,modpost)
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__modpost: vmlinux.symvers
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ifeq ($(KBUILD_EXTMOD),)
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# Generate the list of in-tree objects in vmlinux
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# ---------------------------------------------------------------------------
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# This is used to retrieve symbol versions generated by genksyms.
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ifdef CONFIG_MODVERSIONS
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vmlinux.symvers: .vmlinux.objs
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vmlinux.symvers Module.symvers: .vmlinux.objs
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endif
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# Ignore libgcc.a
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@ -83,24 +79,12 @@ targets += .vmlinux.objs
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.vmlinux.objs: $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
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$(call if_changed,vmlinux_objs)
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else
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ifeq ($(KBUILD_EXTMOD),)
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input-symdump := vmlinux.symvers
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output-symdump := modules-only.symvers
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quiet_cmd_cat = GEN $@
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cmd_cat = cat $(real-prereqs) > $@
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ifneq ($(wildcard vmlinux.symvers),)
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__modpost: Module.symvers
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Module.symvers: vmlinux.symvers modules-only.symvers FORCE
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$(call if_changed,cat)
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targets += Module.symvers
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vmlinux.o-if-present := $(wildcard vmlinux.o)
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output-symdump := vmlinux.symvers
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ifdef KBUILD_MODULES
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output-symdump := $(if $(vmlinux.o-if-present), Module.symvers, modules-only.symvers)
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missing-input := $(filter-out $(vmlinux.o-if-present),vmlinux.o)
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endif
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else
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@ -112,56 +96,35 @@ src := $(obj)
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# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
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include $(or $(wildcard $(src)/Kbuild), $(src)/Makefile)
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# modpost option for external modules
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MODPOST += -e
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input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS)
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module.symvers-if-present := $(wildcard Module.symvers)
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output-symdump := $(KBUILD_EXTMOD)/Module.symvers
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missing-input := $(filter-out $(module.symvers-if-present), Module.symvers)
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endif
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MODPOST += -e $(addprefix -i ,$(module.symvers-if-present) $(KBUILD_EXTRA_SYMBOLS))
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existing-input-symdump := $(wildcard $(input-symdump))
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endif # ($(KBUILD_EXTMOD),)
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# modpost options for modules (both in-kernel and external)
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MODPOST += \
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$(addprefix -i ,$(existing-input-symdump)) \
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$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
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$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)
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# 'make -i -k' ignores compile errors, and builds as many modules as possible.
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ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
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MODPOST += -n
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endif
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# Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
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VPATH :=
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$(input-symdump):
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@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
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@echo >&2 ' Modules may not have dependencies or modversions.'
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@echo >&2 ' You may get many unresolved symbol warnings.'
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# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined symbols
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ifneq ($(KBUILD_MODPOST_WARN)$(filter-out $(existing-input-symdump), $(input-symdump)),)
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ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),)
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MODPOST += -w
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endif
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modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER))
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# Read out modules.order to pass in modpost.
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# Otherwise, allmodconfig would fail with "Argument list too long".
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quiet_cmd_modpost = MODPOST $@
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cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
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$(output-symdump): $(MODORDER) $(input-symdump) FORCE
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$(call if_changed,modpost)
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cmd_modpost = \
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$(if $(missing-input), \
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echo >&2 "WARNING: $(missing-input) is missing."; \
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echo >&2 " Modules may not have dependencies or modversions."; \
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echo >&2 " You may get many unresolved symbol warnings.";) \
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sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(vmlinux.o-if-present) -T -
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targets += $(output-symdump)
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$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(moudle.symvers-if-present) FORCE
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$(call if_changed,modpost)
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__modpost: $(output-symdump)
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ifneq ($(KBUILD_MODPOST_NOFINAL),1)
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
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endif
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endif
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PHONY += FORCE
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FORCE:
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@ -214,9 +214,6 @@ if [ "$1" = "clean" ]; then
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exit 0
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fi
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# modpost vmlinux.o to check for section mismatches
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${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1
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info MODINFO modules.builtin.modinfo
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${OBJCOPY} -j .modinfo -O binary vmlinux.o modules.builtin.modinfo
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info GEN modules.builtin
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