diff options
| -rw-r--r-- | scripts/Makefile.vmlinux_o | 61 | ||||
| -rwxr-xr-x | scripts/link-vmlinux.sh | 41 |
2 files changed, 62 insertions, 40 deletions
diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o new file mode 100644 index 000000000000..a9b375ca86d5 --- /dev/null +++ b/scripts/Makefile.vmlinux_o @@ -0,0 +1,61 @@ +# SPDX-License-Identifier: GPL-2.0-only + +PHONY := __default +__default: vmlinux.o + +include include/config/auto.conf +include $(srctree)/scripts/Kbuild.include + +# Generate a linker script to ensure correct ordering of initcalls for Clang LTO +# --------------------------------------------------------------------------- + +quiet_cmd_gen_initcalls_lds = GEN $@ + cmd_gen_initcalls_lds = \ + $(PYTHON3) $(srctree)/scripts/jobserver-exec \ + $(PERL) $(real-prereqs) > $@ + +.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \ + $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE + $(call if_changed,gen_initcalls_lds) + +targets := .tmp_initcalls.lds + +ifdef CONFIG_LTO_CLANG +initcalls-lds := .tmp_initcalls.lds +endif + +# Link of vmlinux.o used for section mismatch analysis +# --------------------------------------------------------------------------- + +quiet_cmd_ld_vmlinux.o = LD $@ + cmd_ld_vmlinux.o = \ + $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ + $(addprefix -T , $(initcalls-lds)) \ + --whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \ + --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ + +define rule_ld_vmlinux.o + $(call cmd_and_savecmd,ld_vmlinux.o) +endef + +vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE + $(call if_changed_rule,ld_vmlinux.o) + +targets += vmlinux.o + +# Add FORCE to the prequisites of a target to force it to be always rebuilt. +# --------------------------------------------------------------------------- + +PHONY += FORCE +FORCE: + +# Read all saved command lines and dependencies for the $(targets) we +# may be building above, using $(if_changed{,_dep}). As an +# optimization, we don't need to read them if the target does not +# exist, we will rebuild anyway in that case. + +existing-targets := $(wildcard $(sort $(targets))) + +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) + +.PHONY: $(PHONY) diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh index 3f51b08cc203..bf685d4547c1 100755 --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -45,45 +45,6 @@ info() printf " %-7s %s\n" "${1}" "${2}" } -# Generate a linker script to ensure correct ordering of initcalls. -gen_initcalls() -{ - info GEN .tmp_initcalls.lds - - ${PYTHON3} ${srctree}/scripts/jobserver-exec \ - ${PERL} ${srctree}/scripts/generate_initcall_order.pl \ - ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \ - > .tmp_initcalls.lds -} - -# Link of vmlinux.o used for section mismatch analysis -# ${1} output file -modpost_link() -{ - local objects - local lds="" - - objects="--whole-archive \ - ${KBUILD_VMLINUX_OBJS} \ - --no-whole-archive \ - --start-group \ - ${KBUILD_VMLINUX_LIBS} \ - --end-group" - - if is_enabled CONFIG_LTO_CLANG; then - gen_initcalls - lds="-T .tmp_initcalls.lds" - - # This might take a while, so indicate that we're doing - # an LTO link - info LTO ${1} - else - info LD ${1} - fi - - ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects} -} - objtool_link() { local objtoolcmd; @@ -336,7 +297,7 @@ fi; ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1 #link vmlinux.o -modpost_link vmlinux.o +${MAKE} -f "${srctree}/scripts/Makefile.vmlinux_o" objtool_link vmlinux.o # Generate the list of in-tree objects in vmlinux |