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authorMasahiro Yamada <masahiroy@kernel.org>2022-05-27 13:01:55 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2022-06-01 17:07:29 +0300
commitf6b66ca4f38b1169313383aec7fa0a8446205ebb (patch)
treed2fd6a7785d73c7e4a7f0e4b4e9c58a387facdf7 /scripts
parentebd191b38c5ea177318543a08e544cf2f7df944d (diff)
downloadlinux-f6b66ca4f38b1169313383aec7fa0a8446205ebb.tar.xz
kbuild: rebuild multi-object modules when objtool is updated
When CONFIG_LTO_CLANG or CONFIG_X86_KERNEL_IBT is enabled, objtool for multi-object modules is postponed until the objects are linked together. Make sure to re-run objtool and re-link multi-object modules when objtool is updated. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Tested-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nicolas Schier <n.schier@avm.de> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.build11
1 files changed, 8 insertions, 3 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a1edbfe4310b..4cb7145071b9 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -413,13 +413,18 @@ $(obj)/modules.order: $(obj-m) FORCE
$(obj)/lib.a: $(lib-y) FORCE
$(call if_changed,ar)
-quiet_cmd_link_multi-m = LD [M] $@
- cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) $(cmd_objtool)
+quiet_cmd_ld_multi_m = LD [M] $@
+ cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) $(cmd_objtool)
+
+define rule_ld_multi_m
+ $(call cmd_and_savecmd,ld_multi_m)
+ $(call cmd,gen_objtooldep)
+endef
$(multi-obj-m): objtool-enabled := $(delay-objtool)
$(multi-obj-m): part-of-module := y
$(multi-obj-m): %.o: %.mod FORCE
- $(call if_changed,link_multi-m)
+ $(call if_changed_rule,ld_multi_m)
$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
targets := $(filter-out $(PHONY), $(targets))