linux-kernel - [PATCH 2/3] kbuild: enable objtool for *.mod.o and additional kernel objects

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Message-ID: <20241113234526.402738-3-masahiroy@kernel.org>
Date: Thu, 14 Nov 2024 08:45:22 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: Paul Menzel <pmenzel@...gen.mpg.de>,
	Borislav Petkov <bp@...en8.de>,
	Nikolay Borisov <nik.borisov@...e.com>,
	Marco Elver <elver@...gle.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] kbuild: enable objtool for *.mod.o and additional kernel objects

Currently, objtool is disabled in scripts/Makefile.{modfinal,vmlinux}.

This commit moves rule_cc_o_c and rule_as_o_S to scripts/Makefile.lib
and set objtool-enabled to y there.

With this change, *.mod.o, .module-common.o,  builtin-dtb.o, and
vmlinux.export.o will now be covered by objtool.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/Makefile.build    | 17 -----------------
 scripts/Makefile.lib      | 19 +++++++++++++++++++
 scripts/Makefile.modfinal |  4 ++--
 scripts/Makefile.vmlinux  |  4 ++--
 4 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 24e10c821461..18b76947fe96 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -202,23 +202,6 @@ ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
 cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
 endif
 
-define rule_cc_o_c
-	$(call cmd_and_fixdep,cc_o_c)
-	$(call cmd,checksrc)
-	$(call cmd,checkdoc)
-	$(call cmd,gen_objtooldep)
-	$(call cmd,gen_symversions_c)
-	$(call cmd,record_mcount)
-	$(call cmd,warn_shared_object)
-endef
-
-define rule_as_o_S
-	$(call cmd_and_fixdep,as_o_S)
-	$(call cmd,gen_objtooldep)
-	$(call cmd,gen_symversions_S)
-	$(call cmd,warn_shared_object)
-endef
-
 # Built-in and composite module parts
 $(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE
 	$(call if_changed_rule,cc_o_c)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 73e385946855..17c81c346e36 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -302,14 +302,33 @@ endef
 # ===========================================================================
 # These are shared by some Makefile.* files.
 
+objtool-enabled := y
+
 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
 		$(cmd_ld_single_m) \
 		$(cmd_objtool)
 
+define rule_cc_o_c
+	$(call cmd_and_fixdep,cc_o_c)
+	$(call cmd,checksrc)
+	$(call cmd,checkdoc)
+	$(call cmd,gen_objtooldep)
+	$(call cmd,gen_symversions_c)
+	$(call cmd,record_mcount)
+	$(call cmd,warn_shared_object)
+endef
+
 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
       cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
 
+define rule_as_o_S
+	$(call cmd_and_fixdep,as_o_S)
+	$(call cmd,gen_objtooldep)
+	$(call cmd,gen_symversions_S)
+	$(call cmd,warn_shared_object)
+endef
+
 # Copy a file
 # ===========================================================================
 # 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index d0153d033bbb..0547a4b59f13 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal
@@ -26,10 +26,10 @@ KCSAN_SANITIZE := n
 ccflags-remove-y := $(CC_FLAGS_CFI)
 
 %.mod.o: %.mod.c FORCE
-	$(call if_changed_dep,cc_o_c)
+	$(call if_changed_rule,cc_o_c)
 
 .module-common.o: $(srctree)/scripts/module-common.c FORCE
-	$(call if_changed_dep,cc_o_c)
+	$(call if_changed_rule,cc_o_c)
 
 quiet_cmd_ld_ko_o = LD [M]  $@
       cmd_ld_ko_o =							\
diff --git a/scripts/Makefile.vmlinux b/scripts/Makefile.vmlinux
index 1652561896eb..83fc1a861f41 100644
--- a/scripts/Makefile.vmlinux
+++ b/scripts/Makefile.vmlinux
@@ -12,10 +12,10 @@ include $(srctree)/scripts/Makefile.lib
 targets :=
 
 %.o: %.c FORCE
-	$(call if_changed_dep,cc_o_c)
+	$(call if_changed_rule,cc_o_c)
 
 %.o: %.S FORCE
-	$(call if_changed_dep,as_o_S)
+	$(call if_changed_rule,as_o_S)
 
 # Built-in dtb
 # ---------------------------------------------------------------------------
-- 
2.43.0