linux-kernel - [PATCH 5.15 06/21] kbuild: move objtool

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Date:   Fri, 13 May 2022 16:23:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masahiro Yamada <masahiroy@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 06/21] kbuild: move objtool_args back to scripts/Makefile.build

From: Masahiro Yamada <masahiroy@...nel.org>

[ Upstream commit 8f0c32c788fffa8e88f995372415864039347c8a ]

Commit b1a1a1a09b46 ("kbuild: lto: postpone objtool") moved objtool_args
to Makefile.lib, so the arguments can be used in Makefile.modfinal as
well as Makefile.build.

With commit 850ded46c642 ("kbuild: Fix TRIM_UNUSED_KSYMS with
LTO_CLANG"), module LTO linking came back to scripts/Makefile.build
again.

So, there is no more reason to keep objtool_args in a separate file.

Get it back to the original place, close to the objtool command.

Remove the stale comment too.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 scripts/Makefile.build |   10 ++++++++++
 scripts/Makefile.lib   |   11 -----------
 2 files changed, 10 insertions(+), 11 deletions(-)

--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -224,6 +224,16 @@ cmd_record_mcount = $(if $(findstring $(
 endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 
 ifdef CONFIG_STACK_VALIDATION
+
+objtool_args =								\
+	$(if $(CONFIG_UNWINDER_ORC),orc generate,check)			\
+	$(if $(part-of-module), --module)				\
+	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
+	$(if $(CONFIG_GCOV_KERNEL)$(CONFIG_LTO_CLANG), --no-unreachable)\
+	$(if $(CONFIG_RETPOLINE), --retpoline)				\
+	$(if $(CONFIG_X86_SMAP), --uaccess)				\
+	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)
+
 ifndef CONFIG_LTO_CLANG
 
 __objtool_obj := $(objtree)/tools/objtool/objtool
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -232,17 +232,6 @@ ifeq ($(CONFIG_LTO_CLANG),y)
 mod-prelink-ext := .lto
 endif
 
-# Objtool arguments are also needed for modfinal with LTO, so we define
-# then here to avoid duplication.
-objtool_args =								\
-	$(if $(CONFIG_UNWINDER_ORC),orc generate,check)			\
-	$(if $(part-of-module), --module)				\
-	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
-	$(if $(CONFIG_GCOV_KERNEL)$(CONFIG_LTO_CLANG), --no-unreachable)\
-	$(if $(CONFIG_RETPOLINE), --retpoline)				\
-	$(if $(CONFIG_X86_SMAP), --uaccess)				\
-	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)
-
 # Useful for describing the dependency of composite objects
 # Usage:
 #   $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)