From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 10/13] kbuild: rebuild modules when objtool is updated for CONFIG_LTO_CLANG
Date: Tue, 31 Aug 2021 16:40:01 +0900 [thread overview]
Message-ID: <20210831074004.3195284-11-masahiroy@kernel.org> (raw)
In-Reply-To: <20210831074004.3195284-1-masahiroy@kernel.org>
We rebuilt objects when objtool was updated, but only for non LTO
builds.
For CONFIG_LTO_CLANG, the objtool step is postponed by the link time,
and nothing happens even if objtool is updated.
Add the proper objtool dependency to the pre-modpost module link
for CONFIG_LTO_CLANG.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
scripts/Makefile.build | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index cdc09e9080ca..b94dfc87b7fa 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -451,10 +451,15 @@ endif
quiet_cmd_ld_o_a = LD [M] $@
cmd_ld_o_a = $(LD) $(ld_flags) -r -o $@ --whole-archive $< $(cmd_objtool)
+define rule_ld_o_a
+ $(call cmd_and_savecmd,ld_o_a)
+ $(call cmd,gen_objtooldep)
+endef
+
$(obj)/%.prelink.o: part-of-module := y
$(obj)/%.prelink.o: $(obj)/%.a $(module-symver) FORCE
- $(call if_changed,ld_o_a)
+ $(call if_changed_rule,ld_o_a)
quiet_cmd_ar_module = AR [M] $@
cmd_ar_module = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
--
2.30.2
next prev parent reply other threads:[~2021-08-31 7:40 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 7:39 [PATCH v2 00/13] kbuild: second round of Clang LTO refactoring Masahiro Yamada
2021-08-31 7:39 ` [PATCH v2 01/13] kbuild: move objtool_args back to scripts/Makefile.build Masahiro Yamada
2021-09-04 18:18 ` Josh Poimboeuf
2021-08-31 7:39 ` [PATCH v2 02/13] kbuild: rename __objtool_obj to objtool Masahiro Yamada
2021-08-31 17:16 ` Nick Desaulniers
2021-08-31 17:29 ` Kees Cook
2021-09-04 18:19 ` Josh Poimboeuf
2021-08-31 7:39 ` [PATCH v2 03/13] kbuild: store the objtool command in *.cmd files Masahiro Yamada
2021-08-31 17:23 ` Nick Desaulniers
2021-08-31 17:30 ` Kees Cook
2021-09-04 18:04 ` Josh Poimboeuf
2021-09-04 18:45 ` Josh Poimboeuf
2021-09-08 16:12 ` Masahiro Yamada
2021-08-31 7:39 ` [PATCH v2 04/13] kbuild: factor out OBJECT_FILES_NON_STANDARD check into a macro Masahiro Yamada
2021-08-31 17:25 ` Nick Desaulniers
2021-08-31 17:31 ` Kees Cook
2021-09-04 18:59 ` Josh Poimboeuf
2021-08-31 7:39 ` [PATCH v2 05/13] kbuild: detect objtool update without using .SECONDEXPANSION Masahiro Yamada
2021-08-31 17:32 ` Kees Cook
2021-09-03 0:43 ` Masahiro Yamada
2021-08-31 17:33 ` Nick Desaulniers
2021-09-02 23:42 ` Masahiro Yamada
2021-09-04 19:04 ` Josh Poimboeuf
2021-08-31 7:39 ` [PATCH v2 06/13] kbuild: reuse $(cmd_objtool) for cmd_cc_lto_link_modules Masahiro Yamada
2021-08-31 17:35 ` Kees Cook
2021-09-03 0:39 ` Masahiro Yamada
2021-09-03 1:49 ` Kees Cook
2021-09-04 19:11 ` Josh Poimboeuf
2021-08-31 7:39 ` [PATCH v2 07/13] kbuild: do not create built-in.a.symversions or lib.a.symversions Masahiro Yamada
2021-08-31 17:36 ` Kees Cook
2021-08-31 7:39 ` [PATCH v2 08/13] kbuild: build modules in the same way with/without Clang LTO Masahiro Yamada
2021-08-31 17:39 ` Kees Cook
2021-08-31 17:46 ` Nick Desaulniers
2021-08-31 7:40 ` [PATCH v2 09/13] kbuild: add cmd_and_savecmd macro Masahiro Yamada
2021-08-31 17:39 ` Kees Cook
2021-08-31 7:40 ` Masahiro Yamada [this message]
2021-08-31 17:40 ` [PATCH v2 10/13] kbuild: rebuild modules when objtool is updated for CONFIG_LTO_CLANG Kees Cook
2021-09-04 19:13 ` Josh Poimboeuf
2021-08-31 7:40 ` [PATCH v2 11/13] kbuild: always postpone CRC links for module versioning Masahiro Yamada
2021-08-31 7:40 ` [PATCH v2 12/13] kbuild: merge cmd_modversions_c and cmd_modversions_S Masahiro Yamada
2021-08-31 7:40 ` [PATCH v2 13/13] kbuild: merge cmd_ar_builtin and cmd_ar_module Masahiro Yamada
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