diff mbox series

[v5,12/12] kbuild: rebuild multi-object modules when objtool is updated

Message ID 20220511164514.2741934-13-masahiroy@kernel.org (mailing list archive)
State New, archived
Headers show
Series kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h) | expand

Commit Message

Masahiro Yamada May 11, 2022, 4:45 p.m. UTC 
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>
---

(no changes since v4)

Changes in v4:
  - New
    Resent of my previous submission
    https://lore.kernel.org/linux-kbuild/20210831074004.3195284-11-masahiroy@kernel.org/

 scripts/Makefile.build | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Comments

Nicolas Schier May 13, 2022, 11:40 a.m. UTC | #1 
On Thu, May 12, 2022 at 01:45:14AM +0900, Masahiro Yamada wrote:
> 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>
> ---
> 
> (no changes since v4)
> 
> Changes in v4:
>   - New
>     Resent of my previous submission
>     https://lore.kernel.org/linux-kbuild/20210831074004.3195284-11-masahiroy@kernel.org/
> 
>  scripts/Makefile.build | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index f546b5f1f33f..4e6902e099e8 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -404,13 +404,18 @@ $(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))
> -- 
> 2.32.0
> 

Reviewed-by: Nicolas Schier <n.schier@avm.de>
diff mbox series

Patch

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index f546b5f1f33f..4e6902e099e8 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -404,13 +404,18 @@  $(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))