The -fzero-init-padding-bits=all option is not a warning flag, so
defining it in scripts/Makefile.extrawarn is inconsistent.

Move it to the top-level Makefile for consistency.

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

 Makefile                   | 3 +++
 scripts/Makefile.extrawarn | 3 ---
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 89628e354ca7..4a36864dd4bd 100644
--- a/Makefile
+++ b/Makefile
@@ -928,6 +928,9 @@ KBUILD_CFLAGS	+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
 endif
 endif
 
+# Explicitly clear padding bits during variable initialization
+KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
+
 # While VLAs have been removed, GCC produces unreachable stack probes
 # for the randomize_kstack_offset feature. Disable it for all compilers.
 KBUILD_CFLAGS	+= $(call cc-option, -fno-stack-clash-protection)
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index dc081cf46d21..d75897559d18 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -82,9 +82,6 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
 # Warn if there is an enum types mismatch
 KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
 
-# Explicitly clear padding bits during variable initialization
-KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
-
 KBUILD_CFLAGS += -Wextra
 KBUILD_CFLAGS += -Wunused
 
-- 
2.43.0

On Sun, Feb 16, 2025 at 01:15:52AM +0900, Masahiro Yamada wrote:
> The -fzero-init-padding-bits=all option is not a warning flag, so
> defining it in scripts/Makefile.extrawarn is inconsistent.
> 
> Move it to the top-level Makefile for consistency.

Oops, yes. Thanks!

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

Reviewed-by: Kees Cook <kees@kernel.org>

-- 
Kees Cook

On Sun, Feb 16, 2025 at 01:15:52AM +0900, Masahiro Yamada wrote:
> The -fzero-init-padding-bits=all option is not a warning flag, so
> defining it in scripts/Makefile.extrawarn is inconsistent.
> 
> Move it to the top-level Makefile for consistency.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Whoops, I will have to watch for that in the future.

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

> ---
> 
>  Makefile                   | 3 +++
>  scripts/Makefile.extrawarn | 3 ---
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 89628e354ca7..4a36864dd4bd 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -928,6 +928,9 @@ KBUILD_CFLAGS	+= $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
>  endif
>  endif
>  
> +# Explicitly clear padding bits during variable initialization
> +KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
> +
>  # While VLAs have been removed, GCC produces unreachable stack probes
>  # for the randomize_kstack_offset feature. Disable it for all compilers.
>  KBUILD_CFLAGS	+= $(call cc-option, -fno-stack-clash-protection)
> diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
> index dc081cf46d21..d75897559d18 100644
> --- a/scripts/Makefile.extrawarn
> +++ b/scripts/Makefile.extrawarn
> @@ -82,9 +82,6 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
>  # Warn if there is an enum types mismatch
>  KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)
>  
> -# Explicitly clear padding bits during variable initialization
> -KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
> -
>  KBUILD_CFLAGS += -Wextra
>  KBUILD_CFLAGS += -Wunused
>  
> -- 
> 2.43.0
>