Commit c1525349 authored Feb 16, 2025 by Masahiro Yamada

kbuild: move -fzero-init-padding-bits=all to the top-level Makefile



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

parent 9d702bb1

Makefile

+3 −0

Original line number	Diff line number	Diff line
		@@ -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)

scripts/Makefile.extrawarn

+0 −3

Original line number	Diff line number	Diff line
		@@ -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