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objtool: Add CONFIG_OBJTOOL_WERROR

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Objtool warnings can be indicative of crashes, broken live patching, or
even boot failures.  Ignoring them is not recommended.

Add CONFIG_OBJTOOL_WERROR to upgrade objtool warnings to errors by
enabling the objtool --Werror option.  Also set --backtrace to print the
branches leading up to the warning, which can help considerably when
debugging certain warnings.

To avoid breaking bots too badly for now, make it the default for real
world builds only (!COMPILE_TEST).

Co-developed-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/3e7c109313ff15da6c80788965cc7450115b0196.1741975349.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2025-03-14 12:29:11 -07:00 committed by Peter Zijlstra
parent aa8b3e64fd
commit 36799069b4
2 changed files with 12 additions and 0 deletions
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11
lib/Kconfig.debug
View File

@ -545,6 +545,17 @@ config FRAME_POINTER
config OBJTOOL
bool
config OBJTOOL_WERROR
bool "Upgrade objtool warnings to errors"
depends on OBJTOOL && !COMPILE_TEST
help
Fail the build on objtool warnings.
Objtool warnings can indicate kernel instability, including boot
failures. This option is highly recommended.
If unsure, say Y.
config STACK_VALIDATION
bool "Compile-time stack metadata validation"
depends on HAVE_STACK_VALIDATION && UNWINDER_FRAME_POINTER

1
scripts/Makefile.lib
View File

@ -277,6 +277,7 @@ objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call
objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess
objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable
objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
objtool-args-$(CONFIG_OBJTOOL_WERROR) += --Werror --backtrace
objtool-args = $(objtool-args-y) \
$(if $(delay-objtool), --link) \