Re: [PATCH v7 8/8] kbuild: rebuild multi-object modules when objtool is updated

Josh Poimboeuf
2022-05-27T15:50:56Z

On Fri, May 27, 2022 at 07:01:55PM +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>
> Tested-by: Nathan Chancellor <nathan@kernel.org>
> Reviewed-by: Nicolas Schier <n.schier@avm.de>
> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)

Hi Masahiro,

Is it also possible to rebuild vmlinux.o when objtool changes, for
CONFIG_LTO_CLANG, CONFIG_X86_KERNEL_IBT, or CONFIG_NOINSTR_VALIDATION?
That doesn't seem to be happening.

--
Josh