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

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Date:   Fri, 27 May 2022 08:50:53 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, llvm@...ts.linux.dev,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nicolas Schier <n.schier@....de>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Subject: Re: [PATCH v7 8/8] kbuild: rebuild multi-object modules when objtool
 is updated

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@...nel.org>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Tested-by: Nathan Chancellor <nathan@...nel.org>
> Reviewed-by: Nicolas Schier <n.schier@....de>
> Tested-by: Sedat Dilek <sedat.dilek@...il.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