linux-kernel - Re: [PATCH v2 10/13] kbuild: rebuild modules when objtool is updated for CONFIG_LTO

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Message-ID: <202108311040.1F8E65CC5D@keescook>
Date:   Tue, 31 Aug 2021 10:40:21 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 10/13] kbuild: rebuild modules when objtool is updated
 for CONFIG_LTO_CLANG

On Tue, Aug 31, 2021 at 04:40:01PM +0900, Masahiro Yamada wrote:
> We rebuilt objects when objtool was updated, but only for non LTO
> builds.
> 
> For CONFIG_LTO_CLANG, the objtool step is postponed by the link time,
> and nothing happens even if objtool is updated.
> 
> Add the proper objtool dependency to the pre-modpost module link
> for CONFIG_LTO_CLANG.
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook