linux-kernel - Re: [PATCH v3 13/30] kbuild: lto: postpone objtool

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Message-ID: <202009181427.86DE61B@keescook>
Date:   Fri, 18 Sep 2020 14:27:34 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH v3 13/30] kbuild: lto: postpone objtool

On Fri, Sep 18, 2020 at 01:14:19PM -0700, Sami Tolvanen wrote:
> With LTO, LLVM bitcode won't be compiled into native code until
> modpost_link, or modfinal for modules. This change postpones calls
> to objtool until after these steps, and moves objtool_args to
> Makefile.lib, so the arguments can be reused in Makefile.modfinal.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Thanks for reorganizing this!

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

-- 
Kees Cook