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From:   Arnd Bergmann <arnd@kernel.org>
Date:   Wed, 9 Dec 2020 10:07:08 +0100
Message-ID: <CAK8P3a1aCiDta9_4-M6tstR+eX53ZaO65wdmoTXdZo2bBQmAWg@mail.gmail.com>
Subject: Re: [PATCH v8 00/16] Add support for Clang LTO
To:     =?UTF-8?B?RsSBbmctcnXDrCBTw7JuZw==?= <maskray@google.com>
Cc:     Sami Tolvanen <samitolvanen@google.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Will Deacon <will@kernel.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        clang-built-linux <clang-built-linux@googlegroups.com>,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        linux-arch <linux-arch@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
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On Wed, Dec 9, 2020 at 6:23 AM 'F=C4=81ng-ru=C3=AC S=C3=B2ng' via Clang Bui=
lt Linux
<clang-built-linux@googlegroups.com> wrote:
>
> On Tue, Dec 8, 2020 at 1:02 PM Arnd Bergmann <arnd@kernel.org> wrote:
> >
> > On Tue, Dec 8, 2020 at 9:59 PM Arnd Bergmann <arnd@kernel.org> wrote:
> > >
> > > Attaching the config for "ld.lld: error: Never resolved function from
> > >   blockaddress (Producer: 'LLVM12.0.0' Reader: 'LLVM 12.0.0')"
> >
> > And here is a new one: "ld.lld: error: assignment to symbol
> > init_pg_end does not converge"
>
> This is interesting. I changed the symbol assignment to a separate
> loop in https://reviews.llvm.org/D66279
> Does raising the limit help? Sometimes the kernel linker script can be
> rewritten to be more friendly to the linker...

If that requires rebuilding lld, testing it is beyond what I can help with
right now. Hopefully someone can reproduce it with my .config.

       Arnd