linux-kernel - Re: [PATCH v2 08/18] arm64: don't disable ADR_PREL_PG_HI21* with ARM64_ERRATUM

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Message-ID: <CAKv+Gu9pROJ_T5twJtVn2itzav4x5fypyJWsBr5YbjWUTMFokg@mail.gmail.com>
Date:   Thu, 16 Nov 2017 23:20:40 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kbuild@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Alex Matveev <alxmtvv@...il.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>
Subject: Re: [PATCH v2 08/18] arm64: don't disable ADR_PREL_PG_HI21* with ARM64_ERRATUM_843419

On 16 November 2017 at 23:09, Sami Tolvanen <samitolvanen@...gle.com> wrote:
> On Thu, Nov 16, 2017 at 10:14:17PM +0000, Ard Biesheuvel wrote:
>> OK, so my concern here is that this code probably only operates on
>> fully linked binaries, and not partially linked object files like
>> kernel modules.
>
> Right. That makes sense.
>
>> What is preventing us from using the large model with clang?
>
> We pass -mcmodel=large to clang, but I just confirmed that the
> attribute isn't stored in LLVM IR, which means it's not used during
> link time compilation. I'll see if we can solve this problem by
> passing the correct code model directly to LLVMgold instead. Thanks
> for pointing this out.
>

So at which point is the IR in a partially linked object file
converted into executable code?