linux-kernel - Re: [PATCH 0/7] LLVM: make x86

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Message-ID: <CACT4Y+aeyXK5jwN4Nej-+u302zwC=uwQM4VkMBzesTCpQD4pLQ@mail.gmail.com>
Date:   Fri, 17 Mar 2017 09:17:40 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Michael Davidson <md@...gle.com>
Cc:     Michal Marek <mmarek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Shaohua Li <shli@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "open list:KERNEL BUILD + fi..." <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-crypto@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: [PATCH 0/7] LLVM: make x86_64 kernel build with clang.

On Fri, Mar 17, 2017 at 1:15 AM, Michael Davidson <md@...gle.com> wrote:
> This patch set is sufficient to get the x86_64 kernel to build
> and boot correctly with clang-3.8 or greater.
>
> The resulting build still has about 300 warnings, very few of
> which appear to be significant. Most of them should be fixable
> with some minor code refactoring although a few of them, such
> as the complaints about implict conversions between enumerated
> types may be candidates for just being disabled.

Thanks, Michael!
This will help us a lot with KMSAN (uninit use detector) and code coverage.


> Michael Davidson (7):
>   Makefile, LLVM: add -no-integrated-as to KBUILD_[AC]FLAGS
>   Makefile, x86, LLVM: disable unsupported optimization flags
>   x86, LLVM: suppress clang warnings about unaligned accesses
>   x86, boot, LLVM: #undef memcpy etc in string.c
>   x86, boot, LLVM: Use regparm=0 for memcpy and memset
>   md/raid10, LLVM: get rid of variable length array
>   crypto, x86, LLVM: aesni - fix token pasting
>
>  Makefile                                |  4 ++++
>  arch/x86/Makefile                       |  7 +++++++
>  arch/x86/boot/copy.S                    | 15 +++++++++++++--
>  arch/x86/boot/string.c                  |  9 +++++++++
>  arch/x86/boot/string.h                  | 13 +++++++++++++
>  arch/x86/crypto/aes_ctrby8_avx-x86_64.S |  7 ++-----
>  drivers/md/raid10.c                     |  9 ++++-----
>  7 files changed, 52 insertions(+), 12 deletions(-)
>
> --
> 2.12.0.367.g23dc2f6d3c-goog
>