linux-kernel - Re: [PATCH] x86: crypto: fix building crc32c with clang ias

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Message-ID: <20200527193456.GA2141183@ubuntu-s3-xlarge-x86>
Date:   Wed, 27 May 2020 12:34:56 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Diab Neiroukh <officiallazerl0rd@...il.com>
Subject: Re: [PATCH] x86: crypto: fix building crc32c with clang ias

On Wed, May 27, 2020 at 08:24:35PM +0200, Arnd Bergmann wrote:
> On Wed, May 27, 2020 at 6:42 PM Nathan Chancellor
> <natechancellor@...il.com> wrote:
> >
> > On Wed, May 27, 2020 at 04:17:40PM +0200, Arnd Bergmann wrote:
> > > The clang integrated assembler complains about movzxw:
> > >
> > > arch/x86/crypto/crc32c-pcl-intel-asm_64.S:173:2: error: invalid instruction mnemonic 'movzxw'
> > >
> > > It seems that movzwq is the mnemonic that it expects instead,
> > > and this is what objdump prints when disassembling the file.
> > >
> > > Fixes: 6a8ce1ef3940 ("crypto: crc32c - Optimize CRC32C calculation with PCLMULQDQ instruction")
> > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >
> > We had an identical patch pending from another contributor, see the
> > discussion and result in the issue below.
> >
> > https://github.com/ClangBuiltLinux/linux/issues/1010
> >
> > Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
> >
> 
> Was the other one submitted upstream? If yes, let's use that one.
> 
>      Arnd

No, at least not that I saw. I've added Diab to CC now though to
confirm.

Cheers,
Nathan