linux-kernel - Re: ARC: allmodconfig: Error: inappropriate arguments for opcode 'mpyd'

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Date:   Mon, 28 Sep 2020 21:23:43 +0000
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "lkft-triage@...ts.linaro.org" <lkft-triage@...ts.linaro.org>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: ARC: allmodconfig: Error: inappropriate arguments for opcode
 'mpyd'

Hi Naresh,

On 9/23/20 9:20 PM, Naresh Kamboju wrote:
> arc:allmodconfig build failed with gcc-8, gcc-9 and gcc-10 on Linus's
> mainline tree.
> 
> Build log:
> ------------
> make -sk KBUILD_BUILD_USER=TuxBuild -C/linux ARCH=arc
> CROSS_COMPILE=arc-elf32- HOSTCC=gcc CC="sccache arc-elf32-gcc" O=build
> allmodconfig
> 
> make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j16 ARCH=arc
> CROSS_COMPILE=arc-elf32- HOSTCC=gcc CC="sccache arc-elf32-gcc" O=build
> uImage
> 

...

> {standard input}: Assembler messages:
> {standard input}:9360: Error: inappropriate arguments for opcode 'mpyd'
> make[3]: *** [../scripts/Makefile.build:283: kernel/sched/core.o] Error 1

Thx for testing this and bringing to our attention.
I've created a github issue for gcc.

https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/issues/300

We will also look at bunch of other warnings being spit out.

Thx,
-Vineet