linux-kernel - Re: [kbuild-all] Re: {standard input}:1440: Error: unrecognized opcode: `mbar'

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Date:   Thu, 13 Oct 2022 10:28:54 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        kernel test robot <lkp@...el.com>
Cc:     "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [kbuild-all] Re: {standard input}:1440: Error: unrecognized
 opcode: `mbar'



On 10/3/2022 1:57 AM, Christophe Leroy wrote:
> 
> 
> Le 01/10/2022 à 22:39, kernel test robot a écrit :
>> Hi Christophe,
>>
>> FYI, the error/warning still remains.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   b357fd1c2afc1a3e1b73dc4574bb7ac0e3bd4193
>> commit: 2255411d1d0f0661d1e5acd5f6edf4e6652a345a powerpc/44x: Fix build failure with GCC 12 (unrecognized opcode: `wrteei')
>> date:   9 weeks ago
>> config: powerpc-randconfig-r015-20221001
>> compiler: powerpc-linux-gcc (GCC) 12.1.0
>> reproduce (this is a W=1 build):
>>           wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>           chmod +x ~/bin/make.cross
>>           # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2255411d1d0f0661d1e5acd5f6edf4e6652a345a
>>           git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>           git fetch --no-tags linus master
>>           git checkout 2255411d1d0f0661d1e5acd5f6edf4e6652a345a
>>           # save the config file
>>           mkdir build_dir && cp config build_dir/.config
>>           COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag where applicable
>> | Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
>>
>>      {standard input}: Assembler messages:
>>>> {standard input}:1440: Error: unrecognized opcode: `mbar'
>>      {standard input}:1457: Error: unrecognized opcode: `mbar'
> 
> When you select CONFIG_TOOLCHAIN_DEFAULT_CPU=y, you have to provide a
> compiler which matches your config.
> 
> Here you are building for powerpc 44x, seems like your version of GCC
> doesn't default to -mpcu=440

Hi Christophe,

Thanks for the reply, we'll disable CONFIG_TOOLCHAIN_DEFAULT_CPU for 
powerpc.

Best Regards,
Rong Chen

> 
> 
>>
>> Kconfig warnings: (for reference only)
>>      WARNING: unmet direct dependencies detected for HOTPLUG_CPU
>>      Depends on [n]: SMP [=y] && (PPC_PSERIES [=n] || PPC_PMAC [=n] || PPC_POWERNV [=n] || FSL_SOC_BOOKE [=n])
>>      Selected by [y]:
>>      - PM_SLEEP_SMP [=y] && SMP [=y] && (ARCH_SUSPEND_POSSIBLE [=y] || ARCH_HIBERNATION_POSSIBLE [=y]) && PM_SLEEP [=y]
>>
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