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

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Message-ID: <7433411d-fa67-2ddf-58d3-7d6ca04d8e0b@csgroup.eu>
Date:   Sun, 2 Oct 2022 17:57:56 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     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: {standard input}:1440: Error: unrecognized opcode: `mbar'



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


> 
> 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]
>