linux-kernel - Re: asm-generic: Disallow no-op mb() for SMP systems

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Date:   Sat, 3 Feb 2018 12:43:56 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, Stafford Horne <shorne@...il.com>,
        Will Deacon <will.deacon@....com>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        David Howells <dhowells@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: asm-generic: Disallow no-op mb() for SMP systems

On Sat, Feb 03, 2018 at 03:14:01AM +0800, kbuild test robot wrote:
> Hi Peter,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on asm-generic/master]
> [also build test ERROR on v4.15 next-20180202]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> 
> url:    https://github.com/0day-ci/linux/commits/Peter-Zijlstra/asm-generic-Disallow-no-op-mb-for-SMP-systems/20180203-000108
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
> config: mn10300-asb2364_defconfig (attached as .config)
> compiler: am33_2.0-linux-gcc (GCC) 7.2.0

David, this one is yours :-) Does that mn10300 thing really have
sequentially consistent SMP (no store buffers or anything?)