linux-kernel - Re: [PATCH] openrisc: define mb() as its mandatory

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Date:   Sat, 7 Apr 2018 11:09:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Stafford Horne <shorne@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jan Henrik Weinstock <jan.weinstock@....rwth-aachen.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        openrisc@...ts.librecores.org
Subject: Re: [PATCH] openrisc: define mb() as its mandatory

On Sat, Apr 07, 2018 at 05:58:49AM +0900, Stafford Horne wrote:
> Following Peter Z's patch ("asm-generic: Disallow no-op mb() for SMP
> systems") which makes mb() mandatory for SMP architectures we define it
> as l.msync.  On OpenRISC this will flush the current cores write buffer
> and trigger remote cores to invalidate their caches of the written
> memory.
> 
> Signed-off-by: Stafford Horne <shorne@...il.com>
> Link: https://lkml.org/lkml/2018/1/31/254
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Will Deacon <will.deacon@....com>
> ---
> 
> Notes:
>   - Sorry, its been a while since we discussed this patch is the parent to this 
>     still going in Peter?

Oops.. yes it should. It seems I also lost track of it. Thanks for the
reminder!