linux-kernel - Re: [PATCH] Fix: xtensa: add missing sync

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Message-ID: <CAMo8BfJw-dYcpbduUiF9=4J6_kLw+0itZVyr9ys7k=+BvwYbWA@mail.gmail.com>
Date:   Mon, 28 Aug 2017 20:12:22 +0300
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>
Subject: Re: [PATCH] Fix: xtensa: add missing sync_core

Hi Mathieu,

On Mon, Aug 28, 2017 at 12:36 AM, Mathieu Desnoyers
<mathieu.desnoyers@...icios.com> wrote:
> The membarrier system call now requires all architectures to implement
> sync_core(). On Xtensa, it is provided by the EXTW instruction.
>
> [ Completely untested! Can someone on the xtensa side confirm whether
>   EXTW is the right way to serialize core execution and try it out ? ]

Thanks for the patch. I'm currently travelling, I'll give it a try next week
once I'm back at work.

-- 
Thanks.
-- Max