linux-kernel - Re: [PATCH] MIPS: ralink: select WEAK_REORDERING_BEYOND

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Date:   Fri, 12 Mar 2021 11:33:41 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Cc:     John Crispin <john@...ozen.org>,
        linux-mediatek@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: ralink: select WEAK_REORDERING_BEYOND_LLSC on
 MT7621

On Sun, Mar 07, 2021 at 11:08:06AM -0800, Ilya Lipnitskiy wrote:
> Upstream a long-standing OpenWrt patch for RALINK MT7621 SoC. Selecting
> WEAK_REORDERING_BEYOND_LLSC fixes random kernel hangs. This bug and fix
> was reported by MediaTek WCN division [0].
> 
> [0]: https://lists.infradead.org/pipermail/lede-commits/2017-August/004537.html

I don't see the Mediatek WCN reporting there. Looking at the 1004K user
manual I couldn't find a notice about such behaviour. So this looks
more like a fix for papering over the real bug by just introducing
a few more syncs. Could you please point me to where this is
really documented ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]