linux-kernel - Re: [PATCH v2 2/4] MIPS: Introduce config options for LLSC availability

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Message-Id: <743a2297-ff4a-4cb3-ae61-8cd4956aa565@app.fastmail.com>
Date: Thu, 20 Jun 2024 17:30:48 +0100
From: "Jiaxun Yang" <jiaxun.yang@...goat.com>
To: "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>
Cc: "Jonas Gorski" <jonas.gorski@...il.com>,
 "Maciej W. Rozycki" <macro@...am.me.uk>,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] MIPS: Introduce config options for LLSC availability

在2024年6月20日六月 下午5:06，Thomas Bogendoerfer写道：
[...]
> do you have an user manual stating that the R5k bug is fixed on this CPUs ?

I actually investigated R5500 a little bit.

There is no explicit document mentioned this bug is fixed on R5500, but it's not
mentioned on "VR Series 64-/32-Bit Microprocessor Programming Guide" [1] either,
while some other hardware limitations are mentioned in that guide.

Plus EMMA platform, which was removed form the kernel, doesn't have
cpu-feature-overrides.h. This means that the platform was running with LLSC
enabled.

So I think this CPU is not affected.

[1]: https://repo.oss.cipunited.com/archives/docs/NEC/U10710EJ5V0AN00.pdf
>
> Thomas.
>
> -- 
> Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
> good idea.                                                [ RFC1925, 2.3 ]

-- 
- Jiaxun