linux-kernel - Re: [PATCH] arm64: mm: force write fault for atomic RMW instructions

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Message-ID: <8c6cc22a-5e24-ede5-94d9-06064a68403d@linux.com>
Date: Mon, 13 May 2024 15:41:51 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...ux.com>
To: Yang Shi <yang@...amperecomputing.com>
cc: Catalin Marinas <catalin.marinas@....com>, will@...nel.org, 
    scott@...amperecomputing.com, linux-arm-kernel@...ts.infradead.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: mm: force write fault for atomic RMW
 instructions

On Fri, 10 May 2024, Yang Shi wrote:

> Yeah, I'm confused too. Triggering write fault in the first place should be 
> fine, right? Can we update the spec?

That is certainly the best solution. Howver, there is a large base of 
machines out there now with this issue.