linux-kernel - Re: [RFC PATCH 7/9] x86/mm: Introduce Remote Action Request

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Message-ID: <ff4ae42d-e56d-4e94-b8c9-bcd9b638d97a@intel.com>
Date: Tue, 6 May 2025 08:27:44 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Rik van Riel <riel@...riel.com>, Nadav Amit <nadav.amit@...il.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
 the arch/x86 maintainers <x86@...nel.org>, kernel-team@...a.com,
 Dave Hansen <dave.hansen@...ux.intel.com>, luto@...nel.org,
 peterz@...radead.org, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 "H. Peter Anvin" <hpa@...or.com>, Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [RFC PATCH 7/9] x86/mm: Introduce Remote Action Request

On 5/6/25 08:16, Rik van Riel wrote:
> I suspect that lock is no longer needed, but maybe
> somebody at Intel has a reason why we still do?

I just took a quick look at the locking. It doesn't make any sense to me
either.

I suspect it's just plain not needed.