linux-kernel - Re: [PATCH v3 1/5] asm-generic: barrier: Add smp_cond_load_relaxed

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Message-ID: <e4f4cc15-194a-5203-c9a8-c9cd0334a922@gentwo.org>
Date: Wed, 13 Aug 2025 09:54:12 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Arnd Bergmann <arnd@...db.de>
cc: Catalin Marinas <catalin.marinas@....com>, 
    Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org, 
    Linux-Arch <linux-arch@...r.kernel.org>, 
    linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org, 
    Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
    Andrew Morton <akpm@...ux-foundation.org>, 
    Mark Rutland <mark.rutland@....com>, harisokn@...zon.com, 
    Alexei Starovoitov <ast@...nel.org>, 
    Kumar Kartikeya Dwivedi <memxor@...il.com>, zhenglifeng1@...wei.com, 
    xueshuai@...ux.alibaba.com, Joao Martins <joao.m.martins@...cle.com>, 
    Boris Ostrovsky <boris.ostrovsky@...cle.com>, 
    Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, 
    "Rafael J . Wysocki" <rafael@...nel.org>, 
    Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v3 1/5] asm-generic: barrier: Add
 smp_cond_load_relaxed_timewait()

On Wed, 13 Aug 2025, Arnd Bergmann wrote:

> I think there is a reasonable chance that in the future we may want
> to turn the event stream off on systems that support WFET, since that
> is better for both low-power systems and virtual machines with CPU
> overcommit.

WFET is coming in with V9.something I believe so its good to be prepared
and it will simplify the logic.