linux-kernel - Re: [PATCH v7 2/7] arm64: barrier: Support smp_cond_load_relaxed

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Message-ID: <871pmvws5o.fsf@oracle.com>
Date: Tue, 21 Oct 2025 20:07:31 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: "Christoph Lameter (Ampere)" <cl@...two.org>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        bpf@...r.kernel.org, arnd@...db.de, catalin.marinas@....com,
        will@...nel.org, peterz@...radead.org, akpm@...ux-foundation.org,
        mark.rutland@....com, harisokn@...zon.com, ast@...nel.org,
        rafael@...nel.org, daniel.lezcano@...aro.org, memxor@...il.com,
        zhenglifeng1@...wei.com, xueshuai@...ux.alibaba.com,
        joao.m.martins@...cle.com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com
Subject: Re: [PATCH v7 2/7] arm64: barrier: Support
 smp_cond_load_relaxed_timeout()


Christoph Lameter (Ampere) <cl@...two.org> writes:

> On Thu, 16 Oct 2025, Ankur Arora wrote:
>
>> +#define SMP_TIMEOUT_POLL_COUNT	1
>
> A way to disable the spinning in the core code and thus arm64 wont spin
> there anymore. Good.
>
> Spinning is bad and a waste of cpu resources. If this is done then I
> would like the arch code to implement the spinning and not the core so

Agreed.

> that there is a motivation for the arch maintainer to
> come up with a way to avoid the spinning at some point.
>
> The patch is ok as is.
>
> Reviewed-by: Christoph Lameter (Ampere) <cl@...two.org>

Thanks for all the reviews!

--
ankur