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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Jonas Jelonek <jelonek.jonas@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-mips@vger.kernel.org, Clark Williams <clrkwllms@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@kernel.org>,
	Jiayuan Chen <jiayuan.chen@linux.dev>,
	linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Subject: Re: [PATCH] MIPS: smp: report dying CPU to RCU in stop_this_cpu()
Message-ID: <20260605064250.q0aRKkon@linutronix.de>
References: <20260604182407.3109536-1-jelonek.jonas@gmail.com>
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In-Reply-To: <20260604182407.3109536-1-jelonek.jonas@gmail.com>

On 2026-06-04 18:24:07 [+0000], Jonas Jelonek wrote:
=E2=80=A6
> This issue popped up during kernel bump downstream in OpenWrt from
> 6.18.33 to 6.18.34, since the suspected change has been backported to
> 6.18 stable branch [1].

I would avoid the link and simply write after the backport of the patch
or so.

> Call rcutree_report_cpu_dead() once interrupts are disabled, mirroring the
> generic CPU-hotplug offline path (and arm64's stop handling), so RCU stops
> waiting on the parked CPUs and grace periods can still complete.

This is part of cpuhp_report_idle_dead(). Is it now invoked twice? Or is
something else missing/ different?=20

Sebastian