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[46.142.11.211]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490bc3d66c8sm138026905e9.10.2026.06.05.04.12.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Jun 2026 04:12:39 -0700 (PDT) Message-ID: <153b976e-ce36-44fe-899a-01fc5877e573@gmail.com> Date: Fri, 5 Jun 2026 13:12:38 +0200 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] MIPS: smp: report dying CPU to RCU in stop_this_cpu() Content-Language: en-US To: Sebastian Andrzej Siewior Cc: Thomas Bogendoerfer , linux-mips@vger.kernel.org, Clark Williams , Steven Rostedt , Thomas Gleixner , Jiayuan Chen , linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260604182407.3109536-1-jelonek.jonas@gmail.com> <20260605064250.q0aRKkon@linutronix.de> <02b1e77e-5b7e-41cb-95b6-731ed00d9e74@gmail.com> <20260605103418.tH3rlwmO@linutronix.de> From: Jonas Jelonek In-Reply-To: <20260605103418.tH3rlwmO@linutronix.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi, On 05.06.26 12:34, Sebastian Andrzej Siewior wrote: > Does > echo 0 > /sys/devices/system/cpu/cpu1/online > > lead to the same problem? Funny, my device doesn't have this 'online' file, neither for the other CPUs. So it seems this CPU hotplug isn't supported/used here? Or am I missing a Kconfig option for that? I'm working on a Realtek RTL931x SoC here, it has MIPS interAptiv cores. I can provide more information if needed. > I missed that arm64 has also this but only if the online path fails kind > of early, see > 04e613ded8c26 ("arm64: smp: Tell RCU about CPUs that fail to come online") > > so this not the "normal" case but an exception. Mips seems to be doing > something different here. I am not sure if this is the only thing that > is missing. > >> Best, >> Jonas > Sebastian Best, Jonas