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From: Paul Walmsley <pjw@kernel.org>
To: Danil Skrebenkov <danil.skrebenkov@cloudbear.ru>
Cc: pjw@kernel.org, Paul Walmsley <paul.walmsley@sifive.com>,
	 Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	 Alexandre Ghiti <alex@ghiti.fr>,
	Charlie Jenkins <charlie@rivosinc.com>,
	 WangYuli <wangyuli@uniontech.com>,
	linux-riscv@lists.infradead.org,  linux-kernel@vger.kernel.org
Subject: Re: [PATCH] RISC-V: cpu-hotplug fix
Date: Wed, 8 Oct 2025 11:50:53 -0600 (MDT)	[thread overview]
Message-ID: <7bc8eb67-0a48-1756-c907-dae7751b4c98@kernel.org> (raw)
In-Reply-To: <20250919132849.31676-1-danil.skrebenkov@cloudbear.ru>

On Fri, 19 Sep 2025, Danil Skrebenkov wrote:

> openSBI v1.7 adds harts checks for ipi operations. Especially it
> adds comparison between hmask passed as an argument from linux
> and mask of online harts (from openSBI side). If they don't
> fit each other the error occurs.
> 
> When cpu is offline, cpu_online_mask is explicitly cleared in
> __cpu_disable. However, there is no explicit clearing of
> mm_cpumask. mm_cpumask is used for rfence operations that
> call openSBI RFENCE extension which uses ipi to remote harts.
> If hart is offline there may be error if mask of linux is not
> as mask of online harts in openSBI.
> 
> this patch adds explicit clearing of mm_cpumask for offline hart.
> 
> Signed-off-by: Danil Skrebenkov <danil.skrebenkov@cloudbear.ru>

Thanks, queued for early v6.18-rc after cleaning up the subject line to be 
more descriptive:

"RISC-V: clear hot-unplugged cores from all task mm_cpumasks to avoid 
rfence errors"


- Paul



      parent reply	other threads:[~2025-10-08 17:50 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-19 13:28 Danil Skrebenkov
2025-09-24 16:56 ` Andrew Jones
2025-10-08 17:50 ` Paul Walmsley [this message]

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