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Fri, 19 Sep 2025 00:45:17 -0700 (PDT) Date: Fri, 19 Sep 2025 09:45:11 +0200 From: Andrea Parri To: Xu Lu Cc: Guo Ren , robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, ajones@ventanamicro.com, brs@rivosinc.com, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, apw@canonical.com, joe@perches.com Subject: Re: [External] Re: [PATCH v2 0/4] riscv: Add Zalasr ISA extension support Message-ID: References: <20250902042432.78960-1-luxu.kernel@bytedance.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: > The existing implementation of spin_unlock, when followed by > spin_lock, is equal to 'FENCE rw, rw' for operations before This is not true without Zacas, that is, when using LR/SC: write-to-read remains unordered in that case. Andrea