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Tue, 28 May 2024 16:54:26 -0700 (PDT) Received: from andrea ([151.76.32.59]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-57852339fc4sm7658198a12.15.2024.05.28.16.54.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 May 2024 16:54:25 -0700 (PDT) Date: Wed, 29 May 2024 01:54:21 +0200 From: Andrea Parri To: Alexandre Ghiti Cc: Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , Boqun Feng , Arnd Bergmann , Leonardo Bras , Guo Ren , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org Subject: Re: [PATCH 2/7] riscv: Implement cmpxchg8/16() using Zabha Message-ID: References: <20240528151052.313031-1-alexghiti@rivosinc.com> <20240528151052.313031-3-alexghiti@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <20240528151052.313031-3-alexghiti@rivosinc.com> > +zabha: \ > + __asm__ __volatile__ ( \ > + prepend \ > + " amocas" cas_sfx " %0, %z2, %1\n" \ > + append \ > + : "+&r" (r), "+A" (*(p)) \ > + : "rJ" (n) \ > + : "memory"); \ Couldn't a platform have Zabha but not have Zacas? I don't see how this asm goto could work in such case, what am I missing? Andrea