From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f45.google.com (mail-wr1-f45.google.com [209.85.221.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6DC772D3EDE for ; Fri, 19 Sep 2025 07:45:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.45 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758267923; cv=none; b=ieTd0EnGvXITwtf5lyE+NTt6z1g244ZrBSOmSTfg4+fj47fBPdd76iA8NVoB93LVbVOQlAJij73vNi4SAhDf7oBOMvHuZOnD+2IVaoXZtmtdRSJHUd5lDCOkhVpcVSYTVE1NBL2DVsf4/RP/BZaqGIsxJauiHkUZqVkI5wVNMhI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758267923; c=relaxed/simple; bh=G5NCxklBPHy4efUUiThtpcKjg0wPNcH+CK6EOvnsvrs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dPcslsVsu6XsowbFL5GP5H6L6+Mth49WAZ8cq4WfhX2pE/ZQbqrln0tWIEIt6wxNo/idNtV7/LV3/d+Uz/TLzH6gSMETFcrde7CfsOVQHjiL3cKsLumwJkd1e+6I5lKm96IUHYfwaNqAzjZLyCqbm2oWbAwmDuAckHGwtraDNZI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=GBGigD0c; arc=none smtp.client-ip=209.85.221.45 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GBGigD0c" Received: by mail-wr1-f45.google.com with SMTP id ffacd0b85a97d-3dae49b1293so963416f8f.1 for ; Fri, 19 Sep 2025 00:45:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1758267919; x=1758872719; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=PNMgvIIFlPxMgwjf1A0nfVZAfJVYlyoyJvlDVyQp+0I=; b=GBGigD0cljP/rEOt78vhsH2aVfMuQcqMM+HQAqBJLoFDAPsfDGAfmT0fFIwcRnVO0B PNfwtUID7/+c/KYLqz71vHLsY5Dz2S8ffwPOfWkOY6mTbKtc7wzneCnueD3a9TJY96AQ 6j/OWq20Y21eX90IHt20lRkFHO8Hzcm6Djc7odLkjWE3JUPDDqdkEBb/HXNnI6sIEukD i51cBaepc/aS6DE35g8qkYdy+Mo9KwCIvhQWJEAFEsgDHaMhFmKFuGeDKHKoN4/9zEw6 tY6NRV8ZGRLRx0Kfy0P4lesSck6sE2A1f86NgcxTBPh8p38fsSRV/6A2PibIyCa58GX2 MWVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758267919; x=1758872719; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=PNMgvIIFlPxMgwjf1A0nfVZAfJVYlyoyJvlDVyQp+0I=; b=mtF3heeuj/KUzxNRlQAntSPvfOGbFmaKZcCAl0WTSYPBAcs03Zo5uIWpru6RxhIP2Q Nk6aDnVw6ZeHh2WBrCv8NYCIYHR5sM30e1w9+Yvg/Pk2WiGyzPFVgKS//HLygqx/v5D1 i+w5dLP+0a0lTg6BY8A+9yYF6pEymIiyh60L05Hw7g/tsgUOULbWTx77xy39NT8lvrU9 ldEBNCHTrezctIDoIgTbPrYiOrZTW0pjib0sKbav6CJeJuqhSytAIbhCpaJc9iMdxc68 qJFjtxo7OL53vOHu9I71ujktBrFcRgKuD1dHYEMLsM2R3tst83HmJEenEa7SqiecbPwf pZ6A== X-Forwarded-Encrypted: i=1; AJvYcCVmri74+tjEO1KJM06QCwMRx0A6Ep87bhF8UIdc+/v78EYGkvh2Tarcxx2lXabXoyMgUE7njsype/StVaQ=@vger.kernel.org X-Gm-Message-State: AOJu0YysGvh4sCVRirBs8BfIm1EoPpN3aCa4pibtFe8Eyc6POt9ccLhy ikFrl26QWAGTjyZc6eeaMgs/tvol+46eGC9RYseYBruiS0F7dH0MgI+Q X-Gm-Gg: ASbGncs4mIG3NyjS2XbetzIO76cWZnUb2wPr2WcW0cSO7PzAIZ3rDnJMvkDEE/ZSAty 08aAylQWM3zIEPdnltrLl8rkIuKLjXckz1ZjBJHr26Xh98MNR1UHb+qTH+YsNiv9ZnhXuZ4vFO1 jmrHLHBYM6NLLfT2SYMAXuLzb8pOvQCBO9y66D/uT3tdTi+I+xXfujHTZo6KLnmq/Llfw2EHb56 j8+PAo/cudiNwnvUMcrGIHqyR0i2cD9H1Mk1AOX8T66wel/yGmTyhON4MIvcG7UW5oVmAfPSTzr rW2kJ7601ru9AV85qlJZ+pk25i8uSgHimNEDoMpYjuqKpB6+sayUh0ksmKLxbX8H7VwyV2WRAGT e5x83nhWmAmLoQLCNgci6 X-Google-Smtp-Source: AGHT+IG5w03VkX5w0L+qmk9oTgo8UMgIyxUlqtHb7DAa5eouVlBho3WcVeCjzVUkdw6abcur45ZJQg== X-Received: by 2002:a05:6000:25c3:b0:3ee:1586:6c85 with SMTP id ffacd0b85a97d-3ee8713efdcmr1612059f8f.57.1758267918368; Fri, 19 Sep 2025 00:45:18 -0700 (PDT) Received: from andrea ([176.201.192.207]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45f3211e8c7sm73637115e9.3.2025.09.19.00.45.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); 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: 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: > 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