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Tue, 12 Aug 2025 06:09:10 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:8113:2b11:8f42:672f]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3b79c338c7dsm44458535f8f.0.2025.08.12.06.09.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Aug 2025 06:09:09 -0700 (PDT) Mime-Version: 1.0 Date: Tue, 12 Aug 2025 15:09:09 +0200 Message-Id: Subject: Re: [PATCH 0/2] riscv, bpf: fix reads of thread_info.cpu Cc: "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , "Martin KaFai Lau" , "Eduard Zingerman" , "Song Liu" , "Yonghong Song" , "John Fastabend" , "KP Singh" , "Stanislav Fomichev" , "Hao Luo" , "Jiri Olsa" , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , "Pu Lehui" , "Puranjay Mohan" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Kumar Kartikeya Dwivedi" , , To: "Alexandre Ghiti" , From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20250812090256.757273-2-rkrcmar@ventanamicro.com> <1fdaa939-d26c-454a-a722-7d0a590557b7@ghiti.fr> In-Reply-To: <1fdaa939-d26c-454a-a722-7d0a590557b7@ghiti.fr> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250812_060912_097358_642CA056 X-CRM114-Status: UNSURE ( 5.76 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org 2025-08-12T13:37:16+02:00, Alexandre Ghiti : > @Radim: This is the third similar bug, did you check all assembly code > (and bpf) to make sure we don't have anymore left or should I? I looked at load/store instructions, including bpf, and focussed on patterns where we access non-xlen sized data through an offset. (Nothing else popped up, but I mostly used grep and cscope as I don't know of any semantic tool, so my confidence levels are low.) _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv