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([2a01:4b00:bd21:4f00:7cc6:d3ca:494:116c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-477b106b10asm63098875e9.10.2025.11.19.11.00.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Nov 2025 11:00:42 -0800 (PST) Message-ID: <82fe6ace-2cfe-4351-b7b4-895e9c29cced@gmail.com> Date: Wed, 19 Nov 2025 19:00:41 +0000 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Pavel Begunkov Subject: Re: [PATCH v3 10/10] selftests/io_uring: add bpf io_uring selftests To: Ming Lei Cc: io-uring@vger.kernel.org, axboe@kernel.dk, Martin KaFai Lau , bpf@vger.kernel.org, Alexei Starovoitov , Andrii Nakryiko References: <6143e4393c645c539fc34dc37eeb6d682ad073b9.1763031077.git.asml.silence@gmail.com> Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/14/25 13:08, Ming Lei wrote: > On Thu, Nov 13, 2025 at 11:59:47AM +0000, Pavel Begunkov wrote: ... >> + bpf_printk("queue nop request, data %lu\n", (unsigned long)reqs_to_run); >> + sqe = &sqes[sq_hdr->tail & (SQ_ENTRIES - 1)]; >> + sqe->user_data = reqs_to_run; >> + sq_hdr->tail++; > > Looks this way turns io_uring_enter() into pthread-unsafe, does it need to > be documented? Assuming you mean parallel io_uring_enter() calls modifying the SQ, it's not different from how it currently is. If you're sharing an io_uring, threads need to sync the use of SQ/CQ. -- Pavel Begunkov