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Mon, 16 Feb 2026 07:17:32 -0800 (PST) Message-ID: <7f1f9575-b9a7-4c67-832a-d8ae45d5dcd1@kernel.dk> Date: Mon, 16 Feb 2026 08:17:31 -0700 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] io_uring: document advise SQE field reuse for 64-bit lengths To: redacherkaoui , io-uring@vger.kernel.org Cc: linux-kernel@vger.kernel.org References: <20260216113701.4650-1-redacherkaoui67@gmail.com> Content-Language: en-US From: Jens Axboe In-Reply-To: <20260216113701.4650-1-redacherkaoui67@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/16/26 4:37 AM, redacherkaoui wrote: > IORING_OP_FADVISE and IORING_OP_MADVISE reuse SQE fields to > support 64-bit lengths without extending struct io_uring_sqe. > > For IORING_OP_FADVISE, the length is carried in sqe->addr when > non-zero, with sqe->len providing legacy fallback. > > For IORING_OP_MADVISE, the length is carried in sqe->off when > non-zero, with sqe->len providing legacy fallback. > > This differs from the more common addr/off/len interpretation > used by many other opcodes and can be confusing when constructing > SQEs manually. > > Document the field mapping in the UAPI header to clarify the > intended behavior and reduce the risk of misuse. What is this patch against? Not the upstream kernel... -- Jens Axboe