From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f47.google.com (mail-wm1-f47.google.com [209.85.128.47]) (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 37F6A2862BE for ; Wed, 19 Feb 2025 01:29:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.47 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739928544; cv=none; b=XYsXvNPbt4Ww/RaZ3FDFZoXpdK8fmtC0QtvvNpLsLySdJdtoR2OyYsKgPutNimwJDO/BQHCiApHvE5hPkzoov4AY+PnVASavARF5H5MiZfTTKAHYfuuY6hFnpMjuefnRnShO9ZGXwXppwWc+2eNwGTvDxQaUG5dL852Y9j52VhE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739928544; c=relaxed/simple; bh=VPCUWab+aUzTp3dDUpPCkq1A3cn8DBb+mpRk1y8SSDY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=X5DFn6zOTNc5G7S3UCl5oiEU1mbgaOjYNOruLxO210Cx8v2r+H1470NQxIVuILOq6CV3D+WPCL5xsveu+YXYvQRqwR5fGd+l9DmFbwGGkO+6csHI0aTw1w3SYpETh3BrL61NXRjesDqOyutB6RTU98gkNWQyc7CkzOyb331V/5U= 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=K5xz0THW; arc=none smtp.client-ip=209.85.128.47 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="K5xz0THW" Received: by mail-wm1-f47.google.com with SMTP id 5b1f17b1804b1-4394345e4d5so42531125e9.0 for ; Tue, 18 Feb 2025 17:29:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1739928541; x=1740533341; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=7R3jhZYi++/ByHk1wh0bji6TXKixSvxzAdkrA+htOAk=; b=K5xz0THWzZuhP1ItSwIGBHDOarH2joIOvicefhWVcUDgOximL52lYIBMdAUKCrg2wV txkC9XKawBs3yULA7/N4IzQU2WDt2zM60+WfGndiOgVUXXc9meOeTF6D2uTFB5aQ08ic PKy9FjOfK6qQhlD9blMJpSiddzqJn0uj5LkyTiHk/oR4aTU8TOsv0Lre8mw8+XuPX75T 1IJWj5j8ar+2pfTygy30qF5U/6w6z39SxYf6w01UfpU1z0QvjMR1oXezkDsu4wGNNLES 2Am93pAd0JoiCNlSJkGAXosc+40dA0ML7Q9XAZ8JSEPNmivP5uZ0CiO1Rk0zS7BvnSct xHog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1739928541; x=1740533341; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=7R3jhZYi++/ByHk1wh0bji6TXKixSvxzAdkrA+htOAk=; b=GhwqJk8SEW/zG60APgatzBFrHWkWMMHzFhhjQNtAZ1IlVDYy5KmQmb2I8nUOUFxGCI WW84y32btYtUtghINOTPaHFLWvEZvOCZ89LcgCl5P4jY9fSiBAvJ/t4Of4OomoJi5zL2 t8fDX3PEVhv8luU0cvOO/7TBFXlAxrvNOenAUjsRFnbwh53jgijBzJwoPwH/zHFLfB5x 4FrIHzJE9Z3vw39o4sXLsT0MVWW2rqBUAX/VnlM/N143LDJYImis+APkpV5NS7q/OUKQ QvbxbyfZYbXLnBbV83RpKF6IeEzbYK5qPwoRweaEzNv6F82Ve8HMoyxGTKBno2cE8j41 8hDg== X-Gm-Message-State: AOJu0YxGciJd+FjoX4xxlYyNnwcYmEp9pWp5nZREsFDsh6X4qPoTgr9b 5B012ASlO09bAfcDOGyfAvSX+TU0709Tm6g3xw+H3FVfA+1nDJ+qKb1JqQ== X-Gm-Gg: ASbGnctEyd+FAHSXV04AFRQiEWX8AFc+ahKPMICjb+1Pi67c+7+V/iRrt6XgyE8/BGx tlTeL2vgxU6JwEGjEoO4gKs9QO+xdzrJxnhS//Ism8aSXs5NmUXD1ZTAyJRlYWEuoLUA+ZPcJkO rK/EIAP6YXroA3LM+DC/tglqzB6nqLV+2GD+BPp0+UUjZMj/3ggZh2o2XRj8GrPh6PEVfV6wm7L jojOTY5OwW5kNb6g2niEuN/HWUtTOIE0eXCVfF8BaeahFFxKAOr005wBkBYoK7KmoLI2yrwHRxF 1ZOebDDkvdlIAUf8ftTpfKQl X-Google-Smtp-Source: AGHT+IHxnavgAVkldWc4njrNR3mNBW88fFEaljuvezAExXTtezglGhkVtvkaPUcGlBSSeIpKr07x3w== X-Received: by 2002:a05:600c:4f47:b0:439:9377:fa22 with SMTP id 5b1f17b1804b1-4399377fc5bmr44392475e9.18.1739928540828; Tue, 18 Feb 2025 17:29:00 -0800 (PST) Received: from [192.168.8.100] ([185.69.145.170]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4395a04f8a2sm197065365e9.2.2025.02.18.17.28.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Feb 2025 17:28:59 -0800 (PST) Message-ID: Date: Wed, 19 Feb 2025 01:30:04 +0000 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6.12.y 6.13.y] io_uring/kbuf: reallocate buf lists on upgrade To: stable@vger.kernel.org Cc: Jens Axboe , Pumpkin Chang References: <2025021855-snugly-hacked-a8fa@gregkh> Content-Language: en-US From: Pavel Begunkov In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/19/25 01:28, Pavel Begunkov wrote: > [ upstream commit 8802766324e1f5d414a81ac43365c20142e85603 ] > > IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it > was created for legacy selected buffer and has been emptied. It violates > the requirement that most of the field should stay stable after publish. > Always reallocate it instead. Just a note that it should apply to 6.13 and 6.12, can you pick it for both of them? -- Pavel Begunkov