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[209.132.180.67]) by mx.google.com with ESMTP id j16si19071909otq.23.2020.01.19.04.56.59; Sun, 19 Jan 2020 04:57:11 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@freesources.org header.s=20160526 header.b=jgifXcMy; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=freesources.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726894AbgASM4I (ORCPT + 99 others); Sun, 19 Jan 2020 07:56:08 -0500 Received: from mx3.freesources.org ([195.34.172.217]:38366 "EHLO mx3.freesources.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726816AbgASM4I (ORCPT ); Sun, 19 Jan 2020 07:56:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=freesources.org; s=20160526; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=RDwkT16f4BTGNZWIgoJRcBzp0A3cT69/W17cKcdQkqY=; b=jgifXcMyGv58JH76XadtVK9s1H 4TgA/0TkCJlKEZWFvDIW+SBO9p2N03mO9r8cE4786+2ksiuNsDu7BZ4bDm2+Fl9ViOrrm76MgZ924 +Kr//HmmC91cXQFQ/gK3wEnbCVcFU88fVVPikSb6LXxhnjgF937y4YDGFmL0lmeHI0hQ=; Received: from anon-43-243.vpn.ipredator.se ([46.246.43.243]) by mx3.freesources.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1itA7V-0000pz-4i; Sun, 19 Jan 2020 12:56:01 +0000 Subject: Re: [PATCH v3] PM: suspend: Add sysfs attribute to control the "sync on suspend" behavior To: "Rafael J. Wysocki" Cc: "Rafael J. Wysocki" , Linux Kernel Mailing List , Linux PM , Pavel Machek , Len Brown , Tim Dittler , Yannik Sembritzki References: From: Jonas Meurer Autocrypt: addr=jonas@freesources.org; prefer-encrypt=mutual; keydata= mQINBEqFXAEBEAC+7gfLht8lDqGH1EPYoctDHvWQ4nk60UFDLfjqHmBGReL/9C7CyxYaqgY4 V1/DXPCmsO5PvHMSi6VPn3B81alPKMT6syQhxDN6CXETh/mrxRbTPyQVSKYdD/BvA94vgwfy iInR0N7K6J/mRxqKug14vXlABvfmyWBnW89d15OWs9qy1Ge1mHaA8UgIoUInR2mMqNHQf0nF /TtClN2uPmtv/GeGHfSSCQEjYq9Ih2Z1Re2hnwW1peEc0x7piKUXCXHGyrQdz5IE69SqV1gg vafUrWHNPWz5ZtXsihYioNi3ISuoHUjkKdn+t55en5tvWvi+2JQnMCGa/Wr7iA2EOxallR+z rQRBDe/6wp1XEz6vN1LqCeaRyVOR6q00PtN/Ot0tzPswrHKE6binqG6FBRbu+zeo87cNbMmH IAdIT3ysZCAwA2g310fBByCSiNnfhHg2GyqfC4eDtL/K7uVNqQQEon0yv8lzyUloofKER8eA W4PtahGcLLbREnekAwQMpU8y1a++QXdk1ckLoyGuBVpBX8PiRirzYVmYsGRMK2u0yIy73YYM gYpt6h+Vaoj5EyPbYuJRm3RItByzE84YBbKfA81Xn8FZWc2qTyTeKRMioTu37E/z46wSHCt9 UM89/lSz5iplUhnmdrN+u606MDbAdgxR5Lk+1UuhpPgLxIIdPwARAQABtCRKb25hcyBNZXVy 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X7C06ieTtQXoIk3dO+XwnsLl5NcwMlga1sdbM0OQARMKbtKCXRkwWyCaHQI0ei756kUsNCK6 ZLe3s705sJ77gVwVdUE6Y5255z2r9MH00QdJk7p/5Axa22qda59Vo/7wxXO9M1tI1WUunWQ+ /xNvnLsCvwVnprx9YDsQ18FaKEX+mc0yOzwKhWpT1IVShck8o1kshaaTmB1u/ZbZBgoFYcrS 30kvqVaabEbcuKmkUNTP0h4ewXdpFlx8HoUn/D+etqFR/sdZtzaSYo7F7NAf5ORb5NIyZQTf j5MR0b5PT03y/FxsG+LYDhQGxL3ZWtmPYiDT8W3BExwRg4VkRKuPVM/qDhur45CuqwNZXDQX ucOyOCxbGK0rfZasgPXkzxTWohgQwhBvw+eZ+VXzjHiRyGQ4x1Jay9eYiw7QeOiLDQxQcxLI tAzfoD+TN75zyJrLjknLC+udmMVZMcserZHCUnb9WBW4qMNyy9PI53Ha6bvfZXbZCeS3PjTo 2SCIHpzHfm/mpRL2 Message-ID: Date: Sun, 19 Jan 2020 13:55:58 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hey Rafael, Rafael J. Wysocki: > On Thu, Jan 16, 2020 at 12:53 PM Jonas Meurer wrote: >> >> The sysfs attribute `/sys/power/sync_on_suspend` controls, whether or not >> filesystems are synced by the kernel before system suspend. >> >> Congruously, the behaviour of build-time switch CONFIG_SUSPEND_SKIP_SYNC >> is slightly changed: It now defines the run-tim default for the new sysfs >> attribute `/sys/power/sync_on_suspend`. >> >> The run-time attribute is added because the existing corresponding >> build-time Kconfig flag for (`CONFIG_SUSPEND_SKIP_SYNC`) is not flexible >> enough. E.g. Linux distributions that provide pre-compiled kernels >> usually want to stick with the default (sync filesystems before suspend) >> but under special conditions this needs to be changed. >> >> One example for such a special condition is user-space handling of >> suspending block devices (e.g. using `cryptsetup luksSuspend` or `dmsetup >> suspend`) before system suspend. The Kernel trying to sync filesystems >> after the underlying block device already got suspended obviously leads >> to dead-locks. Be aware that you have to take care of the filesystem sync >> yourself before suspending the system in those scenarios. >> >> Signed-off-by: Jonas Meurer > > Applied as 5.6 material with minor changes in the ABI document, thanks! Wow, that's great news. I'm excited to read that the patch finally will enter the Linux kernel \o/ Thanks a lot for guiding me through my first Linux kernel patch contribution. Cheers jonas