From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (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 E8A163B893C for ; Thu, 16 Apr 2026 12:30:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.45 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776342611; cv=none; b=TDzD/WEadYqKEEDzSQEWvn7262Mk22U1mQFkW7xuXeDtQ7NT7FNSw8SyV8vCVBhXRPhaRym1PVKkPmyoTVxkNhKrnWxYa5uSW2JeaqX9rNkpw2eB6p5fppwXqMynyk/6UA98VphgRCIbnnozjUQBIko2Kkv5P02kBwYDwACxBAs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776342611; c=relaxed/simple; bh=K/4afwQ5p31SSvbXjWdzi0L0oqupXfEEFTghGQ4JcSM=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IXGXZyyemKhVkgbj0w9PX38MOP9yETk3YA+5jeYs4rN0WI7ux78p767C1d5pxCViO/ArxCc37SpQ1EBqT9LiTeZF4hfiMs550sZHJmcMurq1UcQgK3ntYyERjNUvbQmdktV9UJ+AFfjCKfBSASZ1X0cwLaXMOnefmkqNGOSyido= 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=SMyIhcMB; arc=none smtp.client-ip=209.85.128.45 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="SMyIhcMB" Received: by mail-wm1-f45.google.com with SMTP id 5b1f17b1804b1-488ba6366a7so95599835e9.0 for ; Thu, 16 Apr 2026 05:30:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1776342607; x=1776947407; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=wD5n29vJmomxS6DITZYPjUM6os1Itf/93DfNIu2KPog=; b=SMyIhcMBhud7E9S0oZfY4dPtDZqiIEqLPYjB6s4KMU/0r83YLgF5ZbDmBOKyocj9ZY qrYE7AXH6tRIrCBZ2stUl3Qi0p1ekSMzV/bw635qeh1plkYWcNycJtCcJhUXvLmdYZkQ ak84/JBnez1KRfcmlMpgZ++CuFvu085GXxYYRhr73LFU4mA8rLyuOYJFvhMOOSuhDheC cVlzWB5L4UqeH/Dt9xlmzSUVQmUeJPE5kIcqSfdNeq+fT/ncidGLUeITziIc3LIGoSlb mIEymQGy7PCqcWSexrvq+2z77t5rI8LX0YHsKA3o8o949yKU9SPV8ckeT8kyG1heRNFK DfaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776342607; x=1776947407; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=wD5n29vJmomxS6DITZYPjUM6os1Itf/93DfNIu2KPog=; b=PV8AgnuEoRR6pD9X2MNEInV6r/jLuuIPg0mCGmDvc67QcK1JTsRc5OM8P/Mjg5nhvH iGRaZ4k5QCJ7MKI0QNcABVaUYuuzlDjF6TQ4X5Ht2gPxi3nBI/aBvqb0AWAtBc1PJCu3 JZ/TpKx38ZRd4Xy7F8JtWLaf7N7QsMn0Yad2K7tIp4j8qWQZ7zRO1jAJwn0P5KjDRYwb Glqwfk4rHRnnWZlfR7Bi2YiZeJ4u7kQX+JiqxNGmgpyvDF8JMC5svpUF0qeTrOVROaTg MiA6srMxdbzNrMt9pQip3HHz0qYnV2zaJZVlgGMur2Z56SfmIqYyVREjoY+6bOOPaK6e 4F0g== X-Forwarded-Encrypted: i=1; AFNElJ/4UCiZFjJ5l6+m4dvn/AcseaFQNk4AkL0h+1RNdpDuFcOsmIjdtozceQbaIk24Vf44jQzwI7qIhwx979o=@vger.kernel.org X-Gm-Message-State: AOJu0YzCdPohhjua7+TkBDvf1uvexdnFB7oMw9lH6nebLNZPD3MsFFlQ jP48vgVOabaIvpCyPIt4VKwbTemcc5hFVzOKpObi2c0FXKGktYiGX8BB X-Gm-Gg: AeBDietn1IWPdvYxatfCtmOsYWbHJJYc1ds1PiG6MQ+50GMJ36z6VoGeSD0m7HBPdIK KMuO5gPj3Ql7pSuoRg+aypqYvpZW8/fHo5vOGxTXCSnU2kUZsNW9j98raXFdm+TuNeSeewCKwNl w4QIMD4Zu5E2rx8IVyhys7qGLQKCemlHlawis/d59M6RxWGkanXSP0G9oozz+JKLuyahlR4Wzx3 7+kXlZi2i11aLTEa6I171mrV/8ixAHOt4hzz+DZ8UQAKL7IcUXE3SaOPSGeq/fxxxFV/Zdm48P0 T1rsVaXDWsXWuqhGrxPWTuqz5EWMB/5I4A3LoxYsuw0omqPnP/FFQpGi1hdrqziyshgAQa7wZWO 5RTIKTG2+L/ft3jOnMYvvkJu7t7Gk8Fs8bhZb/+RmyIKXADBZp120KqqEpUiNECq4eOnbY7gSrg Z5r6MhSxKiut+fhDTdXmkBfWvMOYBQXdMXFnBvPF1dreUjTIh3Fqi4ArSK8RCRjouw X-Received: by 2002:a05:600c:45ce:b0:485:3e19:9e01 with SMTP id 5b1f17b1804b1-488d6890c9dmr355637165e9.28.1776342606991; Thu, 16 Apr 2026 05:30:06 -0700 (PDT) Received: from pumpkin (82-69-66-36.dsl.in-addr.zen.co.uk. [82.69.66.36]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488f0e9c668sm69981255e9.4.2026.04.16.05.30.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Apr 2026 05:30:06 -0700 (PDT) Date: Thu, 16 Apr 2026 13:30:04 +0100 From: David Laight To: chensong_2000@189.cn Cc: rafael@kernel.org, lenb@kernel.org, mturquette@baylibre.com, sboyd@kernel.org, viresh.kumar@linaro.org, agk@redhat.com, snitzer@kernel.org, mpatocka@redhat.com, bmarzins@redhat.com, song@kernel.org, yukuai@fnnas.com, linan122@huawei.com, jason.wessel@windriver.com, danielt@kernel.org, dianders@chromium.org, horms@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, paulmck@kernel.org, frederic@kernel.org, mcgrof@kernel.org, petr.pavlu@suse.com, da.gomez@kernel.org, samitolvanen@google.com, atomlin@atomlin.com, jpoimboe@kernel.org, jikos@kernel.org, mbenes@suse.cz, pmladek@suse.com, joe.lawrence@redhat.com, rostedt@goodmis.org, mhiramat@kernel.org, mark.rutland@arm.com, mathieu.desnoyers@efficios.com, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-clk@vger.kernel.org, linux-pm@vger.kernel.org, live-patching@vger.kernel.org, dm-devel@lists.linux.dev, linux-raid@vger.kernel.org, kgdb-bugreport@lists.sourceforge.net, netdev@vger.kernel.org Subject: Re: [RFC PATCH 1/2] kernel/notifier: replace single-linked list with double-linked list for reverse traversal Message-ID: <20260416133004.07bd2886@pumpkin> In-Reply-To: <20260415070137.17860-1-chensong_2000@189.cn> References: <20260415070137.17860-1-chensong_2000@189.cn> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 15 Apr 2026 15:01:37 +0800 chensong_2000@189.cn wrote: > From: Song Chen > > The current notifier chain implementation uses a single-linked list > (struct notifier_block *next), which only supports forward traversal > in priority order. This makes it difficult to handle cleanup/teardown > scenarios that require notifiers to be called in reverse priority order. If it is only cleanup/teardown then the list can be order-reversed as part of that process at the same time as the list is deleted. David