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[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: dm-devel@lists.linux.dev 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