From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE4E01A8F84; Wed, 15 Apr 2026 07:39:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776238743; cv=none; b=PO5mSfYH4gSZf0ujntiLFtcOjHCos4Qxxh1CDo49sxw23CZwNb87pda1I1O/K6KMXV4L/rw4nLyARn6JWYyq+EXcxihtXb4/3AM6LQWAA+pZQKmkgKOxKwy7lrjlyMCBJQHcs/FYRU1NTNlhsXYL/AX6DVnCXMwfi1cSICYNOh0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776238743; c=relaxed/simple; bh=D8IG/VXCfqcnsSgZAVBK8M5wjgHKHse8qQaQUHB5uFc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=hX81JfEBn4wU6Mwn1IFjiig4OJO0dHwzhJSGGX7hfcLPrRTF20vX+aZvZspwBJ0/keOfLJpC9Yg5qYMfoEVCOK6uZVSPXcNODXr99wU3txOdI5VIBM7boDPqbgmZmUyFI3f+UaKXOiaEHasCRmwITpkIzMkyJP9bpv/wcZSjx1M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=sfAIvHvJ; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="sfAIvHvJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=02523h4/XIkVhgJ/vZX6OsXKOEk8gdqo17d4C/+74kY=; b=sfAIvHvJxJpthG3Xc2imVY/Hny 3u+iheK16tltZrKVxY0W+Tqvi0LL6Wo2rGmYqg2NW7gFbWPrKjtlFkwux6bn2+pr3san/KDZLb4/L C6GtQrCUlMhNVTspr89p3YcZAtfJEN4hYMsJRuyiiVrnemtEm1lC6LY4wCWOqlqDCkqqANADpOqhM cxJH4fAp4cBQFZ/04Ft33u9X2TsbOruFO0jfu9hUnqCnkr1Ib+bnVz1bc020u+AqlHRT6lV+kPCTa KWM+LRMk+xz1Quqi0mss6p6k2rkspgW7gtGnhprWTZo2O+NY/r7uDgC89/KfdzRA0OUZ7foxyoJxg 4UQgbT3A==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1wCupi-00000000jwo-2mQw; Wed, 15 Apr 2026 07:38:46 +0000 Date: Wed, 15 Apr 2026 00:38:46 -0700 From: Christoph Hellwig 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 0/2] Decouple ftrace/livepatch from module loader via notifier priority and reverse traversal Message-ID: References: <20260413080140.180616-1-chensong_2000@189.cn> Precedence: bulk X-Mailing-List: live-patching@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260413080140.180616-1-chensong_2000@189.cn> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Mon, Apr 13, 2026 at 04:01:40PM +0800, chensong_2000@189.cn wrote: > From: Song Chen > > This patchset addresses a long-standing tight coupling between the > module loader and two of its key consumers: ftrace and livepatch. > > Background: > > The module loader currently hard-codes direct calls to > ftrace_module_enable(), klp_module_coming(), klp_module_going() and > ftrace_release_mod() inside prepare_coming_module() and the module > unload path. And that is bad why? > 13 files changed, 290 insertions(+), 74 deletions(-) This is a lot of new complex code touching a lot of places for no obvious gain. What is the reason for this series? Does it prepare for something else?