Received: by 2002:a25:1985:0:0:0:0:0 with SMTP id 127csp795338ybz; Fri, 24 Apr 2020 09:23:55 -0700 (PDT) X-Google-Smtp-Source: APiQypKDdJBr4Cyg1nrUFvUIb7zQOaQIBGkUuexsNh1DTvJIolxM43UH6OEpz3Uzu8Od0EhONW6u X-Received: by 2002:a50:9f23:: with SMTP id b32mr7624149edf.183.1587745435449; Fri, 24 Apr 2020 09:23:55 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1587745435; cv=none; d=google.com; s=arc-20160816; b=HdIrDqqDD0ntgBpmyHmEaCmjdyZW+uVHdHW8Tl/95jtzcSP6c178Qd5olU3kfFc7Hs pPmHfPPUNlT4SM8WvsIE+xZODqCmWK2jWRj/8JzPTZ0TsDmXgdm94NKFMLuzP3kIQIgp 7XMgoj23+09d/OkYkK9vBqwA8DNPoelKrGS5I3L612b1NrHNs8UJ32rqsiuv0wLErPVa 3yW0dGsZbl0Gr9QEgltjDMOVv0bIY5cbEi8iU2ZEyb/GW17u3osOzSXAiNkChOptsoVS 94WengRZN2q1HRLgl9ODB/9Hxy8SZhMFuCB21S5kHpewrwbFgPKYtkXcRDMl/grRrMN7 /BQg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=lm6TguQxDjRhXd/NLfCd8cnq8mqI8R2zrW8nNdOqzcE=; b=Kc/VteWtfucN5H8SYKD0EymwIjh8G18jlntpJfEFnN1sXm0Rf20Ck1SV7eb2gjKGhn n5g0mZbZEopPY9ZP1ni3YSF6GwkI9uWb9ufXDoViprSc5pcbSUqQJW46GUQRIwWPM8Tq DMinFfEYhzcZBR/qwePhIMsyQkJzKepubTvnptn6IAclitveV9lBGDh0yvEvxe6qDHQg lkrcgZ3qPTeg5ULEj48mja5mAw+GyrzkDzpLyPWZG2vKOcjTczaxaLrg0LHEijCftjzQ mUFdzYwAtKCCeFvi1CZKK1CVG+J3p85FEpOJQcskMQW0zVKI70aFqwKiqAo505CDmjyV SDcA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id i13si3360826ejh.439.2020.04.24.09.23.31; Fri, 24 Apr 2020 09:23:55 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727819AbgDXQVt (ORCPT + 99 others); Fri, 24 Apr 2020 12:21:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:36194 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726908AbgDXQVs (ORCPT ); Fri, 24 Apr 2020 12:21:48 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CEFC520700; Fri, 24 Apr 2020 16:21:47 +0000 (UTC) Date: Fri, 24 Apr 2020 12:21:46 -0400 From: Steven Rostedt To: Tetsuo Handa Cc: Petr Mladek , Sergey Senozhatsky , linux-kernel@vger.kernel.org, Dmitry Safonov , Michal Hocko , Yafang Shao Subject: Re: [PATCH] printk: Add loglevel for "do not print to consoles". Message-ID: <20200424122146.163b1680@gandalf.local.home> In-Reply-To: References: <20200424024239.63607-1-penguin-kernel@I-love.SAKURA.ne.jp> <20200424092816.62a61b1d@gandalf.local.home> <579fbe97-9aae-2b67-03ff-01291b9cbb7d@i-love.sakura.ne.jp> <20200424103131.7987f890@gandalf.local.home> <7ec0b0a3-39ae-0f1c-b8c2-e1e9e60f1223@i-love.sakura.ne.jp> <20200424114225.5a3bab7e@gandalf.local.home> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 25 Apr 2020 01:10:15 +0900 Tetsuo Handa wrote: > KERN_NO_CONSOLES is a mechanism for implementing user decided policy. As long as > userspace can control whether to use KERN_NO_CONSOLES (e.g. sysctl), there should > be no problem with adding KERN_NO_CONSOLES (i.e. this patch) to the kernel side. How would you define what gets "KERN_NO_CONSOLES"? Is it going to be a sysctl switch? Also, how does one control the log level of prints with KERN_NO_CONSOLES? -- Steve