From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C894C43334 for ; Fri, 8 Jul 2022 19:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239232AbiGHTEk (ORCPT ); Fri, 8 Jul 2022 15:04:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230405AbiGHTEi (ORCPT ); Fri, 8 Jul 2022 15:04:38 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35C1925295 for ; Fri, 8 Jul 2022 12:04:38 -0700 (PDT) From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1657307076; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ycbHxgjBmZtCvpAyK4XSXGKKv36UVtTn3WZRrsj75eE=; b=2ChjxV+at8O99xZnEdzd/9iVpL7m5o79cSG84nkImQkrSOcTO2CCdc24PN2IHTfp9cQc2r 7uyh0mJyJv4LFkUMU7pzaMofU7eGPb+kPR2c45YfB/j5UY5vXaplHRMz096jOp4nW/8QL1 fim1iO8CVmoby0iV/s0rhnrdY9cz+OWb+ep2cSZrK3zC8okqmRWLbGkPelyelN6fXh7OZG 9kOHHhYokRng5m5ByWl/7OBzivF54Gj+Pk9lZXWbRTm39JrarqA1ueafwz0XaM+U0OpUKl ooTakEoP1p+oqBIVdlGTebmY8eVDhxkpSVK/lDV8H+bMxGfXyzimqkUNSLnj8Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1657307076; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ycbHxgjBmZtCvpAyK4XSXGKKv36UVtTn3WZRrsj75eE=; b=6EokXp0+KiMacdaQo5Cmzqcj3EgHNutiemScPCuFRzvsniFepKAz5uFQefqTDjJjBV8nTq KxViJ1OArpE6grCw== To: Petr Mladek , Chris Down Cc: linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Sergey Senozhatsky , Steven Rostedt , Geert Uytterhoeven , kernel-team@fb.com Subject: Re: design: was: Re: [RFC PATCH v2] printk: console: Allow each console to have its own loglevel In-Reply-To: References: Date: Fri, 08 Jul 2022 21:10:35 +0206 Message-ID: <87o7xz5su4.fsf@jogness.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2022-07-08, Petr Mladek wrote: > The console-specific loglevel might be set by: > > + "console=device,options/loglevel" kernel parameter at boot time I ask if we avoid the use of "/loglevel" and instead use a generic scheme of: console=device,option,option,option Of course, it would mean that the type of option would need to be specified. Something like: console=ttyS0,115200n8,loglevel=3 The reason why I make such a request is because I would like to be able to support disabling threading for certain consoles. Something like: console=ttyS0,115200n8,nothread or when we have atomic consoles that we can specify that they are always used with a "sync" option: console=ttyS0,115200n8,sync This is not the time to discuss what those strings should be. The point is that we should use a syntax that allows adding more options for the future. Linus already [0] showed some approval to this method of option extending as I suggested the "mute" option to have consoles keep quiet. John Ogness P.S. FWIW, I think this is a nice feature. I even mentioned it in my LPC2019 printk talk, as there were previous efforts [1] to get this feature implemented. [0] https://lore.kernel.org/lkml/CAHk-=wif0QueN8ovkm_x7TsOgOHjRrOa4wU-zHgBP=FTAnzvNA@mail.gmail.com [1] https://lore.kernel.org/lkml/bc1fe800930be76761b2bb4e6108fe5876a005c9.1491345440.git.calvinowens@fb.com