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[209.132.180.67]) by mx.google.com with ESMTP id q16si37393976pgk.405.2019.04.12.00.18.58; Fri, 12 Apr 2019 00:19:14 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726923AbfDLHSS (ORCPT + 99 others); Fri, 12 Apr 2019 03:18:18 -0400 Received: from mout.kundenserver.de ([212.227.126.134]:39019 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726061AbfDLHSS (ORCPT ); Fri, 12 Apr 2019 03:18:18 -0400 Received: from [192.168.1.110] ([77.9.22.14]) by mrelayeu.kundenserver.de (mreue011 [212.227.15.167]) with ESMTPSA (Nemesis) id 1N5mWp-1gnDLm3t51-017GnO; Fri, 12 Apr 2019 09:17:30 +0200 Subject: Re: [PATCH] tty: Add NULL TTY driver To: "Adamski, Krzysztof (Nokia - PL/Wroclaw)" Cc: Vincent Whitchurch , Greg KH , "jslaby@suse.com" , "linux-kernel@vger.kernel.org" References: <20190403113327.3628-1-vincent.whitchurch@axis.com> <20190403131213.GA4246@kroah.com> <20190403141109.3mdmqbt3mjxrie6k@axis.com> <20190405090043.vnsftwpdm56cx2hr@axis.com> <20190411130458.GA11390@localhost.localdomain> From: "Enrico Weigelt, metux IT consult" Organization: metux IT consult Message-ID: Date: Fri, 12 Apr 2019 09:17:28 +0200 User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <20190411130458.GA11390@localhost.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K1:qyehZw4BxFk0EO6zWqfZLo+RVqSCdP13a+fDHUYtMLpXvZmb1V7 Uf8rxcfwsa+Is2nUXaMYrKL59zcMQLpmPKwnA09g/mwFr/2pNhUokBoMajczvn3uk2xbZjC i75NxWRvdPHOfJQITlt/zyt0yUO2uUFnXcw9uGci3D+VmGJotav4EHOdUa19zYmiwy85m4V 6psMZrBfZ2IfkqyWrty+g== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:907ZcZ8n834=:C4LhqoM3TQG9w8qqzWPGMf MPrkSdammynho9pr4IpsNLSZpLa+4CLq0OE+DeTsLgxw8Alyhqv5V/fTsixhfYm8h4wy93yAr Nv03iNFPUyxIx0W+7/hO9mctH80ar9A93E6jbaY+xBG0AT1OFQOu0qFUxBjRz8QNYJnekAK3Q isU+Mboe7VZOa81azFn4v0CMjpVIlz/Cb7xuqRoTczi9k8PiaIiyKerYnEK4ehZgZ8D3z9ujl UKP3WbPy+Bsc4rJlGiaioS3O3T672y3VemDvXJLptsUJQP1f9zBgRFZI1NCkSJuP38wVJLuIG uBw/KEVc27dRuu6+7ywY86GqM3Hhtr1n2GgY2rPTah/dOiG+Uzj0lPU9Ikexl4hgEpwxLOdpU GxkbVl836D0ExTCHRf9kO+zpw8P0HbSdeyfv0W03zVfphJCD0rI8N1YufQKeYcadKJEwynxxz gd4aUzOOBOfTeZBU/e/C321erOxk8kc/nT2c+KgaNWLkIg5ui7Dh9cZTYCPFTwCyCh2ezzwLx JhRkltL7194IXYne0qcxYKPRkcWokPrbqTP60EDZlHgbj3bDdCZHcUuYTT2Ze9ndsNApM/Uux K151IScG4jjeNNhVXHehHkouzA8Fug1DwXXY7cvYbQIz6waZk0NakisYDxhWV2wsy1oXSN3GB ZeXJned62K+pDSK8GkCJXid8RjdQn6sQ7OrvgoG+gH6FRFMVPlQyUqpdbeEusHLvorjq6CepK rjvEGiGa0W/849Fb5nSgSmFlGZIDqLEusV9AqNypxHysBR2/GSsS8EYN0e4= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11.04.19 15:05, Adamski, Krzysztof (Nokia - PL/Wroclaw) wrote: > There are (embedded) cases where the kernel ring buffer is stored for> log inspection and all the logs that are *not* wanted there (like> interactive debug logs, some progress bar, etc) are send specifically to> /dev/console to avoid sending them to normal log store (as they are only> useful when debugging over console). In non-debug mode /dev/console> becomes /dev/null to speed things up. So, in your case, it doesn't need to be an actual tty, any file/chardev already do it, correct ? But then, why is that new driver needed ? --mtx -- Enrico Weigelt, metux IT consult Free software and Linux embedded engineering info@metux.net -- +49-151-27565287