From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jon Masters Subject: Re: The console log is doubled if earlycon is enabled Date: Mon, 21 Dec 2015 02:54:39 -0500 Message-ID: <5677B03F.1030506@jonmasters.org> References: <20151128000451.GB22297@kroah.com> <20151130171034.GA14366@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20151130171034.GA14366@kroah.com> Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman , Masahiro Yamada Cc: linux-serial@vger.kernel.org, Linux Kernel Mailing List , Peter Hurley , Rob Herring List-Id: linux-serial@vger.kernel.org On 11/30/15, 12:10 PM, Greg Kroah-Hartman wrote: > On Mon, Nov 30, 2015 at 02:53:49PM +0900, Masahiro Yamada wrote: >> 2015-11-28 9:04 GMT+09:00 Greg Kroah-Hartman : >>> On Fri, Nov 27, 2015 at 07:21:06PM +0900, Masahiro Yamada wrote: >>>> Hi, >>>> >>>> >>>> If I add "earlycon" to the kernel parameter, the log message >>>> on the earlycon is also displayed to the regular console. >>>> In other words, the same log messages are displayed twice. >>>> >>>> I noticed this problem on v4.4-rc1. >>>> It has not been fixed in the mainline yet, I think. >>>> >>>> Anybody who has a clue? >>>> (I have not done git-bisect yet.) >>> >>> Can you do 'git bisect'? >> >> >> The same problem happened on v4.3. >> (I think I just did not notice the problem before.) >> >> So, the bad commit is not in the last merge window. > > Is it ok for 4.2? 4.1? Finding out where this started to "fail" would > be good to know... Just as a data point, on our internal systems earlycon is known good in combination with regular console (provided by SPCR ACPI patch) on 4.2. Jon.