linux-kernel - Re: [PATCH 3.13 35/99] tty: Set correct tty name in active sysfs attribute

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Date:	Fri, 21 Feb 2014 17:01:28 +0100
From:	Kay Sievers <kay@...y.org>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Hannes Reinecke <hare@...e.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Lennart Poettering <lennart@...ttering.net>,
	Jiri Slaby <jslaby@...e.cz>,
	David Herrmann <dh.herrmann@...il.com>,
	Werner Fink <werner@...e.de>, Ray Strode <halfline@...il.com>
Subject: Re: [PATCH 3.13 35/99] tty: Set correct tty name in active sysfs attribute

On Fri, Feb 21, 2014 at 3:56 PM, Josh Boyer <jwboyer@...oraproject.org> wrote:
> On Fri, Feb 21, 2014 at 9:52 AM, Hannes Reinecke <hare@...e.de> wrote:
>> On 02/21/2014 03:48 PM, Josh Boyer wrote:
>>> On Thu, Feb 20, 2014 at 6:52 PM, Greg Kroah-Hartman
>>> <gregkh@...uxfoundation.org> wrote:
>>>> 3.13-stable review patch.  If anyone has any objections, please let me know.
>>>>
>>>> ------------------
>>>>
>>>> From: Hannes Reinecke <hare@...e.de>
>>>>
>>>> commit d8a5dc3033af2fd6d16030d2ee4fbd073460fe54 upstream.
>>>>
>>>> The 'active' sysfs attribute should refer to the currently active tty
>>>> devices the console is running on, not the currently active console.
>>>>
>>>> The console structure doesn't refer to any device in sysfs, only the tty
>>>> the console is running on has.  So we need to print out the tty names in
>>>> 'active', not the console names.
>>>>
>>>> This resolves an issue on s390 platforms in determining the correct
>>>> console device to use.
>>>
>>> Just to be double sure this is seen, Ray points out that it breaks
>>> current plymouth because the heuristic changed.  Hold off on this one?
>>>
>> Without this patch systemd won't present a login console for s390.
>> I'd prefer fixing plymouth.
>
> Sure.  Except fixing plymouth is easy to do, but not easy to actually
> get deployed on all of the old userspace.  So if someone runs a 3.14
> kernel on any distro that doesn't have a fixed plymouth, it's broken.
> By including this patch, you're basically trading one broken userspace
> component for another.
>
> Is there some other way this could be fixed in-kernel that would allow
> both to work?

Why did the tty0 change to tty1 now? That doesn't look like a "driver
name" vs. "device name" issue?

Kay
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