linux-kernel - Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and waiter logic to load balance console writes

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Message-ID: <20180416161911.GA2341@sasha-vm>
Date:   Mon, 16 Apr 2018 16:19:14 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Byungchul Park <byungchul.park@....com>,
        Tejun Heo <tj@...nel.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and
 waiter logic to load balance console writes

On Mon, Apr 16, 2018 at 12:12:24PM -0400, Steven Rostedt wrote:
>On Mon, 16 Apr 2018 16:02:03 +0000
>Sasha Levin <Alexander.Levin@...rosoft.com> wrote:
>
>> One of the things Greg is pushing strongly for is "bug compatibility":
>> we want the kernel to behave the same way between mainline and stable.
>> If the code is broken, it should be broken in the same way.
>
>Wait! What does that mean? What's the purpose of stable if it is as
>broken as mainline?

This just means that if there is a fix that went in mainline, and the
fix is broken somehow, we'd rather take the broken fix than not.

In this scenario, *something* will be broken, it's just a matter of
what. We'd rather have the same thing broken between mainline and
stable.