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: <20180416133321.40a166a4@gandalf.local.home>
Date:   Mon, 16 Apr 2018 13:33:21 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
Cc:     Pavel Machek <pavel@....cz>,
        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>, Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and
 waiter logic to load balance console writes

On Mon, 16 Apr 2018 17:09:38 +0000
Sasha Levin <Alexander.Levin@...rosoft.com> wrote:

> Let's play a "be the -stable maintainer" game. Would you take any
> of the following commits?
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=fc90441e728aa461a8ed1cfede08b0b9efef43fb

No, not automatically, or without someone from KVM letting me know what
side-effects that may have. Not stopping on a breakpoint is not that
critical, it may be a bit annoying. I would ask the KVM maintainers if
they feel it's critical enough for backporting, but without hearing
from them, I would leave it be.

> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=a918d2bcea6aab6e671bfb0901cbecc3cf68fca1

Sure. Even if it has a subtle regression, that's a critical bug being
fixed.

> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=b1999fa6e8145305a6c8bda30ea20783717708e6

I would consider unlocking a mutex that one didn't lock a critical bug,
so yes.

Again, things that deal with locking or buffer overflows, I would take
the fix, as those are critical. But other behavior issues where it's
not critical, I would leave be unless told further by someone else.

-- Steve