linux-kernel - Re: [ANNOUNCE] v5.11-rc4-rt1

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Date:   Fri, 22 Jan 2021 06:32:42 +0100
From:   "Ahmed S. Darwish" <a.darwish@...utronix.de>
To:     Pavel Machek <pavel@....cz>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v5.11-rc4-rt1

On Thu, Jan 21, 2021 at 09:50:08PM +0100, Pavel Machek wrote:
> Hi!
>
> > I'm pleased to announce the v5.11-rc4-rt1 patch set.
> >
> > Changes since v5.10.8-rt24:
> >
> >   - Updated to v5.11-rc4
> >
> > Known issues
> >      - kdb/kgdb can easily deadlock.
> >      - kmsg dumpers expecting not to be called in parallel can clobber
> >        their temp buffer.
> >      - netconsole triggers WARN.
>
> I noticed... lot of code using in_interrupt() to decide what to do is
> making it to 5.10-stable at the moment (and I guess that means
> vanilla, too).
>
> I have recollection that that is not okay thing to do. Am I right?
>

Correct. These macros should not be added to new, non-core, kernel code.

There's an on-going effort to clear them already, as in:

  - https://lkml.kernel.org/r/20201019100629.419020859@linutronix.de		(merged)
  - https://lkml.kernel.org/r/20201126132952.2287996-1-bigeasy@linutronix.de	(merged)
  - https://lkml.kernel.org/r/20210118100955.1761652-1-a.darwish@linutronix.de	(to be merged)

> Examples: 8abec36d1274bbd5ae8f36f3658b9abb3db56c31,
> d68b29584c25dbacd01ed44a3e45abb35353f1de.
>

That's sad.

Maybe it would be wise to let a bot scan lore regularly, and send an
automatic notification to authors whenever their patches reintroduce
these macros to non-core kernel code.

Thanks,

--
Ahmed S. Darwish