linux-kernel - Re: [PATCH v2 06/13] um: Improve panic notifiers consistency and ordering

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Date:   Tue, 09 Aug 2022 20:09:23 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        kexec@...ts.infradead.org, linux-um@...ts.infradead.org
Cc:     pmladek@...e.com, bhe@...hat.com, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        netdev@...r.kernel.org, x86@...nel.org, kernel-dev@...lia.com,
        kernel@...ccoli.net, halves@...onical.com, fabiomirmar@...il.com,
        alejandro.j.jimenez@...cle.com, andriy.shevchenko@...ux.intel.com,
        arnd@...db.de, bp@...en8.de, corbet@....net,
        d.hatayama@...fujitsu.com, dave.hansen@...ux.intel.com,
        dyoung@...hat.com, feng.tang@...el.com, gregkh@...uxfoundation.org,
        mikelley@...rosoft.com, hidehiro.kawai.ez@...achi.com,
        jgross@...e.com, john.ogness@...utronix.de, keescook@...omium.org,
        luto@...nel.org, mhiramat@...nel.org, mingo@...hat.com,
        paulmck@...nel.org, peterz@...radead.org, rostedt@...dmis.org,
        senozhatsky@...omium.org, stern@...land.harvard.edu,
        tglx@...utronix.de, vgoyal@...hat.com, vkuznets@...hat.com,
        will@...nel.org, Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Richard Weinberger <richard@....at>
Subject: Re: [PATCH v2 06/13] um: Improve panic notifiers consistency and
 ordering

On Sun, 2022-08-07 at 12:40 -0300, Guilherme G. Piccoli wrote:
> On 19/07/2022 16:53, Guilherme G. Piccoli wrote:
> > Currently the panic notifiers from user mode linux don't follow
> > the convention for most of the other notifiers present in the
> > kernel (indentation, priority setting, numeric return).
> > More important, the priorities could be improved, since it's a
> > special case (userspace), hence we could run the notifiers earlier;
> > user mode linux shouldn't care much with other panic notifiers but
> > the ordering among the mconsole and arch notifier is important,
> > given that the arch one effectively triggers a core dump.
> > 
> > Fix that by running the mconsole notifier as the first panic
> > notifier, followed by the architecture one (that coredumps).
> > 
> > Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
> > Cc: Johannes Berg <johannes@...solutions.net>
> > Cc: Richard Weinberger <richard@....at>
> > Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
> > 
> > ---
> > 
> > V2:
> > - Kept the notifier header to avoid implicit usage - thanks
> > Johannes for the suggestion!
> > 
> >  arch/um/drivers/mconsole_kern.c | 7 +++----
> >  arch/um/kernel/um_arch.c        | 8 ++++----
> >  2 files changed, 7 insertions(+), 8 deletions(-)
> > [...]
> 
> Hi Johannes, do you feel this one is good now, after your last review?
> Thanks in advance,
> 

Yeah, no objections, my previous comment was just a minor almost style
issue anyway.

johannes