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

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Message-ID: <5bbc4296-4858-d01c-0c76-09d942377ddf@igalia.com>
Date:   Sun, 7 Aug 2022 12:40:17 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     kexec@...ts.infradead.org, linux-um@...ts.infradead.org,
        Johannes Berg <johannes@...solutions.net>
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 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,


Guilherme