linux-kernel - Re: [PATCH v2 10/13] EDAC/altera: Skip the panic notifier if kdump is loaded

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Message-ID: <612c2d54-59db-9d2c-cea3-2ffcfcaffec9@igalia.com>
Date:   Sun, 7 Aug 2022 12:48:36 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     kexec@...ts.infradead.org, Tony Luck <tony.luck@...el.com>,
        Dinh Nguyen <dinguyen@...nel.org>, linux-edac@...r.kernel.org
Cc:     akpm@...ux-foundation.org, bhe@...hat.com,
        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, pmladek@...e.com
Subject: Re: [PATCH v2 10/13] EDAC/altera: Skip the panic notifier if kdump is
 loaded

On 19/07/2022 16:53, Guilherme G. Piccoli wrote:
> The altera_edac panic notifier performs some data collection with
> regards errors detected; such code relies in the regmap layer to
> perform reads/writes, so the code is abstracted and there is some
> risk level to execute that, since the panic path runs in atomic
> context, with interrupts/preemption and secondary CPUs disabled.
> 
> Users want the information collected in this panic notifier though,
> so in order to balance the risk/benefit, let's skip the altera panic
> notifier if kdump is loaded. While at it, remove a useless header
> and encompass a macro inside the sole ifdef block it is used.
> 
> Cc: Dinh Nguyen <dinguyen@...nel.org>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
> 
> ---
> 
> V2:
> - new patch, based on the discussion in [0].
> [0] https://lore.kernel.org/lkml/62a63fc2-346f-f375-043a-fa21385279df@igalia.com/
> 
>  drivers/edac/altera_edac.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> [...]

Hey Tony / Dinh, do you think this patch is good, based on the
discussion we had [0] last iteration?

Thanks in advance,


Guilherme


[0]
https://lore.kernel.org/lkml/599b72f6-76a4-8e6d-5432-56fb1ffd7e0b@igalia.com/