linux-kernel - Re: [PATCH V3 08/11] EDAC/altera: Skip the panic notifier if kdump is loaded

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Message-ID: <742d2a7e-efee-e212-178e-ba642ec94e2a@igalia.com>
Date:   Sun, 18 Sep 2022 11:10:47 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     bhe@...hat.com, kexec@...ts.infradead.org,
        Dinh Nguyen <dinguyen@...nel.org>,
        Tony Luck <tony.luck@...el.com>, linux-edac@...r.kernel.org,
        bp@...en8.de
Cc:     pmladek@...e.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, 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, xuqiang36@...wei.com
Subject: Re: [PATCH V3 08/11] EDAC/altera: Skip the panic notifier if kdump is
 loaded

On 19/08/2022 19:17, 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: Borislav Petkov <bp@...en8.de>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Tony Luck <tony.luck@...el.com>
> Acked-by: Dinh Nguyen <dinguyen@...nel.org>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
> 
> ---
> 
> V3:
> - added the ack tag from Dinh - thanks!
> - had a good discussion with Boris about that in V2 [0],
> hopefully we can continue and reach a consensus in this V3.
> [0] https://lore.kernel.org/lkml/46137c67-25b4-6657-33b7-cffdc7afc0d7@igalia.com/
> 
> V2:
> - new patch, based on the discussion in [1].
> [1] https://lore.kernel.org/lkml/62a63fc2-346f-f375-043a-fa21385279df@igalia.com/
> 
> [...]

Hi Dinh, Tony, Boris - sorry for the ping.

Appreciate reviews on this one - Dinh already ACKed the patch but Boris
raised some points in the past version [0], so any opinions or
discussions are welcome!

Thanks,


Guilherme


[0]
https://lore.kernel.org/lkml/46137c67-25b4-6657-33b7-cffdc7afc0d7@igalia.com/