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

Guilherme G. Piccoli
2022-08-17T22:10:59Z

On 17/08/2022 19:00, Borislav Petkov wrote:
> On Wed, Aug 17, 2022 at 06:56:11PM -0300, Guilherme G. Piccoli wrote:
>> But do you agree that currently, in case of a kdump, that information
>> *is not collected*, with our without my patch?
>
> If for some reason that panic notifier does not get run before kdump,
> then that's a bug and that driver should not use a panic notifier to log
> hw errors in the first place.
>

Indeed, the notifiers don't run before kdump by default, in a conscious
decision of the kdump maintainers.

You might be right, in the sense that maybe the edac error handler
shouldn't run as a panic notifier. Let's see if Tony / Dinh can chime in
on that discussion - we could move it to run in the kexec event as well,
so it'd always run before a kdump, but maybe the risk it offers during
panic time is not worth.

Again - a matter of a trade-off, a good compromise must be agreed by all
parties (kdump maintainers are usually extremely afraid of taking risks
to not break kdump).

Cheers!