On Tue, Nov 22, 2022 at 10:33:12AM -0300, Guilherme G. Piccoli wrote:

Leaving in the whole thing for newly added people.

On 18/09/2022 11:10, Guilherme G. Piccoli wrote:

quoted

On 19/08/2022 19:17, Guilherme G. Piccoli wrote:

quoted

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@alien8.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Tony Luck <tony.luck@intel.com>
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.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/ (local)

V2:
- new patch, based on the discussion in [1].
[1] https://lore.kernel.org/lkml/62a63fc2-346f-f375-043a-fa21385279df@igalia.com/ (local)

[...]

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!

Hi folks, monthly ping heheh
Apologies for the re-pings, please let me know if there is anything
required to move on this patch.

Looking at this again, I really don't like the sprinkling of

	if (kexec_crash_loaded())

in unrelated code. And I still think that the real fix here is to kill
this

	edac->panic_notifier

thing. And replace it with simply logging the error from the double bit
error interrupt handle. That DBERR IRQ thing altr_edac_a10_irq_handler().
Because this is what this panic notifier does - dump double-bit errors.

Now, if Dinh doesn't move, I guess we can ask Tony and/or Rabara (he has
sent a patch for this driver recently and Altera belongs to Intel now)
to find someone who can test such a change and we (you could give it a
try first :)) can do that change.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette