Re: [PATCH v8] x86: mce: kexec: switch MCE handler for kexec/kdump

Borislav Petkov
2015-04-09T09:55:25Z

On Thu, Apr 09, 2015 at 08:59:44AM +0000, Naoya Horiguchi wrote:
> I replied about testing. That might be tricky a little, but I hope it helps.

Yeah, whatever we do, we need this properly tested before upstreaming.
That's a given.

> Even if we raise tolerant level in running kdump, that doesn't prevent
> idling CPUs from running MCE handlers when MCE arrives, which makes memory
> accesses (losing information from kdump's viewpoint) and spits
> "MCE synchronization timeout" messages (unclear and confusing for users.)

Why? Those CPUs are offlined and num_online_cpus() in mce_start() should
account for that, no?

And if those are offlined, they're very very unlikely to trigger an MCE
as they're idle and not executing code.

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
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