On Mon, Feb 20, 2017 at 02:10:37PM +0800, Xunlei Pang wrote:
> @@ -1128,8 +1129,9 @@ void do_machine_check(struct pt_regs *regs, long
> error_code)
> */
> int lmce = 1;
>
> - /* If this CPU is offline, just bail out. */
> - if (cpu_is_offline(smp_processor_id())) {
> + /* If nmi shootdown happened or this CPU is offline, just bail out. */
> + if (cpus_shotdown() ||
I don't like "cpus_shotdown" - it doesn't hint at all that this is
special-handling crash/kdump.
And more importantly, I want it to be obvious that we do let the
crashing CPU into the MCE handler.
Why?
If we didn't, you will not handle *any* MCE, even a fatal one, during
dumping memory so if that dump is corrupted from the MCE, you won't
know. And I don't want to be the one staring at the corrupted dump and
wondering why I'm seeing what I'm seeing.
IOW, if we get a fatal MCE during dumping then we should go and die.
This is much better than silently corrupting the dump and not even
saying anything about it.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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