Re: [PATCH] rcu_barrier VS cpu_hotplug: Ensure callbacks in deadcpu are migrated to online cpu

[Ingo Molnar]

* Lai Jiangshan <laijs@xxxxxxxxxxxxxx> wrote:

> [RFC]
> I don't like this patch, but I thought for some days and I can't
> thought out a better one.

Interesting find. Found via code review or via testing? If via 
testing, what is the symptom of the bug when it hits - did you 
see CPU hotplug stress-tests hanging? Crashing too perhaps? How 
frequently did it occur?

It also appears we introduced this bug at around 2.6.26 (when 
the CPU hotplug code was rewritten) - or had it before that as 
well.

We are late in -rc's so i'm trying to scope whether it's a 
2.6.29 must-have or can wait for 2.6.30.

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/