linux-kernel - Re: [PATCH] rcu_barrier VS cpu_hotplug: Ensure callbacks in dead cpu are migrated to online cpu

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Message-ID: <20090308160005.GE19658@elte.hu>
Date:	Sun, 8 Mar 2009 17:00:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu_barrier VS cpu_hotplug: Ensure callbacks in dead
	cpu are migrated to online cpu

* Lai Jiangshan <laijs@...fujitsu.com> 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
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