linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <547defc3.28568c0a.73eb.1a1e@mx.google.com>
Date:	Tue, 2 Dec 2014 14:58:38 -0200
From:	Dâniel Fraga <fragabr@...il.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	<paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Tue, 2 Dec 2014 16:40:37 +0800
Lai Jiangshan <laijs@...fujitsu.com> wrote:

> It is needed at lest for testing.
> 
> CONFIG_TREE_PREEMPT_RCU=y with CONFIG_PREEMPT=n is needed for testing too.
> 
> Please enable them (or enable them under CONFIG_RCU_TRACE=y)

	Lai, sorry but I didn't understand. Do you mean both of them
enabled? Because how can CONFIG_TREE_PREEMPT_RCU be enabled without
CONFIG_PREEMPT ?

	If you mean both enabled, I already reported a call trace with
both enabled:

https://bugzilla.kernel.org/show_bug.cgi?id=85941

	Please see my previous answer to Linus and Paul too.

	Regarding CONFIG_RCU_TRACE, do you mean
"CONFIG_TREE_RCU_TRACE"? I couldn't find CONFIG_RCU_TRACE.

	Thanks.

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