linux-kernel - Re: [PATCH -tip 1/2] [PATCH -tip 1/2] sched: Reinstate group names in /proc/sched

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Message-ID: <20110112231602.GH17328@linux.vnet.ibm.com>
Date:	Wed, 12 Jan 2011 15:16:02 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	bharata@...ux.vnet.ibm.com, Yong Zhang <yong.zhang0@...il.com>,
	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH -tip 1/2] [PATCH -tip 1/2] sched: Reinstate group names
 in /proc/sched_debug.

On Wed, Jan 12, 2011 at 12:18:32PM +0100, Peter Zijlstra wrote:
> On Wed, 2011-01-12 at 13:19 +0530, Bharata B Rao wrote:
> > 
> > We could, but I guess its not a recommended practice anymore to depend on
> > spinlocks to protect rcu readside.
> 
> Not only is it not recommended, its a flat out bug for PREEMPT_RCU.

And lockdep-RCU will yell at you under PREEMPT_RCU, which will result
in Miles Lane yelling at me.  ;-)

							Thanx, Paul
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