linux-kernel - Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL

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Message-ID: <20150730153129.GK25159@twins.programming.kicks-ass.net>
Date:	Thu, 30 Jul 2015 17:31:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 02/19] rcu: Remove CONFIG_RCU_CPU_STALL_INFO

On Thu, Jul 30, 2015 at 08:13:41AM -0700, Paul E. McKenney wrote:
> On Thu, Jul 30, 2015 at 02:49:55PM +0200, Peter Zijlstra wrote:
> > On Fri, Jul 17, 2015 at 04:29:07PM -0700, Paul E. McKenney wrote:
> > > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > > 
> > > The CONFIG_RCU_CPU_STALL_INFO has been default-y for a couple of
> > > releases with no complaints, so it is time to eliminate this Kconfig
> > > option entirely, so that the long-form RCU CPU stall warnings cannot
> > > be disabled.  This commit does just that.
> > 
> > I would think the tiny people (/me looks @ Josh) would complain about
> > this..
> 
> They might, but if they do, I will point out that CONFIG_RCU_CPU_STALL_INFO
> only has effect for Tree RCU.  And also that RCU CPU stall warnings are
> compiled out unless CONFIG_RCU_TRACE=y, which I suspect they are disabling.

Ah, fair enough.
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