linux-kernel - Re: [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs warnings

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Date:	Tue, 30 Jun 2015 09:57:51 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, laijs@...fujitsu.com,
	dipankar@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	pranith kumar <bobby.prani@...il.com>
Subject: Re: [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs
 warnings

On Mon, Jun 29, 2015 at 10:58:51PM +0200, Geert Uytterhoeven wrote:
> Hi Paul,
> 
> On Mon, Jun 29, 2015 at 10:55 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > On Mon, Jun 29, 2015 at 11:39:13AM +0200, Geert Uytterhoeven wrote:
> >> On Wed, May 13, 2015 at 12:30 AM, Paul E. McKenney
> >> <paulmck@...ux.vnet.ibm.com> wrote:
> >> > --- a/lib/Kconfig.debug
> >> > +++ b/lib/Kconfig.debug
> >> > @@ -1373,6 +1373,17 @@ config RCU_TRACE
> >> >           Say Y here if you want to enable RCU tracing
> >> >           Say N if you are unsure.
> >> >
> >> > +config RCU_EQS_DEBUG
> >> > +       bool "Use this when adding any sort of NO_HZ support to your arch"
> >>
> >> This sounds a bit fuzzy. Can you please provide a better one-line description?
> >> Thanks!
> >
> > So the point of this Kconfig option is to provide WARN_ON()s that catch
> > bug such as telling RCU that a given CPU entered idle, but failing to
> > tell RCU when that CPU later leaves idle.  So how about this?
> >
> > +       bool "Provide debugging asserts for adding NO_HZ support to an arch"
> 
> Much better, thanks!

Queued the following for v4.3, thank you!

								Thanx, Paul

------------------------------------------------------------------------

commit bb651123a8ed43543f3ec8ac84e6152a866e2639
Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Date:   Tue Jun 30 09:56:31 2015 -0700

    rcu: Clarify CONFIG_RCU_EQS_DEBUG help text
    
    Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
    Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 6be521990d61..80efaade5e59 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1360,7 +1360,7 @@ config RCU_TRACE
 	  Say N if you are unsure.
 
 config RCU_EQS_DEBUG
-	bool "Use this when adding any sort of NO_HZ support to your arch"
+	bool "Provide debugging asserts for adding NO_HZ support to an arch"
 	depends on DEBUG_KERNEL
 	help
 	  This option provides consistency checks in RCU's handling of

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