linux-kernel - Re: [PATCH -tip 0/2] Temporary RCU fixes for notrace and hotplug CPU

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Message-ID: <20090825184157.GK6616@linux.vnet.ibm.com>
Date:	Tue, 25 Aug 2009 11:41:57 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josht@...ux.vnet.ibm.com,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH -tip 0/2] Temporary RCU fixes for notrace and hotplug CPU

On Tue, Aug 25, 2009 at 08:19:07PM +0200, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > On Tue, Aug 25, 2009 at 08:55:01AM +0200, Ingo Molnar wrote:
> > > 
> > > FYI, -tip testing found a new build warning on SH caused by the RCU 
> > > tree (i suspect this warning triggers on other architectures as 
> > > well):
> > > 
> > > /home/mingo/tip/kernel/rcutree.c:88: warning: '__rcu_offline_cpu' 
> > > declared 'static' but never defined
> > 
> > <red face>
> > 
> > > it's harmless, but since we are generally trying to fix all warnings 
> > > and gravitate towards more and more -Werror subsystems, it would be 
> > > nice to fix this.
> > 
> > Indeed, and I have updated my build-output-check script to alert 
> > me to warning messages from my multiple-configuration test runs.  
> > Please see below for patch.
> 
> btw., you can unset CONFIG_ALLOW_WARNINGS in -tip kernels to turn 
> build warnings into build failures - and those are harder to miss.

Thank you for the tip!!!

							Thanx, Paul
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