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

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Date:	Tue, 25 Aug 2009 20:19:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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


* 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.

	Ingo
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