linux-kernel - Re: [PATCH] trace/ring_buffer: fix section mismatch warning

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Message-ID: <20090321203326.GA11182@uranus.ravnborg.org>
Date:	Sat, 21 Mar 2009 21:33:26 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace/ring_buffer: fix section mismatch warning

On Sat, Mar 21, 2009 at 04:01:02PM +0100, Heiko Carstens wrote:
> On Sat, 21 Mar 2009 15:39:11 +0100
> Ingo Molnar <mingo@...e.hu> wrote:
> > > Section mismatch in reference from the function 
> > > ring_buffer_alloc() to the function .cpuinit.text:rb_cpu_notify() 
> > > The function ring_buffer_alloc() references the function __cpuinit 
> > > rb_cpu_notify(). This is often because ring_buffer_alloc lacks a 
> > > __cpuinit annotation or the annotation of rb_cpu_notify is wrong.
> > > 
> > > This is a false positive since rb_cpu_notify gets only referenced 
> > > if CONFIG_HOTPLUG_CPU=y. To get rid of the warning annotate 
> > > ring_buffer_alloc with __ref.
> > > 
> > > Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
> > > ---
> > >  kernel/trace/ring_buffer.c |    2 +-
> > 
> > Frederic has beaten you to it narrowly:
> > 
> > 09c9e84: tracing/ring-buffer: don't annotate rb_cpu_notify with __cpuinit
> 
> Btw. that was the only section mismatch warning I got on linux-next
> with an allyesconfig on s390. We probably could enable the verbose
> section mismatch warnings at compile time?
> 
> Sam?

When I get a bit more time (and a properly working setup again)
I will enable the verbose version.
But until I can dedicate enough time to support it I am not the
one to make it more verbose.

That may be in the timeframe of 2.6.30 but I'm not sure.

	Sam
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