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

[Ingo Molnar <mingo@elte.hu>]

* Heiko Carstens <heiko.carstens@de.ibm.com> wrote:

> On Sat, 21 Mar 2009 15:39:11 +0100
> Ingo Molnar <mingo@elte.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@de.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?

There's still too many warnings in general on other platforms - but 
as long as it's per arch we could in fact propagate the warnings to 
build failures.

	Ingo