linux-kernel - Re: [PATCH] memory hotplug: fix warnings

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Message-ID: <alpine.DEB.2.02.1304300952210.31619@chino.kir.corp.google.com>
Date:	Tue, 30 Apr 2013 09:54:18 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Vincent Stehlé <vincent.stehle@...oste.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory hotplug: fix warnings

On Tue, 30 Apr 2013, Andrew Morton wrote:

> > > diff --git a/include/linux/memory.h b/include/linux/memory.h
> > > index 73817af..85c31a8 100644
> > > --- a/include/linux/memory.h
> > > +++ b/include/linux/memory.h
> > > @@ -137,7 +137,7 @@ enum mem_add_context { BOOT, HOTPLUG };
> > >  #define register_hotmemory_notifier(nb)		register_memory_notifier(nb)
> > >  #define unregister_hotmemory_notifier(nb) 	unregister_memory_notifier(nb)
> > >  #else
> > > -#define hotplug_memory_notifier(fn, pri)	(0)
> > > +#define hotplug_memory_notifier(fn, pri)	({ 0; })
> > >  /* These aren't inline functions due to a GCC bug. */
> > >  #define register_hotmemory_notifier(nb)    ({ (void)(nb); 0; })
> > >  #define unregister_hotmemory_notifier(nb)  ({ (void)(nb); })
> > 
> > You can't use the standard do {} while (0)?
> 
> register_memory_notifier() (and hence hotplug_memory_notifier())
> returns an errno.  Which nobody bothers checking.
> 

The notifier itself is statically allocated so there's no memory 
allocations in this path, there's no chance it'll fail.  Should we just 
make register_memory_notifier() return void?
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