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

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Message-Id: <20130430092919.a9ab7108.akpm@linux-foundation.org>
Date:	Tue, 30 Apr 2013 09:29:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Vincent Stehlé <vincent.stehle@...oste.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory hotplug: fix warnings

On Tue, 30 Apr 2013 09:17:11 -0700 (PDT) David Rientjes <rientjes@...gle.com> wrote:

> On Tue, 30 Apr 2013, Vincent Stehl__ 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.
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