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

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Message-ID: <alpine.DEB.2.02.1304300916500.10368@chino.kir.corp.google.com>
Date:	Tue, 30 Apr 2013 09:17:11 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vincent Stehlé <vincent.stehle@...oste.net>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory hotplug: fix warnings

On Tue, 30 Apr 2013, Vincent Stehlé 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)?