linux-kernel - Re: invalidate caches before going into suspend

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Date:	Wed, 13 Aug 2008 21:39:28 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mark Langsdorf <mark.langsdorf@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: invalidate caches before going into suspend

Mark Langsdorf <mark.langsdorf@....com> writes:
> @@ -93,11 +93,11 @@ static inline void play_dead(void)
>  static inline void play_dead(void)
>  {
>  	idle_task_exit();
> -	wbinvd();
>  	mb();
>  	/* Ack it */
>  	__get_cpu_var(cpu_state) = CPU_DEAD;
>  
> +	wbinvd();

You should put the mb() (or just a barrier()) directly above the wbinvd(), 
otherwise the compiler is free to reorder this behind your back again
and move the store down after the wbinvd.

-Andi
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