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Date: Thu, 5 Jan 2006 23:27:36 -0800
From: Andrew Morton <akpm@osdl.org>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: dada1@cosmosbay.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] reduce sizeof(percpu_data) and removes dependance
 against NR_CPUS
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Jan Engelhardt <jengelh@linux01.gwdg.de> wrote:
>
> 
> 
> --- linux-2.6.15/include/linux/percpu.h	2006-01-03 04:21:10.000000000 +0100
> +++ linux-2.6.15-edum/include/linux/percpu.h	2006-01-05 14:45:48.000000000 +0100
> @@ -18,8 +18,7 @@
>  #ifdef CONFIG_SMP
>  
>  struct percpu_data {
> -	void *ptrs[NR_CPUS];
> -	void *blkp;
> +	void *ptrs[1]; /* real size depends on highest_possible_processor_id() */
>  };
>  
>  /* 
> 
> 
> I think we can use *ptrs[0] here.
> 

We can.  In fact with the gcc-2.95 abandonment I think we can use ptrs[].

But it doesn't matter.