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Message-ID: <43BE1C62.9030101@cosmosbay.com>
Date: Fri, 06 Jan 2006 08:29:38 +0100
From: Eric Dumazet <dada1@cosmosbay.com>
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To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] reduce sizeof(percpu_data) and removes dependance against
 NR_CPUS
References: <1135251766.3557.13.camel@pmac.infradead.org> <20060105021929.498f45ef.akpm@osdl.org> <43BD2406.2040007@cosmosbay.com> <Pine.LNX.4.61.0601060816330.22809@yvahk01.tjqt.qr>
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Jan Engelhardt a écrit :
> 
> --- 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.
> 

Or even dont change percpu.h, or else some guys will assume percpu_data cost 
nothing...

Eric