linux-kernel - Re: [PATCH] Fix sparsemem on Cell

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Message-Id: <1166476437.8648.7.camel@localhost.localdomain>
Date:	Mon, 18 Dec 2006 13:13:57 -0800
From:	Dave Hansen <haveblue@...ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...l.org>, apw@...dowen.org,
	cbe-oss-dev@...abs.org, linuxppc-dev@...abs.org,
	linux-mm@...ck.org, mkravetz@...ibm.com, hch@...radead.org,
	jk@...abs.org, linux-kernel@...r.kernel.org, paulus@...ba.org,
	benh@...nel.crashing.org, gone@...ibm.com, kmannth@...ibm.com
Subject: Re: [PATCH] Fix sparsemem on Cell

On Sat, 2006-12-16 at 17:03 +0900, KAMEZAWA Hiroyuki wrote:
>  /* add this memory to iomem resource */
>  static struct resource *register_memory_resource(u64 start, u64 size)
>  {
> @@ -273,10 +284,13 @@
>  		if (ret)
>  			goto error;
>  	}
> +	atomic_inc(&memory_hotadd_count);
>  
>  	/* call arch's memory hotadd */
>  	ret = arch_add_memory(nid, start, size);
>  
> +	atomic_dec(&memory_hotadd_count);

I'd be willing to be that this will work just fine.  But, I think we can
do it without any static state at all, if we just pass a runtime-or-not
flag down into the arch_add_memory() call chain.

I'll code that up so we can compare to yours.  

-- Dave

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