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

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Date:	Mon, 18 Dec 2006 22:15:34 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	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 Mon, Dec 18, 2006 at 01:13:57PM -0800, Dave Hansen wrote:
> 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.  

Yes, I stronly concur that passing an explicit flag is much much better
than any hack involving global state.
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