linux-kernel - Re: [-mm PATCH] register_memory/unregister

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Message-Id: <1202854031.25604.62.camel@dyn9047017100.beaverton.ibm.com>
Date:	Tue, 12 Feb 2008 14:07:11 -0800
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	Yasunori Goto <y-goto@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>, greg@...ah.com,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [-mm PATCH] register_memory/unregister_memory clean ups

On Tue, 2008-02-12 at 13:57 -0800, Dave Hansen wrote:
> On Tue, 2008-02-12 at 13:56 -0800, Badari Pulavarty wrote:
> > 
> > +static void __remove_section(struct zone *zone, unsigned long
> > section_nr)
> > +{
> > +       if (!valid_section_nr(section_nr))
> > +               return;
> > +
> > +       unregister_memory_section(__nr_to_section(section_nr));
> > +       sparse_remove_one_section(zone, section_nr);
> > +}
> 
> I do think passing in a mem_section* here is highly superior.  It makes
> it impossible to pass a pfn in and not get a warning.
> 

Only problem is, I need to hold pgdat_resize_lock() if pass *ms. 
If I don't hold the resize_lock, I have to re-evaluate. And also,
I need to pass section_nr for decoding the mem_map anyway :(

Thanks,
Badari

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