linux-kernel - Re: [PATCH] mm: get_nid_for

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Message-Id: <20090126223350.610b0283.akpm@linux-foundation.org>
Date:	Mon, 26 Jan 2009 22:33:50 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Gary Hade <garyhade@...ibm.com>
Cc:	Roel Kluin <roel.kluin@...il.com>, Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH] mm: get_nid_for_pfn() returns int

On Mon, 19 Jan 2009 09:59:19 -0800 Gary Hade <garyhade@...ibm.com> wrote:

> On Sun, Jan 18, 2009 at 11:36:28PM +0100, Roel Kluin wrote:
> > get_nid_for_pfn() returns int
> > 
> > Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> > ---
> > vi drivers/base/node.c +256
> > static int get_nid_for_pfn(unsigned long pfn)
> > 
> > diff --git a/drivers/base/node.c b/drivers/base/node.c
> > index 43fa90b..f8f578a 100644
> > --- a/drivers/base/node.c
> > +++ b/drivers/base/node.c
> > @@ -303,7 +303,7 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
> >  	sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
> >  	sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
> >  	for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
> > -		unsigned int nid;
> > +		int nid;
> > 
> >  		nid = get_nid_for_pfn(pfn);
> >  		if (nid < 0)
> 
> My mistake.  Good catch.
> 

Presumably the (nid < 0) case has never happened.

Should we retain the test?

Is silently skipping the node in that case desirable behaviour?
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