linux-kernel - Re: [PATCH] mm/memory_hotplug: remove an unused variable in move_pfn_range_to

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Date:   Tue, 27 Jun 2017 07:25:35 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc:     Wei Yang <richard.weiyang@...il.com>, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memory_hotplug: remove an unused variable in
 move_pfn_range_to_zone()

On Tue 27-06-17 10:26:38, Anshuman Khandual wrote:
> On 06/27/2017 04:49 AM, Wei Yang wrote:
> > There is an unused variable in move_pfn_range_to_zone().
> > 
> > This patch just removes it.
> > 
> > Signed-off-by: Wei Yang <richard.weiyang@...il.com>
> > ---
> >  mm/memory_hotplug.c | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> > index 514014dde16b..16167c92bbf1 100644
> > --- a/mm/memory_hotplug.c
> > +++ b/mm/memory_hotplug.c
> > @@ -899,7 +899,6 @@ void __ref move_pfn_range_to_zone(struct zone *zone,
> >  	struct pglist_data *pgdat = zone->zone_pgdat;
> >  	int nid = pgdat->node_id;
> >  	unsigned long flags;
> > -	unsigned long i;
> >  
> >  	if (zone_is_empty(zone))
> >  		init_currently_empty_zone(zone, start_pfn, nr_pages);
> 
> We have this down in the function. IIRC I had checked out tag
> mmotm-2017-06-16-13-59 where I am looking out for this function.

It's a follow up for
mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix-2.patch
in mmotm-2017-06-23-15-03

> 
> for (i = 0; i < nr_pages; i++) {
> 	unsigned long pfn = start_pfn + i;
> 	set_page_links(pfn_to_page(pfn), zone_idx(zone), nid, pfn);
> }
> 
> 

-- 
Michal Hocko
SUSE Labs