linux-kernel - Re: [PATCH v7] mm/page_alloc.c: memory_hotplug: free pages as higher order

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Message-ID: <20190108181352.GI31793@dhcp22.suse.cz>
Date:   Tue, 8 Jan 2019 19:13:52 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     Arun KS <arunks@...eaurora.org>, arunks.linux@...il.com,
        akpm@...ux-foundation.org, vbabka@...e.cz, osalvador@...e.de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        getarunks@...il.com
Subject: Re: [PATCH v7] mm/page_alloc.c: memory_hotplug: free pages as higher
 order

On Tue 08-01-19 09:56:09, Alexander Duyck wrote:
> On Fri, 2019-01-04 at 10:31 +0530, Arun KS wrote:
[...]
> >  static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
> >  			void *arg)
> >  {
> > -	unsigned long i;
> >  	unsigned long onlined_pages = *(unsigned long *)arg;
> > -	struct page *page;
> >  
> >  	if (PageReserved(pfn_to_page(start_pfn)))
> > -		for (i = 0; i < nr_pages; i++) {
> > -			page = pfn_to_page(start_pfn + i);
> > -			(*online_page_callback)(page);
> > -			onlined_pages++;
> > -		}
> > +		onlined_pages = online_pages_blocks(start_pfn, nr_pages);
> 
> Shouldn't this be a "+=" instead of an "="? It seems like you are going
> to lose your count otherwise.

You are right of course. I should have noticed during the review.
Thanks!
-- 
Michal Hocko
SUSE Labs