linux-kernel - Re: [PATCH 1/2] mm, page_isolation: remove bogus tests for isolated pages

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Message-ID: <alpine.DEB.2.10.1507221442070.21468@chino.kir.corp.google.com>
Date:	Wed, 22 Jul 2015 14:42:15 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vlastimil Babka <vbabka@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"minkyung88.kim" <minkyung88.kim@....com>, kmk3210@...il.com,
	Seungho Park <seungho1.park@....com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Minchan Kim <minchan@...nel.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH 1/2] mm, page_isolation: remove bogus tests for isolated
 pages

On Wed, 22 Jul 2015, Vlastimil Babka wrote:

> From: Vlastimil Babka <vbabka@...e.cz>
> Date: Wed, 22 Jul 2015 14:16:52 +0200
> Subject: [PATCH 2/3] fixup! mm, page_isolation: remove bogus tests for
>  isolated pages
> 
> ---
>  mm/page_alloc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 41dc650..c61fef8 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -789,7 +789,11 @@ static void free_pcppages_bulk(struct zone *zone, int count,
>  			page = list_entry(list->prev, struct page, lru);
>  			/* must delete as __free_one_page list manipulates */
>  			list_del(&page->lru);
> +
>  			mt = get_freepage_migratetype(page);
> +			/* MIGRATE_ISOLATE page should not go to pcplists */
> +			VM_BUG_ON_PAGE(is_migrate_isolate(mt), page);
> +			/* Pageblock could have been isolated meanwhile */
>  			if (unlikely(has_isolate_pageblock(zone)))
>  				mt = get_pageblock_migratetype(page);
>  

Looks good, thanks!
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