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Date: Mon, 16 May 2016 16:17:51 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Rik van Riel <riel@redhat.com>,
        Vlastimil Babka <vbabka@suse.cz>, Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
        Rafael Aquini <aquini@redhat.com>,
        virtualization@lists.linux-foundation.org,
        Jonathan Corbet <corbet@lwn.net>,
        John Einar Reitan <john.reitan@foss.arm.com>,
        dri-devel@lists.freedesktop.org,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Gioh Kim <gi-oh.kim@profitbricks.com>
Subject: Re: [PATCH v5 02/12] mm: migrate: support non-lru movable page
 migration
Message-ID: <20160516071751.GA32079@swordfish>
References: <1462760433-32357-1-git-send-email-minchan@kernel.org>
 <1462760433-32357-3-git-send-email-minchan@kernel.org>
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On (05/09/16 11:20), Minchan Kim wrote:
[..]
> +++ b/include/linux/migrate.h
> @@ -32,11 +32,16 @@ extern char *migrate_reason_names[MR_TYPES];
>  
>  #ifdef CONFIG_MIGRATION
>  
> +extern int PageMovable(struct page *page);
> +extern void __SetPageMovable(struct page *page, struct address_space *mapping);
> +extern void __ClearPageMovable(struct page *page);
>  extern void putback_movable_pages(struct list_head *l);
>  extern int migrate_page(struct address_space *,
>  			struct page *, struct page *, enum migrate_mode);
>  extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
>  		unsigned long private, enum migrate_mode mode, int reason);
> +extern bool isolate_movable_page(struct page *page, isolate_mode_t mode);
> +extern void putback_movable_page(struct page *page);
>  
>  extern int migrate_prep(void);
>  extern int migrate_prep_local(void);

given that some of Movable users can be built as modules, shouldn't
at least some of those symbols be exported via EXPORT_SYMBOL?

	-ss