linux-kernel - Re: [PATCH] mm: move function ‘is_pageblock_removable

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Date:   Wed, 9 May 2018 09:43:57 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: move function ‘is_pageblock_removable_nolock’
 inside blockers

On Sat 05-05-18 22:11:06, Mathieu Malaterre wrote:
> Function ‘is_pageblock_removable_nolock’ is not used unless
> CONFIG_MEMORY_HOTREMOVE is activated. Move it in between #ifdef sentinel to
> match prototype in <linux/memory_hotplug.h>. Silence gcc warning (W=1):
> 
>   mm/page_alloc.c:7704:6: warning: no previous prototype for ‘is_pageblock_removable_nolock’ [-Wmissing-prototypes]

Could you move is_pageblock_removable_nolock to mm/memory_hotplug.c
and make it static instead? There is only one caller
is_mem_section_removable so there shouldn't be any real reason to have
it extern and add more ifdefs.
 
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>  mm/page_alloc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 905db9d7962f..94ca579938e5 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7701,6 +7701,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
>  	return false;
>  }
>  
> +#ifdef CONFIG_MEMORY_HOTREMOVE
>  bool is_pageblock_removable_nolock(struct page *page)
>  {
>  	struct zone *zone;
> @@ -7723,6 +7724,7 @@ bool is_pageblock_removable_nolock(struct page *page)
>  
>  	return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE, true);
>  }
> +#endif
>  
>  #if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA)
>  
> -- 
> 2.11.0
> 

-- 
Michal Hocko
SUSE Labs