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Date:   Wed, 9 May 2018 09:43:57 +0200
From:   Michal Hocko <mhocko@kernel.org>
To:     Mathieu Malaterre <malat@debian.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>,
        Pavel Tatashin <pasha.tatashin@oracle.com>,
        Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: move =?utf-8?Q?function_?=
 =?utf-8?Q?=E2=80=98is=5Fpageblock=5Fremovable=5Fnolock?= =?utf-8?B?4oCZ?=
 inside blockers
Message-ID: <20180509074357.GB32366@dhcp22.suse.cz>
References: <20180505201107.21070-1-malat@debian.org>
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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@debian.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