linux-kernel - Re: [PATCH] mm/page_isolate: change the prototype of undo_isolate_page

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Date:   Tue, 2 Jul 2019 16:02:32 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Pingfan Liu <kernelfans@...il.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>, Qian Cai <cai@....pw>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/page_isolate: change the prototype of
 undo_isolate_page_range()

On Tue 02-07-19 21:53:24, Pingfan Liu wrote:
> undo_isolate_page_range() never fails, so no need to return value.
> 
> Signed-off-by: Pingfan Liu <kernelfans@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Qian Cai <cai@....pw>
> Cc: Anshuman Khandual <anshuman.khandual@....com>
> Cc: linux-kernel@...r.kernel.org

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  include/linux/page-isolation.h | 2 +-
>  mm/page_isolation.c            | 3 +--
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
> index 280ae96..1099c2f 100644
> --- a/include/linux/page-isolation.h
> +++ b/include/linux/page-isolation.h
> @@ -50,7 +50,7 @@ start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
>   * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
>   * target range is [start_pfn, end_pfn)
>   */
> -int
> +void
>  undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
>  			unsigned migratetype);
>  
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index e3638a5..89c19c0 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -230,7 +230,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
>  /*
>   * Make isolated pages available again.
>   */
> -int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
> +void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
>  			    unsigned migratetype)
>  {
>  	unsigned long pfn;
> @@ -247,7 +247,6 @@ int undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
>  			continue;
>  		unset_migratetype_isolate(page, migratetype);
>  	}
> -	return 0;
>  }
>  /*
>   * Test all pages in the range is free(means isolated) or not.
> -- 
> 2.7.5

-- 
Michal Hocko
SUSE Labs