linux-kernel - Re: [PATCH] mm: remove return value of putback_lru

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Message-Id: <20100316085405.f2720f56.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 16 Mar 2010 08:54:05 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: remove return value of putback_lru_pages

On Mon, 15 Mar 2010 22:16:34 +0900
Minchan Kim <minchan.kim@...il.com> wrote:

> 
> Now putback_lru_page never can fail.
> So it doesn't matter count of "the number of pages put back".
> 
> In addition, users of this functions don't use return value.
> 
> Let's remove unnecessary code.
> 
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

> ---
>  include/linux/migrate.h |    4 ++--
>  mm/migrate.c            |    7 +------
>  2 files changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index 7f085c9..7a07b17 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -9,7 +9,7 @@ typedef struct page *new_page_t(struct page *, unsigned long private, int **);
>  #ifdef CONFIG_MIGRATION
>  #define PAGE_MIGRATION 1
>  
> -extern int putback_lru_pages(struct list_head *l);
> +extern void putback_lru_pages(struct list_head *l);
>  extern int migrate_page(struct address_space *,
>  			struct page *, struct page *);
>  extern int migrate_pages(struct list_head *l, new_page_t x,
> @@ -25,7 +25,7 @@ extern int migrate_vmas(struct mm_struct *mm,
>  #else
>  #define PAGE_MIGRATION 0
>  
> -static inline int putback_lru_pages(struct list_head *l) { return 0; }
> +static inline void putback_lru_pages(struct list_head *l) {}
>  static inline int migrate_pages(struct list_head *l, new_page_t x,
>  		unsigned long private, int offlining) { return -ENOSYS; }
>  
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 88000b8..6903abf 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -57,23 +57,18 @@ int migrate_prep(void)
>  /*
>   * Add isolated pages on the list back to the LRU under page lock
>   * to avoid leaking evictable pages back onto unevictable list.
> - *
> - * returns the number of pages put back.
>   */
> -int putback_lru_pages(struct list_head *l)
> +void putback_lru_pages(struct list_head *l)
>  {
>  	struct page *page;
>  	struct page *page2;
> -	int count = 0;
>  
>  	list_for_each_entry_safe(page, page2, l, lru) {
>  		list_del(&page->lru);
>  		dec_zone_page_state(page, NR_ISOLATED_ANON +
>  				page_is_file_cache(page));
>  		putback_lru_page(page);
> -		count++;
>  	}
> -	return count;
>  }
>  
>  /*
> -- 
> 1.6.5
> 
> 
> 
> -- 
> Kind regards,
> Minchan Kim
> 
> 
> --
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> 

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