linux-kernel - Re: [PATCH][mmtom] remove file arguement of swap

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Date:	Fri, 5 Jun 2009 19:05:54 +0100 (BST)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Minchan Kim <minchan.kim@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH][mmtom] remove file arguement of swap_readpage

On Fri, 5 Jun 2009, Minchan Kim wrote:

> The file argument resulted from address_space's readpage
> long time ago.
> 
> Now we don't use it any more. Let's remove unnecessary
> argement.
> 
> This patch cleans up swap_readpage.
> It doesn't affect behavior of function.
> 
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> Cc: Hugh Dickins <hugh.dickins@...cali.co.uk>
> Cc: Rik van Riel <riel@...hat.com>

Okay, yes: but don't be surprised if someone sends in a patch
to put it back, as in the other readpage()s.

Acked-by: Hugh Dickins <hugh.dickins@...cali.co.uk>

> ---
>  include/linux/swap.h |    2 +-
>  mm/page_io.c         |    2 +-
>  mm/swap_state.c      |    2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index 2dedc2d..c88b366 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -256,7 +256,7 @@ extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
>  
>  #ifdef CONFIG_SWAP
>  /* linux/mm/page_io.c */
> -extern int swap_readpage(struct file *, struct page *);
> +extern int swap_readpage(struct page *);
>  extern int swap_writepage(struct page *page, struct writeback_control *wbc);
>  extern void end_swap_bio_read(struct bio *bio, int err);
>  
> diff --git a/mm/page_io.c b/mm/page_io.c
> index 3023c47..c6f3e50 100644
> --- a/mm/page_io.c
> +++ b/mm/page_io.c
> @@ -120,7 +120,7 @@ out:
>  	return ret;
>  }
>  
> -int swap_readpage(struct file *file, struct page *page)
> +int swap_readpage(struct page *page)
>  {
>  	struct bio *bio;
>  	int ret = 0;
> diff --git a/mm/swap_state.c b/mm/swap_state.c
> index b62e7f5..42cd38e 100644
> --- a/mm/swap_state.c
> +++ b/mm/swap_state.c
> @@ -313,7 +313,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
>  			 * Initiate read into locked page and return.
>  			 */
>  			lru_cache_add_anon(new_page);
> -			swap_readpage(NULL, new_page);
> +			swap_readpage(new_page);
>  			return new_page;
>  		}
>  		ClearPageSwapBacked(new_page);
> -- 
> 1.5.6.5
> 
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