linux-kernel - Re: [PATCH 1/5] mm/workingset: remove unused @mapping argument in workingset

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Date:   Mon, 25 Feb 2019 13:01:00 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH 1/5] mm/workingset: remove unused @mapping argument in
 workingset_eviction()

On 2/22/19 6:43 PM, Andrey Ryabinin wrote:
> workingset_eviction() doesn't use and never did use the @mapping argument.
> Remove it.
> 
> Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Rik van Riel <riel@...riel.com>
> Cc: Mel Gorman <mgorman@...hsingularity.net>
> ---
>  include/linux/swap.h | 2 +-
>  mm/vmscan.c          | 2 +-
>  mm/workingset.c      | 3 +--
>  3 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index 649529be91f2..fc50e21b3b88 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -307,7 +307,7 @@ struct vma_swap_readahead {
>  };
>  
>  /* linux/mm/workingset.c */
> -void *workingset_eviction(struct address_space *mapping, struct page *page);
> +void *workingset_eviction(struct page *page);
>  void workingset_refault(struct page *page, void *shadow);
>  void workingset_activation(struct page *page);
>  
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index ac4806f0f332..a9852ed7b97f 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -952,7 +952,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
>  		 */
>  		if (reclaimed && page_is_file_cache(page) &&
>  		    !mapping_exiting(mapping) && !dax_mapping(mapping))
> -			shadow = workingset_eviction(mapping, page);
> +			shadow = workingset_eviction(page);
>  		__delete_from_page_cache(page, shadow);
>  		xa_unlock_irqrestore(&mapping->i_pages, flags);
>  
> diff --git a/mm/workingset.c b/mm/workingset.c
> index dcb994f2acc2..0906137760c5 100644
> --- a/mm/workingset.c
> +++ b/mm/workingset.c
> @@ -215,13 +215,12 @@ static void unpack_shadow(void *shadow, int *memcgidp, pg_data_t **pgdat,
>  
>  /**
>   * workingset_eviction - note the eviction of a page from memory
> - * @mapping: address space the page was backing
>   * @page: the page being evicted
>   *
>   * Returns a shadow entry to be stored in @mapping->i_pages in place

The line above still references @mapping, I guess kerneldoc build will
complain?

>   * of the evicted @page so that a later refault can be detected.
>   */
> -void *workingset_eviction(struct address_space *mapping, struct page *page)
> +void *workingset_eviction(struct page *page)
>  {
>  	struct pglist_data *pgdat = page_pgdat(page);
>  	struct mem_cgroup *memcg = page_memcg(page);
>