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Message-ID: <e56aea36-f454-a75f-5f83-4150b87c9c15@suse.cz>
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);
>
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