linux-kernel - Re: [PATCH] mm: migrate: remove unused mode argument

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Date:   Thu, 9 May 2019 09:22:12 -0700
From:   Zi Yan <ziy@...dia.com>
To:     Keith Busch <keith.busch@...el.com>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH] mm: migrate: remove unused mode argument

On 8 May 2019, at 14:03, Keith Busch wrote:

> migrate_page_move_mapping() doesn't use the mode argument. Remove it
> and update callers accordingly.
>
> Signed-off-by: Keith Busch <keith.busch@...el.com>
> ---
>  fs/aio.c                | 2 +-
>  fs/f2fs/data.c          | 2 +-
>  fs/iomap.c              | 2 +-
>  fs/ubifs/file.c         | 2 +-
>  include/linux/migrate.h | 3 +--
>  mm/migrate.c            | 7 +++----
>  6 files changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/fs/aio.c b/fs/aio.c
> index 3490d1fa0e16..1a1568861b4e 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -425,7 +425,7 @@ static int aio_migratepage(struct address_space *mapping, struct page *new,
>  	BUG_ON(PageWriteback(old));
>  	get_page(new);
>
> -	rc = migrate_page_move_mapping(mapping, new, old, mode, 1);
> +	rc = migrate_page_move_mapping(mapping, new, old, 1);
>  	if (rc != MIGRATEPAGE_SUCCESS) {
>  		put_page(new);
>  		goto out_unlock;
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 9727944139f2..0eb7a8cd3138 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2801,7 +2801,7 @@ int f2fs_migrate_page(struct address_space *mapping,
>  	/* one extra reference was held for atomic_write page */
>  	extra_count = atomic_written ? 1 : 0;
>  	rc = migrate_page_move_mapping(mapping, newpage,
> -				page, mode, extra_count);
> +				page, extra_count);
>  	if (rc != MIGRATEPAGE_SUCCESS) {
>  		if (atomic_written)
>  			mutex_unlock(&fi->inmem_lock);
> diff --git a/fs/iomap.c b/fs/iomap.c
> index abdd18e404f8..f26f4846a00b 100644
> --- a/fs/iomap.c
> +++ b/fs/iomap.c
> @@ -571,7 +571,7 @@ iomap_migrate_page(struct address_space *mapping, struct page *newpage,
>  {
>  	int ret;
>
> -	ret = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
> +	ret = migrate_page_move_mapping(mapping, newpage, page, 0);
>  	if (ret != MIGRATEPAGE_SUCCESS)
>  		return ret;
>
> diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
> index 5d2ffb1a45fc..d906ebc24049 100644
> --- a/fs/ubifs/file.c
> +++ b/fs/ubifs/file.c
> @@ -1481,7 +1481,7 @@ static int ubifs_migrate_page(struct address_space *mapping,
>  {
>  	int rc;
>
> -	rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
> +	rc = migrate_page_move_mapping(mapping, newpage, page, 0);
>  	if (rc != MIGRATEPAGE_SUCCESS)
>  		return rc;
>
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index e13d9bf2f9a5..7f04754c7f2b 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -77,8 +77,7 @@ extern void migrate_page_copy(struct page *newpage, struct page *page);
>  extern int migrate_huge_page_move_mapping(struct address_space *mapping,
>  				  struct page *newpage, struct page *page);
>  extern int migrate_page_move_mapping(struct address_space *mapping,
> -		struct page *newpage, struct page *page, enum migrate_mode mode,
> -		int extra_count);
> +		struct page *newpage, struct page *page, int extra_count);
>  #else
>
>  static inline void putback_movable_pages(struct list_head *l) {}
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 663a5449367a..85f46bfcf141 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -397,8 +397,7 @@ static int expected_page_refs(struct address_space *mapping, struct page *page)
>   * 3 for pages with a mapping and PagePrivate/PagePrivate2 set.
>   */
>  int migrate_page_move_mapping(struct address_space *mapping,
> -		struct page *newpage, struct page *page, enum migrate_mode mode,
> -		int extra_count)
> +		struct page *newpage, struct page *page, int extra_count)
>  {
>  	XA_STATE(xas, &mapping->i_pages, page_index(page));
>  	struct zone *oldzone, *newzone;
> @@ -684,7 +683,7 @@ int migrate_page(struct address_space *mapping,
>
>  	BUG_ON(PageWriteback(page));	/* Writeback must be complete */
>
> -	rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
> +	rc = migrate_page_move_mapping(mapping, newpage, page, 0);
>
>  	if (rc != MIGRATEPAGE_SUCCESS)
>  		return rc;
> @@ -783,7 +782,7 @@ static int __buffer_migrate_page(struct address_space *mapping,
>  		}
>  	}
>
> -	rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
> +	rc = migrate_page_move_mapping(mapping, newpage, page, 0);
>  	if (rc != MIGRATEPAGE_SUCCESS)
>  		goto unlock_buffers;
>
> -- 
> 2.14.4

LGTM. Thanks. Reviewed-by: Zi Yan <ziy@...dia.com>

--
Best Regards,
Yan Zi

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