Re: [PATCH v1 04/11] mm: migrate: remove migrate_folio_extra()

On 2024/3/21 11:27, Kefeng Wang wrote:
> The migrate_folio_extra() only called in migrate.c now, convert it
> a static function and take a new src_private argument which could
> be shared by migrate_folio() and filemap_migrate_folio() to simplify
> code a bit.
> 
> Signed-off-by: Kefeng Wang <[email protected]>
> ---
>  include/linux/migrate.h |  2 --
>  mm/migrate.c            | 33 +++++++++++----------------------
>  2 files changed, 11 insertions(+), 24 deletions(-)
> 
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index 2ce13e8a309b..517f70b70620 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -63,8 +63,6 @@ extern const char *migrate_reason_names[MR_TYPES];
>  #ifdef CONFIG_MIGRATION
>  
>  void putback_movable_pages(struct list_head *l);
> -int migrate_folio_extra(struct address_space *mapping, struct folio *dst,
> -		struct folio *src, enum migrate_mode mode, int extra_count);
>  int migrate_folio(struct address_space *mapping, struct folio *dst,
>  		struct folio *src, enum migrate_mode mode);
>  int migrate_pages(struct list_head *l, new_folio_t new, free_folio_t free,
> diff --git a/mm/migrate.c b/mm/migrate.c
> index cb4cbaa42a35..c006b0b44013 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -658,18 +658,19 @@ EXPORT_SYMBOL(folio_migrate_copy);
>   *                    Migration functions
>   ***********************************************************/
>  
> -int migrate_folio_extra(struct address_space *mapping, struct folio *dst,
> -		struct folio *src, enum migrate_mode mode, int extra_count)
> +static int __migrate_folio(struct address_space *mapping, struct folio *dst,
> +			   struct folio *src, void *src_private,
> +			   enum migrate_mode mode)
>  {
>  	int rc;
>  
> -	BUG_ON(folio_test_writeback(src));	/* Writeback must be complete */
> -
> -	rc = folio_migrate_mapping(mapping, dst, src, extra_count);
> -
> +	rc = folio_migrate_mapping(mapping, dst, src, 0);
>  	if (rc != MIGRATEPAGE_SUCCESS)
>  		return rc;
>  
> +	if (src_private)

src_private seems unneeded. It can be replaced with folio_get_private(src)?

Thanks.
.

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