linux-kernel - Re: [PATCH 08/15] mm/swap: make page_swapcount and __lru_add_drain

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Date:   Wed, 18 May 2022 11:46:02 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, willy@...radead.org, vbabka@...e.cz,
        dhowells@...hat.com, neilb@...e.de, apopple@...dia.com,
        david@...hat.com, surenb@...gle.com, peterx@...hat.com,
        naoya.horiguchi@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/15] mm/swap: make page_swapcount and
 __lru_add_drain_all

On Mon, May 09, 2022 at 09:14:09PM +0800, Miaohe Lin wrote:
> Make page_swapcount and __lru_add_drain_all static. They are only used
> within the file now.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

I think the commit message is missing the "static" word.

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  include/linux/swap.h | 7 -------
>  mm/swap.c            | 2 +-
>  mm/swapfile.c        | 2 +-
>  3 files changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index 999c7d79c2d5..8772132d21dc 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -490,7 +490,6 @@ int swap_type_of(dev_t device, sector_t offset);
>  int find_first_swap(dev_t *device);
>  extern unsigned int count_swap_pages(int, int);
>  extern sector_t swapdev_block(int, pgoff_t);
> -extern int page_swapcount(struct page *);
>  extern int __swap_count(swp_entry_t entry);
>  extern int __swp_swapcount(swp_entry_t entry);
>  extern int swp_swapcount(swp_entry_t entry);
> @@ -562,12 +561,6 @@ static inline void put_swap_page(struct page *page, swp_entry_t swp)
>  {
>  }
>  
> -
> -static inline int page_swapcount(struct page *page)
> -{
> -	return 0;
> -}
> -
>  static inline int __swap_count(swp_entry_t entry)
>  {
>  	return 0;
> diff --git a/mm/swap.c b/mm/swap.c
> index 7e320ec08c6a..6d2c37f781f8 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -748,7 +748,7 @@ static void lru_add_drain_per_cpu(struct work_struct *dummy)
>   * Calling this function with cpu hotplug locks held can actually lead
>   * to obscure indirect dependencies via WQ context.
>   */
> -inline void __lru_add_drain_all(bool force_all_cpus)
> +static inline void __lru_add_drain_all(bool force_all_cpus)
>  {
>  	/*
>  	 * lru_drain_gen - Global pages generation number
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 7b4c99ca2aea..133e03fea104 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1430,7 +1430,7 @@ void swapcache_free_entries(swp_entry_t *entries, int n)
>   * This does not give an exact answer when swap count is continued,
>   * but does include the high COUNT_CONTINUED flag to allow for that.
>   */
> -int page_swapcount(struct page *page)
> +static int page_swapcount(struct page *page)
>  {
>  	int count = 0;
>  	struct swap_info_struct *p;
> -- 
> 2.23.0
> 
> 

-- 
Oscar Salvador
SUSE Labs