linux-kernel - Re: [PATCH] mm/balloon_compaction: make balloon page compaction callbacks static

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Date:   Tue, 25 Jan 2022 12:59:08 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, david@...hat.com,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/balloon_compaction: make balloon page compaction
 callbacks static

On Tue, Jan 25, 2022 at 09:22:21PM +0800, Miaohe Lin wrote:
> Since commit b1123ea6d3b3 ("mm: balloon: use general non-lru movable page
> feature"), these functions are called via balloon_aops callbacks. They're
> not called directly outside this file. So make them static and clean up
> the relevant code.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

I'll queue this unless someone else does first.

> ---
>  include/linux/balloon_compaction.h | 22 ----------------------
>  mm/balloon_compaction.c            |  6 +++---
>  2 files changed, 3 insertions(+), 25 deletions(-)
> 
> diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
> index 338aa27e4773..edb7f6d41faa 100644
> --- a/include/linux/balloon_compaction.h
> +++ b/include/linux/balloon_compaction.h
> @@ -80,12 +80,6 @@ static inline void balloon_devinfo_init(struct balloon_dev_info *balloon)
>  
>  #ifdef CONFIG_BALLOON_COMPACTION
>  extern const struct address_space_operations balloon_aops;
> -extern bool balloon_page_isolate(struct page *page,
> -				isolate_mode_t mode);
> -extern void balloon_page_putback(struct page *page);
> -extern int balloon_page_migrate(struct address_space *mapping,
> -				struct page *newpage,
> -				struct page *page, enum migrate_mode mode);
>  
>  /*
>   * balloon_page_insert - insert a page into the balloon's page list and make
> @@ -155,22 +149,6 @@ static inline void balloon_page_delete(struct page *page)
>  	list_del(&page->lru);
>  }
>  
> -static inline bool balloon_page_isolate(struct page *page)
> -{
> -	return false;
> -}
> -
> -static inline void balloon_page_putback(struct page *page)
> -{
> -	return;
> -}
> -
> -static inline int balloon_page_migrate(struct page *newpage,
> -				struct page *page, enum migrate_mode mode)
> -{
> -	return 0;
> -}
> -
>  static inline gfp_t balloon_mapping_gfp_mask(void)
>  {
>  	return GFP_HIGHUSER;
> diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
> index 907fefde2572..4b8eab4b3f45 100644
> --- a/mm/balloon_compaction.c
> +++ b/mm/balloon_compaction.c
> @@ -203,7 +203,7 @@ EXPORT_SYMBOL_GPL(balloon_page_dequeue);
>  
>  #ifdef CONFIG_BALLOON_COMPACTION
>  
> -bool balloon_page_isolate(struct page *page, isolate_mode_t mode)
> +static bool balloon_page_isolate(struct page *page, isolate_mode_t mode)
>  
>  {
>  	struct balloon_dev_info *b_dev_info = balloon_page_device(page);
> @@ -217,7 +217,7 @@ bool balloon_page_isolate(struct page *page, isolate_mode_t mode)
>  	return true;
>  }
>  
> -void balloon_page_putback(struct page *page)
> +static void balloon_page_putback(struct page *page)
>  {
>  	struct balloon_dev_info *b_dev_info = balloon_page_device(page);
>  	unsigned long flags;
> @@ -230,7 +230,7 @@ void balloon_page_putback(struct page *page)
>  
>  
>  /* move_to_new_page() counterpart for a ballooned page */
> -int balloon_page_migrate(struct address_space *mapping,
> +static int balloon_page_migrate(struct address_space *mapping,
>  		struct page *newpage, struct page *page,
>  		enum migrate_mode mode)
>  {
> -- 
> 2.23.0