linux-kernel - Re: [PATCH] mm: move get_page_from_free_area() to mm/page

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Date:   Sun, 19 Mar 2023 12:07:43 +0000
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: move get_page_from_free_area() to mm/page_alloc.c

On Sun, Mar 19, 2023 at 01:42:14PM +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
>
> The get_page_from_free_area() helper is only used in mm/page_alloc.c so
> move it there to reduce noise in include/linux/mmzone.h
>
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---
>  include/linux/mmzone.h | 7 -------
>  mm/page_alloc.c        | 7 +++++++
>  2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 96599cb9eb62..8f5a9e2c722a 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -108,13 +108,6 @@ struct free_area {
>  	unsigned long		nr_free;
>  };
>
> -static inline struct page *get_page_from_free_area(struct free_area *area,
> -					    int migratetype)
> -{
> -	return list_first_entry_or_null(&area->free_list[migratetype],
> -					struct page, lru);
> -}
> -
>  static inline bool free_area_empty(struct free_area *area, int migratetype)
>  {
>  	return list_empty(&area->free_list[migratetype]);
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 87d760236dba..2e72fdbdd8db 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1048,6 +1048,13 @@ static inline void del_page_from_free_list(struct page *page, struct zone *zone,
>  	zone->free_area[order].nr_free--;
>  }
>
> +static inline struct page *get_page_from_free_area(struct free_area *area,
> +					    int migratetype)
> +{
> +	return list_first_entry_or_null(&area->free_list[migratetype],
> +					struct page, lru);
> +}
> +
>  /*
>   * If this is not the largest possible page, check if the buddy
>   * of the next-highest order is free. If it is, it's possible
>
> base-commit: 4018ab1f7cec061b8425737328edefebdc0ab832
> --
> 2.35.1
>

Good catch, I wonder if there are more functions like this that can be dropped
from headers?

Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>