linux-kernel - Re: [PATCH 06/12] mm/swapfile.c: update the code comment above swap_count

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Message-ID: <CAMgjq7CHrN4cmS-JACUphQHKwv7gQdcCbzYRQ_H+ORBa4tJ7uQ@mail.gmail.com>
Date: Thu, 6 Feb 2025 15:50:47 +0800
From: Kairui Song <ryncsn@...il.com>
To: Baoquan He <bhe@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	akpm@...ux-foundation.org, chrisl@...nel.org
Subject: Re: [PATCH 06/12] mm/swapfile.c: update the code comment above swap_count_continued()

On Wed, Feb 5, 2025 at 5:28 PM Baoquan He <bhe@...hat.com> wrote:
>
> Now, swap_count_continued() has two callers, __swap_duplicate() and
> __swap_entry_free_locked(), the relevant code comment is stale.
> Update it to reflect the current situation.
>
> Signed-off-by: Baoquan He <bhe@...hat.com>
> ---
>  mm/swapfile.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index bf284ba16198..9ee2238042a5 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -3789,8 +3789,8 @@ int add_swap_count_continuation(swp_entry_t entry, gfp_t gfp_mask)
>   * into, carry if so, or else fail until a new continuation page is allocated;
>   * when the original swap_map count is decremented from 0 with continuation,
>   * borrow from the continuation and report whether it still holds more.
> - * Called while __swap_duplicate() or swap_entry_free() holds swap or cluster
> - * lock.
> + * Called while __swap_duplicate() or caller of __swap_entry_free_locked()
> + * holds swap or cluster lock.

It should be only "cluster lock" not "swap or cluster lock" now?

>   */
>  static bool swap_count_continued(struct swap_info_struct *si,
>                                  pgoff_t offset, unsigned char count)
> --
> 2.41.0
>