On Mon, May 22, 2023 at 12:09 AM Huang Ying <ying.huang@xxxxxxxxx> wrote:
>
> __swap_count() is called in do_swap_page() only, which encloses the
> call site with get/put_swap_device() already.
>
> Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
> Cc: David Hildenbrand <david@xxxxxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
> Cc: Yang Shi <shy828301@xxxxxxxxx>
> Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
> ---
> mm/swapfile.c | 10 ++--------
> 1 file changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 274bbf797480..8419cba9c192 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1432,16 +1432,10 @@ void swapcache_free_entries(swp_entry_t *entries, int n)
>
nit: I would add a comment here that the caller needs get/put_swap_device().
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
> int __swap_count(swp_entry_t entry)
> {
> - struct swap_info_struct *si;
> + struct swap_info_struct *si = swp_swap_info(entry);
> pgoff_t offset = swp_offset(entry);
> - int count = 0;
>
> - si = get_swap_device(entry);
> - if (si) {
> - count = swap_count(si->swap_map[offset]);
> - put_swap_device(si);
> - }
> - return count;
> + return swap_count(si->swap_map[offset]);
> }
>
> /*
> --
> 2.39.2
>
>
