On Sun, Nov 19, 2023 at 11:49 AM Kairui Song <ryncsn@xxxxxxxxx> wrote:
>
> From: Kairui Song <kasong@xxxxxxxxxxx>
>
> There are only two callers within the same file now, make it static and
> drop the redundant if check on the shadow variable.
>
> Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
> ---
> mm/swap.h | 2 --
> mm/swap_state.c | 5 ++---
> 2 files changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/mm/swap.h b/mm/swap.h
> index b073c29c9790..4402970547e7 100644
> --- a/mm/swap.h
> +++ b/mm/swap.h
> @@ -46,8 +46,6 @@ void __delete_from_swap_cache(struct folio *folio,
> void delete_from_swap_cache(struct folio *folio);
> void clear_shadow_from_swap_cache(int type, unsigned long begin,
> unsigned long end);
> -struct folio *swap_cache_get_folio(swp_entry_t entry,
> - struct vm_fault *vmf, void **shadowp);
> struct folio *filemap_get_incore_folio(struct address_space *mapping,
> pgoff_t index);
>
> diff --git a/mm/swap_state.c b/mm/swap_state.c
> index eef66757c615..6f39aa8394f1 100644
> --- a/mm/swap_state.c
> +++ b/mm/swap_state.c
> @@ -334,15 +334,14 @@ static inline bool swap_use_vma_readahead(struct swap_info_struct *si)
> *
> * Caller must lock the swap device or hold a reference to keep it valid.
> */
> -struct folio *swap_cache_get_folio(swp_entry_t entry, struct vm_fault *vmf, void **shadowp)
> +static struct folio *swap_cache_get_folio(swp_entry_t entry, struct vm_fault *vmf, void **shadowp)
> {
> bool vma_ra, readahead;
> struct folio *folio;
>
> folio = filemap_get_entry(swap_address_space(entry), swp_offset(entry));
> if (xa_is_value(folio)) {
> - if (shadowp)
> - *shadowp = folio;
> + *shadowp = folio;
I prefer to keep the original code to perform the check before
assigning it. The caller usage situation might change.
It is more defensive.
Does not seem to justify it as a standalone patch.
Chris
