diff mbox series

[20/24] swap: simplify and make swap_find_cache static

Message ID 20231119194740.94101-21-ryncsn@gmail.com
State New
Headers
Series Swapin path refactor for optimization and bugfix |

Commit Message

Kairui Song Nov. 19, 2023, 7:47 p.m. UTC 
  From: Kairui Song <kasong@tencent.com>

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@tencent.com>
---
 mm/swap.h       | 2 --
 mm/swap_state.c | 5 ++---
 2 files changed, 2 insertions(+), 5 deletions(-)

Comments

Chris Li Nov. 22, 2023, 5:01 a.m. UTC | #1 
On Sun, Nov 19, 2023 at 11:49 AM Kairui Song <ryncsn@gmail.com> wrote:
>
> From: Kairui Song <kasong@tencent.com>
>
> 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@tencent.com>
> ---
>  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
diff mbox series

Patch

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;
 		return NULL;
 	}