mm/swap: convert put_swap_page() to put_swap_folio()

With all callers now using a folio, we can convert this function.

Link: https://lkml.kernel.org/r/20220902194653.1739778-14-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/swap.h

@@ -491,7 +491,7 @@ static inline long get_nr_swap_pages(void)
 extern void si_swapinfo(struct sysinfo *);
 swp_entry_t folio_alloc_swap(struct folio *folio);
 bool folio_free_swap(struct folio *folio);
-extern void put_swap_page(struct page *page, swp_entry_t entry);
+void put_swap_folio(struct folio *folio, swp_entry_t entry);
 extern swp_entry_t get_swap_page_of_type(int);
 extern int get_swap_pages(int n, swp_entry_t swp_entries[], int entry_size);
 extern int add_swap_count_continuation(swp_entry_t, gfp_t);
@@ -576,7 +576,7 @@ static inline void swap_free(swp_entry_t swp)
 {
 }
 
-static inline void put_swap_page(struct page *page, swp_entry_t swp)
+static inline void put_swap_folio(struct folio *folio, swp_entry_t swp)
 {
 }
 

mm/shmem.c

@@ -1424,7 +1424,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
 	}
 
 	mutex_unlock(&shmem_swaplist_mutex);
-	put_swap_page(&folio->page, swap);
+	put_swap_folio(folio, swap);
 redirty:
 	folio_mark_dirty(folio);
 	if (wbc->for_reclaim)

mm/swap_slots.c

@@ -343,7 +343,7 @@ swp_entry_t folio_alloc_swap(struct folio *folio)
 	get_swap_pages(1, &entry, 1);
 out:
 	if (mem_cgroup_try_charge_swap(folio, entry)) {
-		put_swap_page(&folio->page, entry);
+		put_swap_folio(folio, entry);
 		entry.val = 0;
 	}
 	return entry;

mm/swap_state.c

@@ -218,7 +218,7 @@ bool add_to_swap(struct folio *folio)
 	return true;
 
 fail:
-	put_swap_page(&folio->page, entry);
+	put_swap_folio(folio, entry);
 	return false;
 }
 
@@ -237,7 +237,7 @@ void delete_from_swap_cache(struct folio *folio)
 	__delete_from_swap_cache(folio, entry, NULL);
 	xa_unlock_irq(&address_space->i_pages);
 
-	put_swap_page(&folio->page, entry);
+	put_swap_folio(folio, entry);
 	folio_ref_sub(folio, folio_nr_pages(folio));
 }
 
@@ -498,7 +498,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
 	return &folio->page;
 
 fail_unlock:
-	put_swap_page(&folio->page, entry);
+	put_swap_folio(folio, entry);
 	folio_unlock(folio);
 	folio_put(folio);
 	return NULL;

mm/swapfile.c

@@ -1332,7 +1332,7 @@ void swap_free(swp_entry_t entry)
 /*
  * Called after dropping swapcache to decrease refcnt to swap entries.
  */
-void put_swap_page(struct page *page, swp_entry_t entry)
+void put_swap_folio(struct folio *folio, swp_entry_t entry)
 {
 	unsigned long offset = swp_offset(entry);
 	unsigned long idx = offset / SWAPFILE_CLUSTER;
@@ -1341,7 +1341,7 @@ void put_swap_page(struct page *page, swp_entry_t entry)
 	unsigned char *map;
 	unsigned int i, free_entries = 0;
 	unsigned char val;
-	int size = swap_entry_size(thp_nr_pages(page));
+	int size = swap_entry_size(folio_nr_pages(folio));
 
 	si = _swap_info_get(entry);
 	if (!si)

mm/vmscan.c

@@ -1352,7 +1352,7 @@ static int __remove_mapping(struct address_space *mapping, struct folio *folio,
 		mem_cgroup_swapout(folio, swap);
 		__delete_from_swap_cache(folio, swap, shadow);
 		xa_unlock_irq(&mapping->i_pages);
-		put_swap_page(&folio->page, swap);
+		put_swap_folio(folio, swap);
 	} else {
 		void (*free_folio)(struct folio *);