[PATCH 2/7] mm: remove the swap_readpage return value

[Christoph Hellwig <hch@xxxxxx>]

swap_readpage always returns 0, and no caller checks the return value.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 mm/page_io.c | 16 +++++-----------
 mm/swap.h    |  7 +++----
 2 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/mm/page_io.c b/mm/page_io.c
index 3a5f921b932e82..6f7166fdc4b2bb 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -445,11 +445,9 @@ static void swap_readpage_fs(struct page *page,
 		*plug = sio;
 }
 
-int swap_readpage(struct page *page, bool synchronous,
-		  struct swap_iocb **plug)
+void swap_readpage(struct page *page, bool synchronous, struct swap_iocb **plug)
 {
 	struct bio *bio;
-	int ret = 0;
 	struct swap_info_struct *sis = page_swap_info(page);
 	bool workingset = PageWorkingset(page);
 	unsigned long pflags;
@@ -481,15 +479,12 @@ int swap_readpage(struct page *page, bool synchronous,
 		goto out;
 	}
 
-	if (sis->flags & SWP_SYNCHRONOUS_IO) {
-		ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
-		if (!ret) {
-			count_vm_event(PSWPIN);
-			goto out;
-		}
+	if ((sis->flags & SWP_SYNCHRONOUS_IO) &&
+	    !bdev_read_page(sis->bdev, swap_page_sector(page), page)) {
+		count_vm_event(PSWPIN);
+		goto out;
 	}
 
-	ret = 0;
 	bio = bio_alloc(sis->bdev, 1, REQ_OP_READ, GFP_KERNEL);
 	bio->bi_iter.bi_sector = swap_page_sector(page);
 	bio->bi_end_io = end_swap_bio_read;
@@ -521,7 +516,6 @@ int swap_readpage(struct page *page, bool synchronous,
 		psi_memstall_leave(&pflags);
 	}
 	delayacct_swapin_end();
-	return ret;
 }
 
 void __swap_read_unplug(struct swap_iocb *sio)
diff --git a/mm/swap.h b/mm/swap.h
index f78065c8ef524b..f5eb5069d28c2e 100644
--- a/mm/swap.h
+++ b/mm/swap.h
@@ -8,8 +8,7 @@
 /* linux/mm/page_io.c */
 int sio_pool_init(void);
 struct swap_iocb;
-int swap_readpage(struct page *page, bool do_poll,
-		  struct swap_iocb **plug);
+void swap_readpage(struct page *page, bool do_poll, struct swap_iocb **plug);
 void __swap_read_unplug(struct swap_iocb *plug);
 static inline void swap_read_unplug(struct swap_iocb *plug)
 {
@@ -64,8 +63,8 @@ static inline unsigned int folio_swap_flags(struct folio *folio)
 }
 #else /* CONFIG_SWAP */
 struct swap_iocb;
-static inline int swap_readpage(struct page *page, bool do_poll,
-				struct swap_iocb **plug)
+static inline void swap_readpage(struct page *page, bool do_poll,
+		struct swap_iocb **plug)
 {
 	return 0;
 }
-- 
2.39.0