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From: David Howells <dhowells@redhat.com>
To: willy@infradead.org, hch@lst.de, trond.myklebust@primarydata.com
Cc: Jens Axboe <axboe@kernel.dk>,
	"Darrick J. Wong" <djwong@kernel.org>,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-mm@kvack.org, dhowells@redhat.com, dhowells@redhat.com,
	darrick.wong@oracle.com, viro@zeniv.linux.org.uk,
	jlayton@kernel.org, torvalds@linux-foundation.org,
	linux-nfs@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 3/9] mm: Make swap_readpage() void
Date: Fri, 24 Sep 2021 18:18:24 +0100	[thread overview]
Message-ID: <163250390413.2330363.3248359518033939175.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <163250387273.2330363.13240781819520072222.stgit@warthog.procyon.org.uk>

None of the callers of swap_readpage() actually check its return value and,
indeed, the operation may still be in progress, so remove the return value.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Matthew Wilcox <willy@infradead.org>
cc: Christoph Hellwig <hch@lst.de>
cc: Jens Axboe <axboe@kernel.dk>
cc: Darrick J. Wong <djwong@kernel.org>
cc: linux-xfs@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
---

 include/linux/swap.h |    2 +-
 mm/page_io.c         |   11 +++--------
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 576d40e33b1f..293eba012d4f 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -416,7 +416,7 @@ extern void kswapd_stop(int nid);
 #include <linux/blk_types.h> /* for bio_end_io_t */
 
 /* linux/mm/page_io.c */
-extern int swap_readpage(struct page *page, bool do_poll);
+void swap_readpage(struct page *page, bool synchronous);
 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
 int __swap_writepage(struct page *page, struct writeback_control *wbc);
 extern int swap_set_page_dirty(struct page *page);
diff --git a/mm/page_io.c b/mm/page_io.c
index afd18f6ec09e..b9fe25101a39 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -352,10 +352,9 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc)
 	return 0;
 }
 
-int swap_readpage(struct page *page, bool synchronous)
+void swap_readpage(struct page *page, bool synchronous)
 {
 	struct bio *bio;
-	int ret = 0;
 	struct swap_info_struct *sis = page_swap_info(page);
 	blk_qc_t qc;
 	struct gendisk *disk;
@@ -382,15 +381,13 @@ int swap_readpage(struct page *page, bool synchronous)
 		struct file *swap_file = sis->swap_file;
 		struct address_space *mapping = swap_file->f_mapping;
 
-		ret = mapping->a_ops->readpage(swap_file, page);
-		if (!ret)
+		if (!mapping->a_ops->readpage(swap_file, page))
 			count_vm_event(PSWPIN);
 		goto out;
 	}
 
 	if (sis->flags & SWP_SYNCHRONOUS_IO) {
-		ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
-		if (!ret) {
+		if (!bdev_read_page(sis->bdev, swap_page_sector(page), page)) {
 			if (trylock_page(page)) {
 				swap_slot_free_notify(page);
 				unlock_page(page);
@@ -401,7 +398,6 @@ int swap_readpage(struct page *page, bool synchronous)
 		}
 	}
 
-	ret = 0;
 	bio = bio_alloc(GFP_KERNEL, 1);
 	bio_set_dev(bio, sis->bdev);
 	bio->bi_opf = REQ_OP_READ;
@@ -435,7 +431,6 @@ int swap_readpage(struct page *page, bool synchronous)
 
 out:
 	psi_memstall_leave(&pflags);
-	return ret;
 }
 
 int swap_set_page_dirty(struct page *page)



  parent reply	other threads:[~2021-09-24 17:20 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 17:17 [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles David Howells
2021-09-24 17:18 ` [PATCH v3 1/9] mm: Remove the callback func argument from __swap_writepage() David Howells
2021-09-24 17:18 ` [PATCH v3 2/9] mm: Add 'supports' field to the address_space_operations to list features David Howells
2021-09-24 20:10   ` Matthew Wilcox
2021-09-24 17:18 ` David Howells [this message]
2021-09-24 22:07   ` [PATCH v3 3/9] mm: Make swap_readpage() void Matthew Wilcox
2021-09-24 17:18 ` [PATCH v3 4/9] Introduce IOCB_SWAP kiocb flag to trigger REQ_SWAP David Howells
2021-09-26 21:56   ` Dave Chinner
2021-09-24 17:18 ` [PATCH v3 5/9] mm: Make swap_readpage() for SWP_FS_OPS use ->swap_rw() not ->readpage() David Howells
2021-09-24 17:18 ` [PATCH v3 6/9] mm: Make __swap_writepage() do async DIO if asked for it David Howells
2021-09-24 17:19 ` [PATCH v3 7/9] nfs: Fix write to swapfile failure due to generic_write_checks() David Howells
2021-09-24 17:19 ` [PATCH v3 8/9] block, btrfs, ext4, xfs: Implement swap_rw David Howells
2021-09-24 17:19 ` [PATCH v3 9/9] mm: Remove swap BIO paths and only use DIO paths David Howells
2021-09-25 14:56   ` Matthew Wilcox
2021-09-25 15:36   ` David Howells
2021-09-25 17:09     ` Matthew Wilcox
2021-09-26 23:08       ` Damien Le Moal
2021-09-27  1:25         ` Dave Chinner
2021-09-27  1:41           ` Damien Le Moal
2021-09-27 20:03     ` David Sterba
2021-09-25 23:42 ` [RFC][PATCH v3 0/9] mm: Use DIO for swap and fix NFS swapfiles Dave Chinner
2021-09-26  3:10   ` Matthew Wilcox
2021-09-26 22:36     ` Dave Chinner
2021-09-27 20:07 ` David Sterba
2021-09-28  3:11 ` NeilBrown
2021-09-30 15:54   ` Steve French
2021-09-30 15:54     ` Steve French
2021-09-29 15:45 ` David Howells

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