linux-ext4 - [PATCH 27/35] shmem: Use pagevec_lookup() in shmem_unlock

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Message-Id: <20170601093245.29238-28-jack@suse.cz>
Date:   Thu,  1 Jun 2017 11:32:37 +0200
From:   Jan Kara <jack@...e.cz>
To:     <linux-mm@...ck.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        David Howells <dhowells@...hat.com>,
        linux-afs@...ts.infradead.org,
        Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
        linux-nilfs@...r.kernel.org, Bob Peterson <rpeterso@...hat.com>,
        cluster-devel@...hat.com, Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-f2fs-devel@...ts.sourceforge.net, tytso@....edu,
        linux-ext4@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
        "Yan, Zheng" <zyan@...hat.com>, ceph-devel@...r.kernel.org,
        linux-btrfs@...r.kernel.org, David Sterba <dsterba@...e.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org,
        Nadia Yvette Chambers <nyc@...omorphy.com>,
        Jan Kara <jack@...e.cz>
Subject: [PATCH 27/35] shmem: Use pagevec_lookup() in shmem_unlock_mapping()

The comment about find_get_pages() returning if it finds a row of swap
entries seems to be stale. Use pagevec_lookup() in
shmem_unlock_mapping() to simplify the code.

CC: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 mm/shmem.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index e67d6ba4e98e..a614a9cfb58c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -729,24 +729,14 @@ unsigned long shmem_swap_usage(struct vm_area_struct *vma)
 void shmem_unlock_mapping(struct address_space *mapping)
 {
 	struct pagevec pvec;
-	pgoff_t indices[PAGEVEC_SIZE];
 	pgoff_t index = 0;
 
 	pagevec_init(&pvec, 0);
 	/*
 	 * Minor point, but we might as well stop if someone else SHM_LOCKs it.
 	 */
-	while (!mapping_unevictable(mapping)) {
-		/*
-		 * Avoid pagevec_lookup(): find_get_pages() returns 0 as if it
-		 * has finished, if it hits a row of PAGEVEC_SIZE swap entries.
-		 */
-		pvec.nr = find_get_entries(mapping, index,
-					   PAGEVEC_SIZE, pvec.pages, indices);
-		if (!pvec.nr)
-			break;
-		index = indices[pvec.nr - 1] + 1;
-		pagevec_remove_exceptionals(&pvec);
+	while (!mapping_unevictable(mapping) &&
+			pagevec_lookup(&pvec, mapping, &index)) {
 		check_move_unevictable_pages(pvec.pages, pvec.nr);
 		pagevec_release(&pvec);
 		cond_resched();
-- 
2.12.3