mm: remove nr_pages argument from pagevec_lookup{,_range}()

All users of pagevec_lookup() and pagevec_lookup_range() now pass
PAGEVEC_SIZE as a desired number of pages.

Just drop the argument.

Link: http://lkml.kernel.org/r/20170726114704.7626-11-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 7263448..484c132 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -468,7 +468,7 @@ static int ext4_find_unwritten_pgoff(struct inode *inode,
 		unsigned long nr_pages;
 
 		nr_pages = pagevec_lookup_range(&pvec, inode->i_mapping,
-					&index, end, PAGEVEC_SIZE);
+					&index, end);
 		if (nr_pages == 0)
 			break;