mm: migrate: drop unused argument of migrate_page_move_mapping()

All callers of migrate_page_move_mapping() now pass NULL for 'head'
argument.  Drop it.

Link: http://lkml.kernel.org/r/20181211172143.7358-7-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 8 insertions, 10 deletions

diff --git a/fs/aio.c b/fs/aio.c
index aac9659381d2..bc401d5bcdc2 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -409,7 +409,7 @@ static int aio_migratepage(struct address_space *mapping, struct page *new,
         BUG_ON(PageWriteback(old));
         get_page(new);
 
-        rc = migrate_page_move_mapping(mapping, new, old, NULL, mode, 1);
+        rc = migrate_page_move_mapping(mapping, new, old, mode, 1);
         if (rc != MIGRATEPAGE_SUCCESS) {
                 put_page(new);
                 goto out_unlock;
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b293cb3e27a2..008b74eff00d 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2738,7 +2738,7 @@ int f2fs_migrate_page(struct address_space *mapping,
          */
         extra_count = (atomic_written ? 1 : 0) - page_has_private(page);
         rc = migrate_page_move_mapping(mapping, newpage,
-                                page, NULL, mode, extra_count);
+                                page, mode, extra_count);
         if (rc != MIGRATEPAGE_SUCCESS) {
                 if (atomic_written)
                         mutex_unlock(&fi->inmem_lock);
diff --git a/fs/iomap.c b/fs/iomap.c
index ce837d962d47..2d9b93cc4930 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -563,7 +563,7 @@ iomap_migrate_page(struct address_space *mapping, struct page *newpage,
 {
         int ret;
 
-        ret = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);
+        ret = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
         if (ret != MIGRATEPAGE_SUCCESS)
                 return ret;
 
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 1b78f2e09218..5d2ffb1a45fc 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1481,7 +1481,7 @@ static int ubifs_migrate_page(struct address_space *mapping,
 {
         int rc;
 
-        rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);
+        rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
         if (rc != MIGRATEPAGE_SUCCESS)
                 return rc;
 
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 617615fa11ce..e13d9bf2f9a5 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -77,8 +77,7 @@ extern void migrate_page_copy(struct page *newpage, struct page *page);
 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
                                   struct page *newpage, struct page *page);
 extern int migrate_page_move_mapping(struct address_space *mapping,
-                struct page *newpage, struct page *page,
-                struct buffer_head *head, enum migrate_mode mode,
+                struct page *newpage, struct page *page, enum migrate_mode mode,
                 int extra_count);
 #else
 
diff --git a/mm/migrate.c b/mm/migrate.c
index 8dd57601714f..4389696fba0e 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -399,8 +399,7 @@ static int expected_page_refs(struct page *page)
  * 3 for pages with a mapping and PagePrivate/PagePrivate2 set.
  */
 int migrate_page_move_mapping(struct address_space *mapping,
-                struct page *newpage, struct page *page,
-                struct buffer_head *head, enum migrate_mode mode,
+                struct page *newpage, struct page *page, enum migrate_mode mode,
                 int extra_count)
 {
         XA_STATE(xas, &mapping->i_pages, page_index(page));
@@ -687,7 +686,7 @@ int migrate_page(struct address_space *mapping,
 
         BUG_ON(PageWriteback(page));    /* Writeback must be complete */
 
-        rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);
+        rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
 
         if (rc != MIGRATEPAGE_SUCCESS)
                 return rc;
@@ -790,7 +789,7 @@ recheck_buffers:
                 }
         }
 
-        rc = migrate_page_move_mapping(mapping, newpage, page, NULL, mode, 0);
+        rc = migrate_page_move_mapping(mapping, newpage, page, mode, 0);
         if (rc != MIGRATEPAGE_SUCCESS)
                 goto unlock_buffers;