[PATCH] mm: Add pagemap.h to the fine documentation

[Matthew Wilcox <willy@infradead.org>]

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

The documentation currently does not include the deathless prose
written to describe functions in pagemap.h because it's not included
in any rst file.  Fix up the mismatches between parameter names and the
documentation and add the file to mm-api.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 Documentation/core-api/mm-api.rst | 3 +++
 include/linux/pagemap.h           | 8 ++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/Documentation/core-api/mm-api.rst b/Documentation/core-api/mm-api.rst
index be726986ff75..2adffb3f7914 100644
--- a/Documentation/core-api/mm-api.rst
+++ b/Documentation/core-api/mm-api.rst
@@ -73,6 +73,9 @@ File Mapping and Page Cache
 .. kernel-doc:: mm/truncate.c
    :export:
 
+.. kernel-doc:: include/linux/pagemap.h
+   :internal:
+
 Memory pools
 ============
 
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index ccb14b6a16b5..6462df717cff 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -33,8 +33,8 @@ enum mapping_flags {
 
 /**
  * mapping_set_error - record a writeback error in the address_space
- * @mapping - the mapping in which an error should be set
- * @error - the error to set in the mapping
+ * @mapping: the mapping in which an error should be set
+ * @error: the error to set in the mapping
  *
  * When writeback fails in some way, we must record that error so that
  * userspace can be informed when fsync and the like are called.  We endeavor
@@ -305,9 +305,9 @@ static inline struct page *find_lock_page(struct address_space *mapping,
  * atomic allocation!
  */
 static inline struct page *find_or_create_page(struct address_space *mapping,
-					pgoff_t offset, gfp_t gfp_mask)
+					pgoff_t index, gfp_t gfp_mask)
 {
-	return pagecache_get_page(mapping, offset,
+	return pagecache_get_page(mapping, index,
 					FGP_LOCK|FGP_ACCESSED|FGP_CREAT,
 					gfp_mask);
 }
-- 
2.25.0