On 4/26/07, Amit K. Arora [off-list ref] wrote:

 /*
+ * ext4_ext_try_to_merge:
+ * tries to merge the "ex" extent to the next extent in the tree.
+ * It always tries to merge towards right. If you want to merge towards
+ * left, pass "ex - 1" as argument instead of "ex".
+ * Returns 0 if the extents (ex and ex+1) were _not_ merged and returns
+ * 1 if they got merged.
+ */
+int ext4_ext_try_to_merge(struct inode *inode,
+                               struct ext4_ext_path *path,
+                               struct ext4_extent *ex)
+{

Please either use proper kerneldoc format or drop
"ext4_ext_try_to_merge" from the comment.