readahead: docbook fix

Minor docbook error since argument name in comment doesn't match function

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 6cf700d41844..49a6fe375d01 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -843,7 +843,7 @@ static void shrink_readahead_size_eio(struct file *filp,
 /**
  * do_generic_mapping_read - generic file read routine
  * @mapping:    address_space to be read
- * @ra:         file's readahead state
+ * @_ra:        file's readahead state
  * @filp:       the file to read
  * @ppos:       current file position
  * @desc:       read_descriptor