kernel/stop_machine.c: kernel-doc warning fix

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/stop_machine.c

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 01fbae5..695f0c6 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -307,6 +307,7 @@
  * @cpu: cpu to stop
  * @fn: function to execute
  * @arg: argument to @fn
+ * @work_buf: pointer to cpu_stop_work structure
  *
  * Similar to stop_one_cpu() but doesn't wait for completion.  The
  * caller is responsible for ensuring @work_buf is currently unused