block: improve blk_op_str() comment

Replace XXX with what it actually means.

Signed-off-by: Damien Le Moal <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>

Author: damien-lemoal

block/blk-core.c

@@ -114,12 +114,12 @@ static const char *const blk_op_name[] = {
 #undef REQ_OP_NAME
 
 /**
- * blk_op_str - Return string XXX in the REQ_OP_XXX.
- * @op: REQ_OP_XXX.
+ * blk_op_str - Return the string "name" for an operation REQ_OP_name.
+ * @op: a request operation.
  *
- * Description: Centralize block layer function to convert REQ_OP_XXX into
- * string format. Useful in the debugging and tracing bio or request. For
- * invalid REQ_OP_XXX it returns string "UNKNOWN".
+ * Convert a request operation REQ_OP_name into the string "name". Useful for
+ * debugging and tracing BIOs and requests. For an invalid request operation
+ * code, the string "UNKNOWN" is returned.
  */
 inline const char *blk_op_str(enum req_op op)
 {

include/linux/blkdev.h

@@ -1026,7 +1026,7 @@ extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
 extern void blk_queue_exit(struct request_queue *q);
 extern void blk_sync_queue(struct request_queue *q);
 
-/* Helper to convert REQ_OP_XXX to its string format XXX */
+/* Convert a request operation REQ_OP_name into the string "name" */
 extern const char *blk_op_str(enum req_op op);
 
 int blk_status_to_errno(blk_status_t status);