io_uring: correct comment for IORING_SETUP_TASKRUN_FLAG

Sync with a recent liburing fix, which corrects the comment explaining
when the IORING_SETUP_TASKRUN_FLAG setup flag is valid to use. May be
use with COOP_TASKRUN or DEFER_TASKRUN, not useful without either of
this task_work mechanisms being used.

Link: axboe/liburing#1543
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

include/uapi/linux/io_uring.h

@@ -188,7 +188,8 @@ enum io_uring_sqe_flags_bit {
 /*
  * If COOP_TASKRUN is set, get notified if task work is available for
  * running and a kernel transition would be needed to run it. This sets
- * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
+ * IORING_SQ_TASKRUN in the sq ring flags. Not valid without COOP_TASKRUN
+ * or DEFER_TASKRUN.
  */
 #define IORING_SETUP_TASKRUN_FLAG	(1U << 9)
 #define IORING_SETUP_SQE128		(1U << 10) /* SQEs are 128 byte */