Signed-off-by: Stefan Metzmacher <metze@xxxxxxxxx> --- fs/io-wq.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/fs/io-wq.c b/fs/io-wq.c index cd1af924c3d1..b80c5d905127 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -640,7 +640,19 @@ static void create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index) return; } - snprintf(tsk_comm, sizeof(tsk_comm), "iou-wrk-%d", wq->task->pid); + /* + * The limit value of pid_max_max/PID_MAX_LIMIT + * is 4 * 1024 * 1024 = 4194304. + * + * TASK_COMM_LEN is 16, so we have 15 chars to fill. + * + * With "iou-wrk-4194304" we just fit into 15 chars. + * If that ever changes we may better add some special + * handling for PF_IO_WORKER in proc_task_name(), as that + * allows up to 63 chars. + */ + WARN_ON(snprintf(tsk_comm, sizeof(tsk_comm), + "iou-wrk-%d", wq->task->pid) >= sizeof(tsk_comm)); set_task_comm(tsk, tsk_comm); tsk->pf_io_worker = worker; -- 2.25.1
