diff options
Diffstat (limited to 'kernel/trace/trace_hwlat.c')
| -rw-r--r-- | kernel/trace/trace_hwlat.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c index d7c8e4ec3d9d..1e6db9cbe4dc 100644 --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * trace_hwlatdetect.c - A simple Hardware Latency detector. * @@ -35,9 +36,6 @@ * * Includes useful feedback from Clark Williams <clark@redhat.com> * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. */ #include <linux/kthread.h> #include <linux/tracefs.h> @@ -354,6 +352,9 @@ static int start_kthread(struct trace_array *tr) struct task_struct *kthread; int next_cpu; + if (WARN_ON(hwlat_kthread)) + return 0; + /* Just pick the first CPU on first iteration */ current_mask = &save_cpumask; get_online_cpus(); |