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authorTero Kristo <tero.kristo@linux.intel.com>2023-03-10 12:04:50 +0200
committerSteven Rostedt (Google) <rostedt@goodmis.org>2023-03-19 12:20:48 -0400
commit4c42f5f0d1dd20bddd9f940beb1e6ccad60c4498 (patch)
tree9ce9846af0c06e2a84abf1292a5c374dcfed265e /kernel
parent7a025e066e0f0afd39cc88a089929ccb945ce9e8 (diff)
trace/hwlat: Do not wipe the contents of per-cpu thread data
Do not wipe the contents of the per-cpu kthread data when starting the tracer, as this will completely forget about already running instances and can later start new additional per-cpu threads. Link: https://lore.kernel.org/all/20230302113654.2984709-1-tero.kristo@linux.intel.com/ Link: https://lkml.kernel.org/r/20230310100451.3948583-2-tero.kristo@linux.intel.com Cc: stable@vger.kernel.org Fixes: f46b16520a087 ("trace/hwlat: Implement the per-cpu mode") Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com> Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_hwlat.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index d440ddd5fd8b..edc26dc22c3f 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -584,9 +584,6 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
*/
cpumask_and(current_mask, cpu_online_mask, tr->tracing_cpumask);
- for_each_online_cpu(cpu)
- per_cpu(hwlat_per_cpu_data, cpu).kthread = NULL;
-
for_each_cpu(cpu, current_mask) {
retval = start_cpu_kthread(cpu);
if (retval)