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trace/hwlat: Do not wipe the contents of per-cpu thread data 

commit 4c42f5f0d1 upstream.

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: f46b16520a ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tero Kristo 2023-03-10 12:04:50 +02:00 committed by Greg Kroah-Hartman
parent 15f6110abd
commit a78eab86e2
1 changed files with 0 additions and 3 deletions
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3
kernel/trace/trace_hwlat.c
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@ -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)