This is a note to let you know that I've just added the patch titled
trace/hwlat: Do not wipe the contents of per-cpu thread data
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
trace-hwlat-do-not-wipe-the-contents-of-per-cpu-thread-data.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4c42f5f0d1dd20bddd9f940beb1e6ccad60c4498 Mon Sep 17 00:00:00 2001
From: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
Date: Fri, 10 Mar 2023 12:04:50 +0200
Subject: trace/hwlat: Do not wipe the contents of per-cpu thread data
From: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
commit 4c42f5f0d1dd20bddd9f940beb1e6ccad60c4498 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@xxxxxxxxxxxxxxx/
Link: https://lkml.kernel.org/r/20230310100451.3948583-2-tero.kristo@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: f46b16520a087 ("trace/hwlat: Implement the per-cpu mode")
Signed-off-by: Tero Kristo <tero.kristo@xxxxxxxxxxxxxxx>
Acked-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_hwlat.c | 3 ---
1 file changed, 3 deletions(-)
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -584,9 +584,6 @@ static int start_per_cpu_kthreads(struct
*/
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)
Patches currently in stable-queue which might be from tero.kristo@xxxxxxxxxxxxxxx are
queue-6.2/trace-hwlat-do-not-start-per-cpu-thread-if-it-is-already-running.patch
queue-6.2/trace-hwlat-do-not-wipe-the-contents-of-per-cpu-thread-data.patch
