From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
v5.10.90-rt61-rc1 stable review patch.
If anyone has any objections, please let me know.
-----------
This aligns the patch ("stop_machine: Add function and caller debug
info) with commit
a8b62fd085050 ("stop_machine: Add function and caller debug info")
that was merged upstream and is slightly different.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
kernel/stop_machine.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index dbf585cf4b9f8..971d8acceaecb 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -51,7 +51,11 @@ static bool stop_machine_initialized = false;
void print_stop_info(const char *log_lvl, struct task_struct *task)
{
- struct cpu_stopper *stopper = this_cpu_ptr(&cpu_stopper);
+ /*
+ * If @task is a stopper task, it cannot migrate and task_cpu() is
+ * stable.
+ */
+ struct cpu_stopper *stopper = per_cpu_ptr(&cpu_stopper, task_cpu(task));
if (task != stopper->thread)
return;
--
2.33.1
