Re: [PATCH v4 03/15] coresight: Register CPU PM notifier in core layer

On Tue, Nov 11, 2025 at 12:13:38PM +0000, Suzuki Kuruppassery Poulose wrote:

[...]

...

--- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c

...

+static int coresight_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,

• 		   void *v)
  

+{

• unsigned int cpu = smp_processor_id();
• struct coresight_device *source = per_cpu(csdev_source, cpu);
• if (!coresight_pm_is_needed(source))

• return NOTIFY_OK;
  

• switch (cmd) {
• case CPU_PM_ENTER:

• if (coresight_pm_save(source))
  

Unless we do the "set_per_cpu_source" *ON the CPU*, what guarantees that this will vanish while we do the PM save ? e.g., UNLOAD coresight_etm4x driver

Good catch! I will use SMP call to set per CPU source in next version.

Thanks, Leo