Re: [PATCH v4 4/5] Coresight: Add Coresight TMC Control Unit driver

[Markus Elfring]

…
> +++ b/drivers/hwtracing/coresight/coresight-ctcu.c
> @@ -0,0 +1,292 @@
…
> +static int __ctcu_set_etr_traceid(struct coresight_device *csdev,
> +				  u8 traceid,
> +				  int port_num,
> +				  bool enable)
> +{
…
> +	spin_lock_irqsave(&drvdata->spin_lock, flags);
> +	CS_UNLOCK(drvdata->base);
…
> +	CS_LOCK(drvdata->base);
> +	spin_unlock_irqrestore(&drvdata->spin_lock, flags);
> +
> +	return 0;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(spinlock_irqsave)(&drvdata->spin_lock);”?
https://elixir.bootlin.com/linux/v6.11-rc5/source/include/linux/spinlock.h#L572

Regards,
Markus