# \[PATCH V2 6/6\] coresight-stm: adding driver for CoreSight STM component

- From: Alexander Shishkin \<alexander.shishkin@linux.intel.com\>
- Date: 2016-02-05 13:06:34 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2016/02/4678826
- Thread: https://ratatoskr.run/linux-arm-kernel/2016/02/4676229/t.md

```text
Chunyan Zhang [ref] writes:

> +#ifndef CONFIG_64BIT
> +static inline void __raw_writeq(u64 val, volatile void __iomem *addr)
> +{
> +	asm volatile("strd %1, %0"
> +		     : "+Qo" (*(volatile u64 __force *)addr)
> +		     : "r" (val));
> +}

Is it really ok to do this for all !64bit arms, inside a driver, just
like that? I'm not an expert, but I'm pretty sure there's more to it.

Regards,
--
Alex
```