[PATCH 1/9] coresight: change coresight_device lock type to raw_spinlock_t

[Yeo Reum Yun]

Hi Steven,

> We should start documenting what is not real-time "safe". That is, if this
> code is executed, we have a loop here that holds a raw spin lock. This
> appears to make the time the raw spin lock held to be non deterministic.
> 
> If someone is running PREEMPT_RT and expects deterministic behavior, they
> cannot be using this code. That is fine, but we should probably create a
> document somewhere that notes this.
>
> -- Steve

I think it's quite deterministic becase the number of loop currently
determined by the number of preload_feats.

Also, I don't think the number of  feats will be loaded as much as
it can do undeterministic behavior since 
the number is not many and it is quite predictable.

Thanks.