[PATCH] Add rtas_set_indicator_fast() for RTAS call without extended delay

[Paul Mackerras]

Haren Myneni writes:

> +	WARN_ON(rc == -2 || (rc >= 9900 && rc <= 9905));

This worries me... do we know for sure that RTAS will never return a
busy code?  If it could possibly return a busy code, and we can't
sleep, then we should spin doing the call again and again until it
works, I think.

Paul.