Endless soft-lockups for compiling workload since next-20200519

[Peter Zijlstra]

On Mon, May 25, 2020 at 03:21:05PM +0200, Peter Zijlstra wrote:
> -	flags = atomic_fetch_andnot(NOHZ_KICK_MASK, nohz_flags(this_cpu));
> -	if (!(flags & NOHZ_KICK_MASK))
> +	if (idle != CPU_IDLE)
>  		return false;
>  
>  	_nohz_idle_balance(this_rq, flags, idle);

Bah, I think I broke something there. Lemme go mend.