Re: [patch 58/63] futex: Prevent requeue_pi() lock nesting issue on RT

[Thomas Gleixner]

On Mon, Aug 02 2021 at 15:10, Peter Zijlstra wrote:

> On Mon, Aug 02, 2021 at 02:56:09PM +0200, Peter Zijlstra wrote:
>>  static inline int futex_requeue_pi_wakeup_sync(struct futex_q *q)
>>  {
>> +	int old, new;
>>  
>> +	old = atomic_read_acquire(&q->requeue_state);
>> +	do {
>>  		/* Is requeue done already? */
>> +		if (old >= Q_REQUEUE_PI_DONE)
>>  			break;
>
> I think that can be: return old; for slightly simpler code.

Yes.