Re: [PATCH bpf-next v1 08/22] rqspinlock: Protect pending bit owners from stalls

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Tue, Jan 07, 2025 at 05:59:50AM -0800, Kumar Kartikeya Dwivedi wrote:
> +	if (val & _Q_LOCKED_MASK) {
> +		RES_RESET_TIMEOUT(ts);
> +		smp_cond_load_acquire(&lock->locked, !VAL || RES_CHECK_TIMEOUT(ts, ret));
> +	}

Please check how smp_cond_load_acquire() works on ARM64 and then add
some words on how RES_CHECK_TIMEOUT() is still okay.