Re: [RFC 1/1] rwsem: Shrink rwsem by one pointer

[Peter Zijlstra <peterz@infradead.org>]

On Wed, Feb 18, 2026 at 09:00:14PM +0000, Matthew Wilcox wrote:

> Here's all the changes I made, and I'll post a rolled-up version
> next.

That all seems reasonable.

One small nit:

> +	if (list_empty(&waiter->list)) {
> +		sem->first_waiter = NULL;
> +		return true;
>  	}
>  
> +	if (sem->first_waiter == waiter)
> +		sem->first_waiter = list_first_entry(&waiter->list,
> +				struct rwsem_waiter, list);

Since that's multiple lines, could you wrap in {}, also I tend to prefer
cino=(0:0 style wrapping. That is, something like so:

        if (sem->first_waiter == waiter) {
                sem->first_waiter = list_first_entry(&waiter->list,
                                                     struct rwsem_waiter, list);
        }


> +	list_del(&waiter->list);
> +
>  	return false;
>  }