Re: [PATCH tip/core/rcu 10/13] rcu: Add rcu_pointer_handoff()

[Peter Zijlstra]

On Tue, Oct 06, 2015 at 09:13:45AM -0700, Paul E. McKenney wrote:
>  /**
> + * rcu_pointer_handoff() - Hand off a pointer from RCU to other mechanism
> + * @p: The pointer to hand off
> + *
> + * This is simply an identity function, but it documents where a pointer
> + * is handed off from RCU to some other synchronization mechanism, for
> + * example, reference counting or locking.  In C11, it would map to
> + * kill_dependency().  It could be used as follows:
> + *
> + *	rcu_read_lock();
> + *	p = rcu_dereference(gp);
> + *	long_lived = is_long_lived(p);
> + *	if (long_lived) {
> + *		if (!atomic_inc_not_zero(p->refcnt))
> + *			long_lived = false;
> + *		else
> + *			p = rcu_pointer_handoff(p);
> + *	}
> + *	rcu_read_unlock();
> + */
> +#define rcu_pointer_handoff(p) (p)

Will you actually be using this? It seems a tad pointless to add if you
don't.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/