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Date: Tue, 6 Oct 2015 22:27:41 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com Subject: Re: [PATCH tip/core/rcu 10/13] rcu: Add rcu_pointer_handoff() 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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