On Wed, Jun 12, 2013 at 01:46:27PM -0700, Tejun Heo wrote: > From de3c0749e2c1960afcc433fc5da136b85c8bd896 Mon Sep 17 00:00:00 2001 > From: Tejun Heo <[email protected]> > Date: Wed, 12 Jun 2013 13:37:42 -0700 > > Implement percpu_tryget() which succeeds iff the refcount hasn't been > killed yet. Because the refcnt is per-cpu, different CPUs may have > different perceptions on when the counter has been killed and tryget() > may continue to succeed for a while after percpu_ref_kill() returns. > > For use cases where it's necessary to know when all CPUs start to see > the refcnt as dead, percpu_ref_kill_and_confirm() is added. The new > function takes an extra argument @confirm_kill which is invoked when > the refcnt is guaranteed to be viewed as killed on all CPUs. > > While this isn't the prettiest interface, it doesn't force synchronous > wait and is much safer than requiring the caller to do its own > call_rcu(). > > Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Kent Overstreet <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
