Björn Töpel <bjorn.topel@xxxxxxxxx> writes: > From: Björn Töpel <bjorn.topel@xxxxxxxxx> > > After the RCU flavor consolidation [1], call_rcu() and > synchronize_rcu() waits for preempt-disable regions (NAPI) in addition > to the read-side critical sections. As a result of this, the cleanup > code in devmap can be simplified > > * There is no longer a need to flush in __dev_map_entry_free, since we > know that this has been done when the call_rcu() callback is > triggered. > > * When freeing the map, there is no need to explicitly wait for a > flush. It's guaranteed to be done after the synchronize_rcu() call > in dev_map_free(). The rcu_barrier() is still needed, so that the > map is not freed prior the elements. > > [1] https://lwn.net/Articles/777036/ > > Signed-off-by: Björn Töpel <bjorn.topel@xxxxxxxxx> Acked-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
