On Tue, 16 Oct 2012, Glauber Costa wrote: > It is useful to know how many charges are still left after a call to > res_counter_uncharge. While it is possible to issue a res_counter_read > after uncharge, this can be racy. > > If we need, for instance, to take some action when the counters drop > down to 0, only one of the callers should see it. This is the same > semantics as the atomic variables in the kernel. > > Since the current return value is void, we don't need to worry about > anything breaking due to this change: nobody relied on that, and only > users appearing from now on will be checking this value. > > Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx> > Reviewed-by: Michal Hocko <mhocko@xxxxxxx> > Acked-by: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > CC: Johannes Weiner <hannes@xxxxxxxxxxx> > CC: Suleiman Souhlal <suleiman@xxxxxxxxxx> > CC: Tejun Heo <tj@xxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>