OOM notification for cgroupsv1 broken in 4.19

[Burt Holzman <burt@xxxxxxxx>]

Hi,

This patch: 29ef680ae7c21110af8e6416d84d8a72fc147b14
[PATCH] memcg, oom: move out_of_memory back to the charge path

has broken the eventfd notification for cgroups-v1. This is because 
mem_cgroup_oom_notify() is called only in mem_cgroup_oom_synchronize and 
not with the new, additional call to mem_cgroup_out_of_memory in the 
charge path.

- B