These pernet_operations create per-net pktgen threads
and /proc entries. These pernet subsys looks closed
in itself, and there are no pernet_operations outside
this file, which are interested in the threads.
Init and/or exit methods look safe to be executed
in parallel.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 net/core/pktgen.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index b8ab5c829511..d81bddd1bb80 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3851,6 +3851,7 @@ static struct pernet_operations pg_net_ops = {
        .exit = pg_net_exit,
        .id   = &pg_net_id,
        .size = sizeof(struct pktgen_net),
+       .async = true,
 };
 
 static int __init pg_init(void)

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