write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/net/core/net_namespace.c
..
..
@@ -72,18 +72,6 @@
72
72
 
73
73
 DEFINE_COOKIE(net_cookie);
74
74
 
75
-u64 __net_gen_cookie(struct net *net)
76
-{
77
-	while (1) {
78
-		u64 res = atomic64_read(&net->net_cookie);
79
-
80
-		if (res)
81
-			return res;
82
-		res = gen_cookie_next(&net_cookie);
83
-		atomic64_cmpxchg(&net->net_cookie, 0, res);
84
-	}
85
-}
86
-
87
75
 static struct net_generic *net_alloc_generic(void)
88
76
 {
89
77
 	struct net_generic *ng;
..
..
@@ -155,12 +143,12 @@
155
143
 		return 0;
156
144
 
157
145
 	if (ops->id && ops->size) {
158
-cleanup:
159
146
 		ng = rcu_dereference_protected(net->gen,
160
147
 					       lockdep_is_held(&pernet_ops_rwsem));
161
148
 		ng->ptr[*ops->id] = NULL;
162
149
 	}
163
150
 
151
+cleanup:
164
152
 	kfree(data);
165
153
 
166
154
 out:
..
..
@@ -341,6 +329,9 @@
341
329
 	refcount_set(&net->count, 1);
342
330
 	refcount_set(&net->passive, 1);
343
331
 	get_random_bytes(&net->hash_mix, sizeof(u32));
332
+	preempt_disable();
333
+	atomic64_set(&net->net_cookie, gen_cookie_next(&net_cookie));
334
+	preempt_enable();
344
335
 	net->dev_base_seq = 1;
345
336
 	net->user_ns = user_ns;
346
337
 	idr_init(&net->netns_ids);
..
..
@@ -1127,10 +1118,6 @@
1127
1118
 		panic("Could not allocate generic netns");
1128
1119
 
1129
1120
 	rcu_assign_pointer(init_net.gen, ng);
1130
-
1131
-	preempt_disable();
1132
-	__net_gen_cookie(&init_net);
1133
-	preempt_enable();
1134
1121
 
1135
1122
 	down_write(&pernet_ops_rwsem);
1136
1123
 	if (setup_net(&init_net, &init_user_ns))