enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/fs/btrfs/rcu-string.h
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@@ -8,7 +8,7 @@
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 struct rcu_string {
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 	struct rcu_head rcu;
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-	char str[0];
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+	char str[];
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 };
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 static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)