u64_stats: fix u64_stats_init() for lockdep when used repeatedly in one file

Fix bogus lockdep warnings if multiple u64_stats_sync variables are
initialized in the same file.

With CONFIG_LOCKDEP, seqcount_init() is a macro which declares:

	static struct lock_class_key __key;

Since u64_stats_init() is a function (albeit an inline one), all calls
within the same file end up using the same instance, effectively treating
them all as a single lock-class.

Fixes: 9464ca6 ("net: make u64_stats_init() a function")
Closes: https://lore.kernel.org/netdev/[email protected]/
Signed-off-by: Petr Tesarik <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: ptesarik

include/linux/u64_stats_sync.h

@@ -135,10 +135,11 @@ static inline void u64_stats_inc(u64_stats_t *p)
 	p->v++;
 }
 
-static inline void u64_stats_init(struct u64_stats_sync *syncp)
-{
-	seqcount_init(&syncp->seq);
-}
+#define u64_stats_init(syncp)				\
+	do {						\
+		struct u64_stats_sync *__s = (syncp);	\
+		seqcount_init(&__s->seq);		\
+	} while (0)
 
 static inline void __u64_stats_update_begin(struct u64_stats_sync *syncp)
 {