The bluetooth code needs this function. It was introduced in upstream
commit b4772ef87.

Signed-off-by: Hauke Mehrtens <ha...@hauke-m.de>
---
 backport/backport-include/net/sock.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backport/backport-include/net/sock.h 
b/backport/backport-include/net/sock.h
index ec67b9e..1a0a415 100644
--- a/backport/backport-include/net/sock.h
+++ b/backport/backport-include/net/sock.h
@@ -38,4 +38,9 @@
 #define SOCK_SELECT_ERR_QUEUE (SOCK_QUEUE_SHRUNK + 14)
 #endif
 
+#ifndef sock_skb_cb_check_size
+#define sock_skb_cb_check_size(size) \
+       BUILD_BUG_ON((size) > FIELD_SIZEOF(struct sk_buff, cb))
+#endif
+
 #endif /* __BACKPORT_NET_SOCK_H */
-- 
1.9.1

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