[TCP]: Left out sync->verify (the new meaning of it) & definify

Left_out was dropped a while ago, thus leaving verifying
consistency of the "left out" as only task for the function in
question. Thus make it's name more appropriate.

In addition, it is intentionally converted to #define instead
of static inline because the location of the invariant failure
is the most important thing to have if this ever triggers. I
think it would have been helpful e.g. in this case where the
location of the failure point had to be based on some quesswork:
    http://lkml.org/lkml/2007/5/2/464
...Luckily the guesswork seems to have proved to be correct.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 39d0df6afe47..7042c32085f5 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -758,10 +758,9 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
                             (tp->snd_cwnd >> 2)));
 }
 
-static inline void tcp_sync_left_out(struct tcp_sock *tp)
-{
-        BUG_ON(tp->rx_opt.sack_ok && (tcp_left_out(tp) > tp->packets_out));
-}
+/* Use define here intentionally to get BUG_ON location shown at the caller */
+#define tcp_verify_left_out(tp) \
+        BUG_ON(tp->rx_opt.sack_ok && (tcp_left_out(tp) > tp->packets_out))
 
 extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
 extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);