[TCP]: Comment fastpath_cnt_hint off-by-one trap

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

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index f8cf090e8f49..9ff456e8d6c7 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -343,7 +343,8 @@ struct tcp_sock {
         struct sk_buff *forward_skb_hint;
         struct sk_buff *fastpath_skb_hint;
 
-        int     fastpath_cnt_hint;
+        int     fastpath_cnt_hint;      /* Lags behind by current skb's pcount
+                                         * compared to respective fackets_out */
         int     lost_cnt_hint;
         int     retransmit_cnt_hint;