[PATCH net-next 7/7] tcp: cdg: use tcp high resolution clock cache

[Eric Dumazet]

We store in tcp socket a cache of most recent high resolution
clock, there is no need to call local_clock() again, since
this cache is good enough.

Signed-off-by: Eric Dumazet <eduma...@google.com>
---
 net/ipv4/tcp_cdg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_cdg.c b/net/ipv4/tcp_cdg.c
index 
06fbe102a425f28b43294925d8d13af4a13ec776..37eebd9103961be4731323cfb4d933b51954e802
 100644
--- a/net/ipv4/tcp_cdg.c
+++ b/net/ipv4/tcp_cdg.c
@@ -146,7 +146,7 @@ static void tcp_cdg_hystart_update(struct sock *sk)
                return;
 
        if (hystart_detect & HYSTART_ACK_TRAIN) {
-               u32 now_us = div_u64(local_clock(), NSEC_PER_USEC);
+               u32 now_us = tp->tcp_mstamp;
 
                if (ca->last_ack == 0 || !tcp_is_cwnd_limited(sk)) {
                        ca->last_ack = now_us;
-- 
2.19.0.605.g01d371f741-goog