From: Jarek Poplawski <jarkao2@gmail.com>
Date: Tue, 26 May 2009 05:47:01 +0000 (-0700)
Subject: pkt_sched: gen_estimator: Fix signed integers right-shifts.
X-Git-Tag: firefly_0821_release~13604^2~364
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a1dcb6628b9489504a3be2515580fc4de891f94a;p=firefly-linux-kernel-4.4.55.git

pkt_sched: gen_estimator: Fix signed integers right-shifts.

Right-shifts of signed integers are implementation-defined so unportable.

With feedback from: Eric Dumazet <dada1@cosmosbay.com>

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 6d62d4618cfc..78e5bfc454ae 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -128,12 +128,12 @@ static void est_timer(unsigned long arg)
 		npackets = e->bstats->packets;
 		brate = (nbytes - e->last_bytes)<<(7 - idx);
 		e->last_bytes = nbytes;
-		e->avbps += ((s64)(brate - e->avbps)) >> e->ewma_log;
+		e->avbps += (brate >> e->ewma_log) - (e->avbps >> e->ewma_log);
 		e->rate_est->bps = (e->avbps+0xF)>>5;
 
 		rate = (npackets - e->last_packets)<<(12 - idx);
 		e->last_packets = npackets;
-		e->avpps += ((long)rate - (long)e->avpps) >> e->ewma_log;
+		e->avpps += (rate >> e->ewma_log) - (e->avpps >> e->ewma_log);
 		e->rate_est->pps = (e->avpps+0x1FF)>>10;
 skip:
 		read_unlock(&est_lock);