[INET]: Avoid an integer divide in rt_garbage_collect()
Since 'goal' is a signed int, compiler may emit an integer divide
to compute goal/2.
Using a right shift is OK here and less expensive.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1cc6c23..933b093 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -851,14 +851,14 @@
equilibrium = ipv4_dst_ops.gc_thresh;
goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium;
if (goal > 0) {
- equilibrium += min_t(unsigned int, goal / 2, rt_hash_mask + 1);
+ equilibrium += min_t(unsigned int, goal >> 1, rt_hash_mask + 1);
goal = atomic_read(&ipv4_dst_ops.entries) - equilibrium;
}
} else {
/* We are in dangerous area. Try to reduce cache really
* aggressively.
*/
- goal = max_t(unsigned int, goal / 2, rt_hash_mask + 1);
+ goal = max_t(unsigned int, goal >> 1, rt_hash_mask + 1);
equilibrium = atomic_read(&ipv4_dst_ops.entries) - goal;
}