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[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>
This commit is contained in:
Eric Dumazet 2007-12-21 01:49:07 -08:00 committed by David S. Miller
parent 9cb5734e5b
commit b790cedd24
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/route.c
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@ -851,14 +851,14 @@ static int rt_garbage_collect(void)
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;
}