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Code Issues Releases Wiki Activity

[VLAN]: Avoid expensive divides 

We can avoid divides (as seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y on
x86) changing vlan_group_get_device()/vlan_group_set_device() id
parameter from signed to unsigned.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-01-08 23:54:43 -08:00 committed by David S. Miller
parent 4cec72c890
commit f0b5a0dcf1
1 changed files with 4 additions and 2 deletions
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6
include/linux/if_vlan.h
View File

@ -81,14 +81,16 @@ struct vlan_group {
struct rcu_head rcu;
};
static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, int vlan_id)
static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
unsigned int vlan_id)
{
struct net_device **array;
array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
}
static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id,
static inline void vlan_group_set_device(struct vlan_group *vg,
unsigned int vlan_id,
struct net_device *dev)
{
struct net_device **array;