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xfrm: optimise the use of walk list header in xfrm_policy/state_walk 

The walk from input is the list header, and marked as dead, and will
be skipped in loop.

list_first_entry() can be used to return the true usable value from
walk if walk is not empty

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Li RongQing 2015-04-22 17:09:54 +08:00 committed by Steffen Klassert
parent 1ee5e6676b
commit 800777026e
2 changed files with 4 additions and 2 deletions
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4
net/xfrm/xfrm_policy.c
View File

@ -1004,7 +1004,9 @@ int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
if (list_empty(&walk->walk.all)) if (list_empty(&walk->walk.all))
x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all); x = list_first_entry(&net->xfrm.policy_all, struct xfrm_policy_walk_entry, all);
else else
x = list_entry(&walk->walk.all, struct xfrm_policy_walk_entry, all); x = list_first_entry(&walk->walk.all,
struct xfrm_policy_walk_entry, all);
list_for_each_entry_from(x, &net->xfrm.policy_all, all) { list_for_each_entry_from(x, &net->xfrm.policy_all, all) {
if (x->dead) if (x->dead)
continue; continue;

2
net/xfrm/xfrm_state.c
View File

@ -1626,7 +1626,7 @@ int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
if (list_empty(&walk->all)) if (list_empty(&walk->all))
x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all); x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
else else
x = list_entry(&walk->all, struct xfrm_state_walk, all); x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
list_for_each_entry_from(x, &net->xfrm.state_all, all) { list_for_each_entry_from(x, &net->xfrm.state_all, all) {
if (x->state == XFRM_STATE_DEAD) if (x->state == XFRM_STATE_DEAD)
continue; continue;