The condition on CONFIG_NF_CONNTRACK_LABELS being removed by
this patch guards compilation of non-trivial implementations
of ctnetlink_dump_labels() and ctnetlink_label_size().
However, this is not necessary as each of these functions
will always return 0 if CONFIG_NF_CONNTRACK_LABELS is not defined
as each function starts with the equivalent of:
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
if (!labels)
return 0;
And nf_ct_labels_find always returns NULL if CONFIG_NF_CONNTRACK_LABELS
is not enabled. So I believe that the compiler optimises the code away
in such cases anyway.
Some advantages of this approach are:
1. Fewer #ifdefs, fewer headaches
2. The trivial implementations can be dropped
3. A follow-up patch, to conditionally compile ctnetlink_label_size
only when it is used becomes simpler (see point 1)
Found by inspection.
Compile tested only.
Signed-off-by: Simon Horman <horms@xxxxxxxxxx>
---
net/netfilter/nf_conntrack_netlink.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 123e2e933e9b..f1f7dff08953 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -382,7 +382,6 @@ static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
#define ctnetlink_dump_secctx(a, b) (0)
#endif
-#ifdef CONFIG_NF_CONNTRACK_LABELS
static inline int ctnetlink_label_size(const struct nf_conn *ct)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
@@ -411,10 +410,6 @@ ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
return 0;
}
-#else
-#define ctnetlink_dump_labels(a, b) (0)
-#define ctnetlink_label_size(a) (0)
-#endif
#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
--
2.45.2
