net: xfrm: xfrm_policy: silence compiler warning

Fix below compiler warning:

net/xfrm/xfrm_policy.c:1644:12: warning: ‘xfrm_dst_alloc_copy’ defined but not used [-Wunused-function]

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index b39044631b0c..e205c4b56afb 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1641,6 +1641,7 @@ free_dst:
         goto out;
 }
 
+#ifdef CONFIG_XFRM_SUB_POLICY
 static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
 {
         if (!*target) {
@@ -1652,6 +1653,7 @@ static int xfrm_dst_alloc_copy(void **target, const void *src, int size)
         memcpy(*target, src, size);
         return 0;
 }
+#endif
 
 static int xfrm_dst_update_parent(struct dst_entry *dst,
                                   const struct xfrm_selector *sel)