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-rw-r--r--include/net/dst.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/net/dst.h b/include/net/dst.h
index 65a60fa..6c77879 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -61,6 +61,8 @@ struct dst_entry
struct hh_cache *hh;
#ifdef CONFIG_XFRM
struct xfrm_state *xfrm;
+#else
+ void *__pad1;
#endif
int (*input)(struct sk_buff*);
int (*output)(struct sk_buff*);
@@ -71,8 +73,20 @@ struct dst_entry
#ifdef CONFIG_NET_CLS_ROUTE
__u32 tclassid;
+#else
+ __u32 __pad2;
#endif
+
+ /*
+ * Align __refcnt to a 64 bytes alignment
+ * (L1_CACHE_SIZE would be too much)
+ */
+#ifdef CONFIG_64BIT
+ long __pad_to_align_refcnt[2];
+#else
+ long __pad_to_align_refcnt[1];
+#endif
/*
* __refcnt wants to be on a different cache line from
* input/output/ops or performance tanks badly
@@ -157,6 +171,11 @@ dst_metric_locked(struct dst_entry *dst, int metric)
static inline void dst_hold(struct dst_entry * dst)
{
+ /*
+ * If your kernel compilation stops here, please check
+ * __pad_to_align_refcnt declaration in struct dst_entry
+ */
+ BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
atomic_inc(&dst->__refcnt);
}