+static void stat_dec(u32 *v)
+{
+ *v = *v - 1;
+}
+
+static void stat64_inc(struct ramzswap *rzs, u64 *v)
+{
+ spin_lock(&rzs->stat64_lock);
+ *v = *v + 1;
+ spin_unlock(&rzs->stat64_lock);
+}
+
+static void stat64_dec(struct ramzswap *rzs, u64 *v)
+{
+ spin_lock(&rzs->stat64_lock);
+ *v = *v - 1;
+ spin_unlock(&rzs->stat64_lock);
+}
+
+static u64 stat64_read(struct ramzswap *rzs, u64 *v)
+{
+ u64 val;
+
+ spin_lock(&rzs->stat64_lock);
+ val = *v;
+ spin_unlock(&rzs->stat64_lock);
+
+ return val;
+}
+#else
+#define stat_inc(v)
+#define stat_dec(v)
+#define stat64_inc(r, v)
+#define stat64_dec(r, v)
+#define stat64_read(r, v)
+#endif /* CONFIG_RAMZSWAP_STATS */