diff -r 63c5e25ba2a6 sys/sys/pcpu.h
--- a/sys/sys/pcpu.h	Tue Jul 06 19:43:40 2010 +0000
+++ b/sys/sys/pcpu.h	Fri Jul 09 13:06:47 2010 +1000
@@ -109,7 +109,19 @@
 /*
  * Utility macros.
  */
-#define	DPCPU_SUM(n, var) __extension__					\
+#define	DPCPU_SUM(n) __extension__					\
+({									\
+	u_int _i;							\
+	__typeof(DPCPU_PTR(n)) sum;					\
+									\
+	sum = 0;							\
+	CPU_FOREACH(_i) {						\
+		sum += DPCPU_ID_PTR(_i, n);				\
+	}								\
+	sum;								\
+})
+
+#define	DPCPU_MEMBERSUM(n, var) __extension__				\
 ({									\
 	u_int _i;							\
 	__typeof((DPCPU_PTR(n))->var) sum;				\
@@ -121,6 +133,24 @@
 	sum;								\
 })
 
+#define	DPCPU_ZERO(n, size)						\
+{									\
+	u_int _i;							\
+									\
+	CPU_FOREACH(_i) {						\
+		bzero(DPCPU_ID_PTR(_i, n), size);			\
+	}								\
+}
+
+#define	DPCPU_MEMBERZERO(n, var, size)					\
+{									\
+	u_int _i;							\
+									\
+	CPU_FOREACH(_i) {						\
+		bzero(DPCPU_ID_PTR(_i, n)->var, size);			\
+	}								\
+}
+
 /* 
  * XXXUPS remove as soon as we have per cpu variable
  * linker sets and can define rm_queue in _rm_lock.h