[PATCH 24/34] mm: sum_cpu_var.patch

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

From: Peter Zijlstra <a.p.zijlstra@chello.nl>

Much used per_cpu op by the additional policies.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>

---

 include/linux/percpu.h |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6/include/linux/percpu.h
===================================================================
--- linux-2.6.orig/include/linux/percpu.h	2006-03-13 20:38:20.000000000 +0100
+++ linux-2.6/include/linux/percpu.h	2006-03-13 20:45:24.000000000 +0100
@@ -15,6 +15,11 @@
 #define get_cpu_var(var) (*({ preempt_disable(); &__get_cpu_var(var); }))
 #define put_cpu_var(var) preempt_enable()
 
+#define __sum_cpu_var(type, var) ({ __typeof__(type) sum = 0; \
+                                 int cpu; \
+                                 for_each_cpu(cpu) sum += per_cpu(var, cpu); \
+                                 sum; })
+
 #ifdef CONFIG_SMP
 
 struct percpu_data {
-
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