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Subject[PATCH 04/15] lib: percpu_counter_set
Provide a method to set a percpu counter to a specified value.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
include/linux/percpu_counter.h | 6 ++++++
lib/percpu_counter.c | 13 +++++++++++++
2 files changed, 19 insertions(+)
Index: linux-2.6/include/linux/percpu_counter.h
===================================================================
--- linux-2.6.orig/include/linux/percpu_counter.h 2007-05-02 12:44:13.000000000 +0200
+++ linux-2.6/include/linux/percpu_counter.h 2007-05-02 19:06:44.000000000 +0200
@@ -38,6 +38,7 @@ static inline void percpu_counter_destro
free_percpu(fbc->counters);
}

+void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
void __percpu_counter_mod(struct percpu_counter *fbc, s32 amount, s32 batch);
void __percpu_counter_mod64(struct percpu_counter *fbc, s64 amount, s32 batch);
s64 percpu_counter_sum(struct percpu_counter *fbc);
@@ -87,6 +88,11 @@ static inline void percpu_counter_destro
{
}

+static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
+{
+ fbc->count = amount;
+}
+
#define __percpu_counter_mod(fbc, amount, batch) \
percpu_counter_mod(fbc, amount)

Index: linux-2.6/lib/percpu_counter.c
===================================================================
--- linux-2.6.orig/lib/percpu_counter.c 2007-05-02 12:44:13.000000000 +0200
+++ linux-2.6/lib/percpu_counter.c 2007-05-02 19:08:12.000000000 +0200
@@ -5,6 +5,19 @@
#include <linux/percpu_counter.h>
#include <linux/module.h>

+void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
+{
+ int cpu;
+
+ spin_lock(&fbc->lock);
+ for_each_possible_cpu(cpu) {
+ s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
+ *pcount = 0;
+ }
+ fbc->count = amount;
+ spin_unlock(&fbc->lock);
+}
+
void __percpu_counter_mod(struct percpu_counter *fbc, s32 amount, s32 batch)
{
long count;
--

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