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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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