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    Subject[PATCH 08/23] lib: percpu_count_sum()
    Provide an accurate version of percpu_counter_read.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    include/linux/percpu_counter.h | 18 +++++++++++++++++-
    lib/percpu_counter.c | 6 +++---
    2 files changed, 20 insertions(+), 4 deletions(-)

    Index: linux-2.6/include/linux/percpu_counter.h
    ===================================================================
    --- linux-2.6.orig/include/linux/percpu_counter.h
    +++ linux-2.6/include/linux/percpu_counter.h
    @@ -34,13 +34,24 @@ void percpu_counter_init(struct percpu_c
    void percpu_counter_destroy(struct percpu_counter *fbc);
    void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
    void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
    -s64 percpu_counter_sum_positive(struct percpu_counter *fbc);
    +s64 __percpu_counter_sum(struct percpu_counter *fbc);

    static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
    {
    __percpu_counter_add(fbc, amount, FBC_BATCH);
    }

    +static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
    +{
    + s64 ret = __percpu_counter_sum(fbc);
    + return ret < 0 ? 0 : ret;
    +}
    +
    +static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
    +{
    + return __percpu_counter_sum(fbc);
    +}
    +
    static inline s64 percpu_counter_read(struct percpu_counter *fbc)
    {
    return fbc->count;
    @@ -107,6 +118,11 @@ static inline s64 percpu_counter_sum_pos
    return percpu_counter_read_positive(fbc);
    }

    +static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
    +{
    + return percpu_counter_read(fbc);
    +}
    +
    #endif /* CONFIG_SMP */

    static inline void percpu_counter_inc(struct percpu_counter *fbc)
    Index: linux-2.6/lib/percpu_counter.c
    ===================================================================
    --- linux-2.6.orig/lib/percpu_counter.c
    +++ linux-2.6/lib/percpu_counter.c
    @@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add);
    * Add up all the per-cpu counts, return the result. This is a more accurate
    * but much slower version of percpu_counter_read_positive()
    */
    -s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
    +s64 __percpu_counter_sum(struct percpu_counter *fbc)
    {
    s64 ret;
    int cpu;
    @@ -64,9 +64,9 @@ s64 percpu_counter_sum_positive(struct p
    ret += *pcount;
    }
    spin_unlock(&fbc->lock);
    - return ret < 0 ? 0 : ret;
    + return ret;
    }
    -EXPORT_SYMBOL(percpu_counter_sum_positive);
    +EXPORT_SYMBOL(__percpu_counter_sum);

    void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
    {
    --

    -
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