On Thu, Jun 14, 2007 at 11:58:22PM +0200, Peter Zijlstra wrote:
> Provide an accurate version of percpu_counter_read.
>
> Should we go and replace the current use of percpu_counter_sum()
> with percpu_counter_sum_positive(), and call this new primitive
> percpu_counter_sum() instead?
>
> Signed-off-by: Peter Zijlstra <[email protected]>
> ---
> 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 2007-05-23 20:37:54.000000000 +0200
> +++ linux-2.6/include/linux/percpu_counter.h 2007-05-23 20:38:09.000000000 +0200
> @@ -35,7 +35,18 @@ void percpu_counter_destroy(struct percp
> 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);
> +s64 __percpu_counter_sum(struct percpu_counter *fbc);
> +
> +static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
> +{
> + s64 ret = __percpu_counter_sum(fbc);
> + return ret < 0 ? 0 : ret;
max(0, ret) maybe?
Josef 'Jeff' Sipek.
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