Hello, Peter.
On Mon, Jun 29, 2015 at 11:32:19AM +0200, Peter Zijlstra wrote:
> Agreed, luckily we already have the infrastructure for this, something
> like so?
>
> --- a/include/linux/percpu-defs.h
> +++ b/include/linux/percpu-defs.h
> @@ -287,6 +287,16 @@ do {
> \
> preempt_enable(); \
> } while (0)
>
> +#define per_cpu_sum(var) \
> +({ \
> + typeof(var) __sum = 0; \
> + int cpu; \
Why not __cpu?
> + compiletime_assert_atomic_type(__sum); \
> + for_each_possible_cpu(cpu) \
> + __sum += per_cpu(var, cpu); \
> + __sum; \
> +})
But other than that, looks good to me.
Thanks.
--
tejun
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