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SubjectRe: [RFC][PATCH 05/13] percpu-rwsem: Optimize readers and reduce global impact
On Mon, Jun 29, 2015 at 11:12:20AM -0400, Tejun Heo wrote:
> 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?

I've no idea, __cpu is indeed more consistent, consider it changed.


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