Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}

[Christoph Lameter]

On Tue, 28 Apr 2009, Paul E. McKenney wrote:

> > If you can show me have to pass a per-cpu variable (the variable,
> > not a dereference of it) as an argument to an inline function,
> > I'll implement this :-)
> >
> > It has to be dereferenced after local_bh_disable() for the
> > read side acquisition.
>
> The way I did this in treercu.c was to create an array of references
> to the per-CPU data in question.  Not necessarily recommended, but
> one way of doing it.  That said, one could argue that we should wait
> until we have at least three users before creating a generic primitive.

The new percpu allocator allows you to create a per cpu pointer and pass
it to functions.

per_cpu_ptr(pointer,cpu) is used to select an instance.
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