On Thu, Oct 13, 2011 at 12:09:28PM +0100, Russell King - ARM Linux wrote:
> On Mon, Oct 10, 2011 at 02:02:09PM +0100, Marc Zyngier wrote:
> > On 07/10/11 16:16, Will Deacon wrote:
> > > On Fri, Oct 07, 2011 at 10:44:59AM +0100, Marc Zyngier wrote:
> > >> +static void __cpuinit exynos4_secondary_init(unsigned int cpu)
> > >> {
> > >> void __iomem *dist_base = S5P_VA_GIC_DIST +
> > >> - (gic_bank_offset * smp_processor_id());
> > >> + (gic_bank_offset *
> > >> cpu_logical_map(cpu));
> > >
> > > Again, I'm deeply suspicious of this code :) Is there not a common memory
> > > alias for the distributor across all of the CPUs?
> >
> > Kukjin, could you please comment on the presence of a common memory
> > region for the distributor? This seem quite odd...
>
> It's not odd when you consider that there's per-CPU registers within the
> GIC distributor as well (for the first 32 GIC IRQs) as the per-CPU GIC
> CPU interfaces.
Agreed, but it is odd for those registers not to be banked in hardware. Marc
and I spoke to some of the hardware chaps at ARM and they don't see this as
a common setup in the future, so rather than litter the GIC driver with
__percpu variables, we might be better off adding some extra platform callbacks
to the set that we already have.
Will
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