From: Daniel Hellstrom <daniel@xxxxxxxxxxx>
Date: Mon, 02 May 2011 12:07:49 +0200
> I have made a new set of IPI patches, this time it includes patches
> for all SPARC32 architectures. It looks to me as if sun4d does not
> have a pending soft-IRQ register, so I handle it as a normal hard IRQ.
>
> I'm not sure if I should add a STBAR/memory barrier or a spinlock to
> the sun4d implementation of smp4d_ipi_{single,mask_one,resched}. I'm a
> bit worried that the memory write happens after the IPI is generated
> to the other CPUs. Also, I'm not sure that IRQ14 is the best choice
> for IPI, the best is probably of put it on a separate IRQ but I don't
> know if there are free IRQs.
>
> I hope that someone could try SMP on sun4m and sun4d with these
> patches.
I'm not going to hold these patches back, if we find bugs that
need to be fixed on sun4m/sun4d then we will simply fix them.
Thanks for fixing a problem we've had for such a long time.
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