question about softirqs

[Benjamin Herrenschmidt]

> > The soft irq stuff is pretty much all generic code these days, except
> > for the code to switch to the softirq stack.
> 
> Grumble, when did that happen :-(
> 
> That's horrible for latency compared to handling it directly
> in the trap return path.

If it is indeed such a problem, it would be reasonably easy to
handle it in the return-to-userspace path around the same place
where we test for pending signals (isn't what we used to do
anyway ?)

Cheers,
Ben.