Re: Calling current() from interrupt context

From: Kenn Humborg (
Date: Mon Oct 09 2000 - 03:37:15 EST

On Mon, Oct 09, 2000 at 03:54:21AM +0200, Andi Kleen wrote:
> On Mon, Oct 09, 2000 at 02:45:54AM +0100, Kenn Humborg wrote:
> > On Mon, Oct 09, 2000 at 02:21:09AM +0100, Kenn Humborg wrote:
> > > On Mon, Oct 09, 2000 at 02:20:27AM +0200, Andi Kleen wrote:
> > > > 2.4 TCP code relies on current being valid in a softirq.
> > >
> > > And what the hell does TCP need current for anyway?
> >
> > I think the only reference is in tcp_input.c, tcp_data_queue().
> > This does:
> [...]
> It is actually used in two places, in the fast path and there. It isn't
> as bad as it looks because it is only used in user context and could
> be fixed by putting a special flag into the sock for the execute
> in user context case (or just supply an argument that is passed around)
> The point was just that there are probably other users of current
> in interrupt context and AFAIK it works currently in all ports
> so you would need to fix these (mostly buggy) occurrences.

OK. I'm convinced. current will be valid in interrupt context.

> If you ever wanted to do a SMP VAX port you would also need to fix
> smp_processor_id().

No problem. I've already come up with a couple of ways of doing that.


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