Re: [RFC PATCH 1/2] netpoll: Remove dead netpoll_rx code

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From: ebiederm@xxxxxxxxxxxx (Eric W. Biederman)
Date: Tue, 11 Mar 2014 13:48:01 -0700

> To play devil's advocate to my own patch.  Does anyone know where kgdb
> over network (kgdboe) code lives today?
> 
> What little I could find in a quick google search strongly suggests that
> kgdboe was abandoned in 2010 or so.
> 
> I am trying to figure out if there are any active out of tree projects
> that need by directional netpoll.

Good questions.

I, perhaps mistakenly, kept the functionality around because there
were claims that we'd use it in-tree.

That of course never materialized.

The fact that people have a lot of trouble even finding the kgdboe
sources is quite telling, indeed.

Let's kill it, we can pull it back in (perhaps with a better design)
if something is proposed in-tree that will need it.

But I'm skeptical we ever will need it, and even if such a
reinstatement is proposed f.e. for the kgdboe use case it has holes.

Consider the case where kgdboe takes a breakpoint in a hardware
interrupt handler.  What happens?  We cannot allow it to perform a
full back-and-forth conversation with the remote gdb from such a
context.
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