netdev - Re: [RFC PATCH 1/2] netpoll: Remove dead netpoll

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Message-Id: <20140313.152311.1995854418463980325.davem@davemloft.net>
Date:	Thu, 13 Mar 2014 15:23:11 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	stephen@...workplumber.org, eric.dumazet@...il.com,
	netdev@...r.kernel.org, xiyou.wangcong@...il.com, mpm@...enic.com,
	satyam.sharma@...il.com
Subject: Re: [RFC PATCH 1/2] netpoll: Remove dead netpoll_rx code

From: ebiederm@...ssion.com (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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