linux-kernel - Re: [PATCH 2/9] rxrpc: Disable a debugging statement that has been left enabled.

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Message-ID: <5417.1460061754@warthog.procyon.org.uk>
Date:	Thu, 07 Apr 2016 21:42:34 +0100
From:	David Howells <dhowells@...hat.com>
To:	Joe Perches <joe@...ches.com>
Cc:	dhowells@...hat.com, linux-afs@...ts.infradead.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] rxrpc: Disable a debugging statement that has been left enabled.

Joe Perches <joe@...ches.com> wrote:

> > Let's see...  If the machine panics whilst I'm developing stuff (quite
> > likely if something goes wrong in BH context), how do I get at the
> > function tracing log to find out why it panicked if the log is then
> > lost?  With the serial console, at least I automatically capture the
> > output of kenter and co..
> 
> But you also don't get a bunch of other useful stuff.
> 
> btw: there is ftrace_dump_on_oops
> 
> https://lwn.net/Articles/366796/

Cute.

How do I get at the argument values and suchlike that kenter() and co print?
I presume I would need to replace any kenter() or suchlike that printed more
than just the address with a tracing hook?

David