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

David Howells
2016-04-07T20:42:39Z

Joe Perches <joe@perches.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