[PATCH] panic.c: export panic_on_oops

[Andrew Morton]

On Mon, 12 Oct 2009 08:36:38 -0700 (PDT) Linus Torvalds <torvalds at linux-foundation.org> wrote:

> I agree with the "save kernel buffer on panic" thing, but I disagree with 
> making it anything new, and hooking into "printk()" or the console 
> subsystem AT ALL. That's just bogus, stupid, and WRONG.
> 
> What you can do is to just flush the 'log_buf' buffer (or as much of it as 
> you want - the buffer may be a megabyte in size, and maybe you only want 
> to flush the last 8kB or something like that) on oops. And _not_ mix this 
> up with anything else.

What he said.  I did it that way in the Digeo kernel back in 2002. 
Worked good.  

Doing it via a console is rather weird.  It will need core kernel
changes to do it properly.

Perhaps oops_enter() is a good place to mark the start of the log, and
flush it within oops_exit().