[PATCH] print kdump kernel loaded status in stack dump

[Petr Tesarik]

On Fri, 19 Jan 2018 12:47:19 +0800
Dave Young <dyoung at redhat.com> wrote:

> On 01/18/18 at 01:57pm, Steven Rostedt wrote:
> > On Thu, 18 Jan 2018 10:02:17 -0800
> > Andi Kleen <ak at linux.intel.com> wrote:
> >   
> > > Dave Young <dyoung at redhat.com> writes:  
> > > >  		printk("%sHardware name: %s\n",
> > > >  		       log_lvl, dump_stack_arch_desc_str);
> > > > +	if (kexec_crash_loaded())
> > > > +		printk("%skdump kernel loaded\n", log_lvl);    
> > > 
> > > Oops/warnings are getting longer and longer, often scrolling away
> > > from the screen, and if the kernel crashes backscroll does not work
> > > anymore, so precious information is lost.
> > > 
> > > Can you merge it with some other line?
> > > 
> > > Just a [KDUMP] or so somewhere should be good enough.  
> > 
> > Or perhaps we should add it as a TAINT. Not all taints are bad.  
> 
> Hmm, I also thought about this before but It sounds like not match the
> "tainted" meaning with the assumption that it is bad :(

Not only that. Once set, taint flags are not supposed to go away, but
it is perfectly fine to unload a panic kernel.

Petr T