Re: sleep before boot panic

[H. Peter Anvin]

Ingo Oeser wrote:
> On Monday 07 January 2008, Andi Kleen wrote:
> > Bernd Schubert <bernd-schubert@xxxxxx> writes:
> >
> > > Hi,
> > >
> > > I just switched to libata (pata) on my laptop and the immediate panic made it 
> > > impossible to figure out why my boot partition wasn't available.
> > > After applying this little patch I could check boot printk output and then saw 
> > > everything was properly recognized and only scsi-disk support was missing.
> > The correct fix would be to make scroll back (and sysrq) still work
> > after panic.  It's a little more complicated, but possible (essentially
> > it needs a polled keyboard handler)
>
> Customer: "This system could not find the root fs."
> Support: "Oh, yeah, just connect a (USB-) keyboard and scroll back."
>
> Hmm, device detection works after panic?
>
> I really like the "soft" panic better, where you still can operate the 
> kernel debugging features, but just have no user space supporting it.

Of course, if we'd been using kinit, "soft panic" would have been done 
exclusively in userspace...

	-hpa
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